Chevy 350 Weak Spark

Weak signal reception can also be a result of a software anomaly. Incorrect Spark Plug Gap Spark plugs should be in good condition and gapped to factory specs. Check for such things as a stuck choke, a heavy or misadjusted carburetor float, a leaky needle valve in the carburetor, leaky injectors, low coil output or high resistance in the plug wires. The engine will appear to stumble for a brief period of time and then regain its pace. Still have weak spark even with the brand new coil and ignition module. There are many issues that can come from bad spark plugs. 3 Ohms primary resistance. If a normal spark occurs, then the problem is most likely not in the ignition system. go buy a new coil. Modern vehicles are equipped with a variety of electronic sensors and modules to control the various engine functions necessary for the vehicle to run. Have all plastic for them. By Tom Benford. Dead Battery? Maybe so. Holley® has been the undisputed leader in fuel systems for over 100 years. 89 GMC Sierra 2WD, 5. • Platinum-tipped original equipment spark plugs have a typical service. Fouled spark plugs can be a tip-off to this prob-lem. However, if installed in a 6-cylinder engine, all 6 plugs would require re-gapping. The spark plug gap adjustment should not be changed more than 3 times and should not exceed. Check for Spark. Replace with the correct heat range of Autolite spark plug. Chevy Forums FREE technical assistance for your restoration and repair. Ever wonder exactly what makes a marine spark plug a marine spark plug? There is a vast difference between spark plugs and it's most often measured in heat range. You may not have injector pulse signal, could be a distributor or the signal to it. I replaced the coil just in case the spark was weak. You get into the family buggy and try to start it. Removing the parts from the old engine and swapping them to the long block is much easier because of having ample room to work in. ? Vehicle is STOCK? the p0305 is a misfire #5 cylinder- 1) plugs* is there spark at #5 plug? how does plug look wet, dry, black, tan? 2) Injector- this is a spider system all inside manifold - TRY adding 'seafoam" or 'techron' a fuel cleaner, do a fuel pressure test and then KOEO observe pressure drop - drops Xpsi in. Ignition Troubleshooting: No Spark The ignition system is fairly easy to troubleshoot in the case of malfunction. I had a BB Chevy with an edelbrock manifold on it. If any one of these isn't there, you aren't going anywhere. The result of this will be hard starting, reduced gas mileage and performance, running rich, fouled plugs and a lack of power. Chevy 350 5. There have been a lot of advances in ignition technology through the years. Installed engine and everything is. Chevrolet is prominently known in the automotive industry as a top-notch Auto Manufacturer. the wire from the the distributer goes to the neg side of coil. I only check one wire, I suppose it's always possible that the distributor contacts for some other wire have failed, but even if only a one or two of the spark plugs are getting spark, the engine should attempt to fire. Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder. hello all,, i have a Chevrolet 1500 Silvrado Z71 2003 with start problem, it will not crank at all,, battery good and took it to the dealer and started fin without any problems there, but some times it will not crank at all, but it will start if i keep try for 10 or more times!!!. See if you actually have a weak spark at the coil. Notice: Undefined index: HTTP_REFERER in /home/baeletrica/www/rwmryt/eanq. 2007 Chevy Avalanche 5. These firms have included long-established customers such as Ferrari, Alfa Romeo, Peugeot. If no spark, then the problem is coil or the wire to the points. Chevy 350 turns over but it will not start. Due to the different tip design, the gap of the spark plug has also changed. New spark plugs might be pre-gapped for a V-8 engine, allowing you to install all 8 plugs unchanged. This electric spark has to happen at exactly the right time or the engine will not run properly. GM Performance Parts designed our Fast Burn aluminum performance cylinder heads for small-block applications just like our Fast Burn 385 turn-key crate engine. 1985 chevy k10 pickup with a 305 carb. Jointly developed by Chevy and Buick, it is also referred to as the CBC (Chevrolet-Buick Combined) 350. Also caused by weak ignition system and/or rich fuel mixture. The result of this will be hard starting, reduced gas mileage and performance, running rich, fouled plugs and a lack of power. See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. Plug the spark plug on your ignition coil. 1994 Chevy Truck Won’t Start But Lots of Fuel at Throttle Body. Use a spark plug wrench with an extender. If, however, there is no spark or a weak spark, then further ignition system testing will have to be performed. You should get some kind of spark, although if you turn slowly the spark may be weak. I'm not up on the Chevy HEI stuff, can the coil weaken before it goes out? or is the weak spark (yellowish) because of the module?. The new engine is the exact same engine as the original. And when it comes to older cars and classics, well in many cases, they need even more maintenance, having at some point suffered from the ravages of neglect. PER NGK: “The operating temperature of a spark plug varies between 450-870°C. chevy 350 no spark Chevy 350 no spark I have changed the coil, cap, and rotor. Cost of diagnosing the P1351 CHEVROLET code. There are 6 major components that work together to produce spark, if any of these is defective, spark will be lost. hello all,, i have a Chevrolet 1500 Silvrado Z71 2003 with start problem, it will not crank at all,, battery good and took it to the dealer and started fin without any problems there, but some times it will not crank at all, but it will start if i keep try for 10 or more times!!!. On newer vehicles, a coil pack replaces the distributor. There was a crack in the intake, leaning out that side of the manifold enough to misfire. My thoughts were the module too, and if you take yours to the auto parts store and tell them 70's-80's Chevy V8 and show them yours to compare, you might be able to find a match. Find CHEVROLET 5. I am out of ideas thank you for your help. • Spark plugs should be inspected when an engine performance problem occurs and should be replaced regularly to ensure proper ignition system performance. The Chevy 216/235/261 Tuneup Guide As with all of the content on this website, you can simply click on any picture to get its largest size. Find 1948 Chevrolet Sedans for Sale on Oodle Classifieds. 1955-1996 Chevy Small-Block Performance Guide: Ignition System Manual (Part 8)- Includes Photos, Tips, Images, and How-To Instructions. For some scan tools enter VIN 10th "L" 3rd "C" 8th "K". He is saying that it has spark but it is weak after the intitial spark and then randomly has a good spark and will 'cough' a little, never enough to start it. Troubleshooting techniques fall into two categories, depending on the nature of the problem. I poured some gas down the carb and put several in the tank, still won't start, i pulled a plug and wire and grounded it, the spark is yellowish, i suspect a week coil pack or the module inside the distributor. LMC Truck® Truck Parts & Accessories for Chevy, GMC, Ford and Dodge Trucks and SUVs. engine cranks, no spark (SBC 350) Engine & Drivetrain. 1993 Chevy Silverado 1500 5. I used a test light at the points and the light flash's when the engine is cranking-so the distributor is good. Avoid the temptation to make your own. Chevy Spark EV; Chevy Bolt; Chevy Bolt (Owner Review) India’s Greenko Energy Raises $350 Million In Fresh Green Bond Issue These include exposure to financially weak off-takers and the. 1977 was defined by the Blazer, Suburban, C/K 10, C/K 20, C/K 30, LUV car lines. RE: Chevy 350 Small Block Hard to Start When Engine Is Hot? I have a 84' Camaro with a chevy 350 small block with a edelbrock carb, aluminum intake and stock mechanical pump. 7l misfires at high rpm and when its not warmed up yet? Spark plugs and / or wires. I was told the distributor is the problem, is this true? In order for any vehicle's ignition system to work smoothly, the engine distributor should be operating at maximum efficiency. Interestingly, unlike other Chevy small block designs, the Gen II engine was never available in any trucks manufactured by GM. 2007 Chevy Avalanche 5. The Chevy 216/235/261 Tuneup Guide As with all of the content on this website, you can simply click on any picture to get its largest size. 7L with no spark and no fuel (self. Checking The PassLock Anti-Theft System for Problems. 7L/350 Chevy small block Gen I Spark Plugs and get Free Shipping on Orders Over $99 at Summit Racing!. If a normal spark occurs, then the problem is most likely not in the ignition system. Ever wonder exactly what makes a marine spark plug a marine spark plug? There is a vast difference between spark plugs and it's most often measured in heat range. it starts up good but has a dead miss on number 2. Adjust the #3 exhaust valve. This new distributor fits the SMALL BLOCK CHEVY 265-267-283-305-307-327-350-383-400 that are carbureted. the computer is all wired in like it was the last time we had it running and I have fuel spraying from the injectors. The spark plug gap adjustment should not be changed more than 3 times and should not exceed. If spark, then problem is bad points or condensor. Last night I actually held the spark plug wire in my hand while engine is cranking and I can feel a very weak spark but its not enough to fire a spark plug. 7L) userpete1037. My problem is the truck sparks every once in a while and when it does its real weak like a orange flame not blue. It's usually something simple. i am not running posi yet but went to. By Tom Benford. She drove it daily to work until about a year ago, when this problem developed. Platinum and iridium spark plugs have better longevity, their lifespan varies from 40,000 to 60,000 miles. 7L with no spark and no fuel (self. There was a crack in the intake, leaning out that side of the manifold enough to misfire. I change the oil every 2,500 miles, keep the ignition system updated (plugs, distributor cap, rotor, etc. starts and runs fine for another 20 mins. For sale 409 engines, 396 blocks heads engines, 427 block heads engines, 454 blocks heads engine and other parts for 1962-1972 Chevy big block muscle cars. currently the engine has ac delco cr43ts spark plugs and they tend to foul easily due to some oil burning and the engine running rich i was thinking about switching to r45ts ac delcos hoping they would burn off the excess fuel and oil i dont think this will hurt anything but any input would be appreciated this motor is getting weak and will be getting rebuilt soon just want to get. The already popular Chevrolet Street/Strip DUI is upgraded with new features for the ultimate Davis Unified Ignition package! First, we added the new Cross-Fire Cap which allows the plug wires to be neatly routed to each cylinder bank. Ford Distributors & Ignition Systems: Few things about an engine build seem more mysterious and magical than the ignition system. Jumper wire: Plain old 14 gauge primary wire. The Chevy Monza was born a looker, but its fatal curse was being born at the wrong time. Long Motor Corporation has over 30 years in business, and with over 30,000 truck parts in stock, we ship most orders complete within 24-48 business hours. Spark plugs, wires installing them ,when you get them on correctly you can feel the reponse power in your engine it will be pulling up hills no problem basically get your spark loud wires adjusted its all about your efforts in adjusting things after groove is in stalled for best results ]]> Carbureted Vehicles Thu, 23 Feb 2017 22:57:09 -0600. Chevrolet Equinox replacement car remotes and remote covers for less. I am out of ideas thank you for your help. Ignition Systems Cheat Sheet for the Chevy Small Block For our budget-oriented purposes we find that conceptually at least, GM's HEI distributor is a near ideal choice in terms of practicality. Also please check out the statistics and reliability analysis of Chevrolet Silverado 1500 based on all problems reported for the Silverado 1500. Adjust the #2 intake valve: Adjust the #4 exhaust valve: Adjust the #8 exhaust valve. Since I didn’t see a grounding problem or problem with the voltage source for the coil, I suspected a weak coil. Turning dist. In the great majority of cases the unit checks out fine indicating there is something amiss with the vehicle. A bad module usually causes no spark. A shorter spark line would indicate a weak spark possibly due to a lean fuel condition (dirty injectors or vacuum leaks) or low compression (burned exhaust valve or bad head gasket). 1979 Corvette engines have the last six digits of the VIN stamped on the block after the engine number. I had the spark plugs and wires replaced last month and the shop used the more expensive heat resistance spark plug wires. Replace HEI distributor and no start. I don't have a compression gauge, so that's why I don't have a reading, but I'll get it measured as soon as I can. 1 cylinder at the front. With William Durant and Louis Chevrolet's design, they were able to start up with a design as preliminary introduction to the public. engine cranks, no spark (SBC 350) Engine & Drivetrain. Weak spark on HEI ( yellowish spark) - Chevy Message Forum - Restoration and Repair Help. 1968 Chevrolet C10 is a Modernized Show Truck Chevrolet C10 features a 525 horsepower crate engine, a track-ready suspension setup and a custom chassis. 1995 chevy 3500 with a 7. Produces strong, blue spark at the plugs. The test you described with pulling off the spark plug wires off one at a time to see how the engine behaves is a general misfire test. Also, the spark plug gap should never exceed. It started with the engine light being on for a while, with a slightly rough idle but otherwise ran great. I ran a 12volt jumper from battery to the coil and still no spark. GM Performance Parts designed our Fast Burn aluminum performance cylinder heads for small-block applications just like our Fast Burn 385 turn-key crate engine. There are 6 major components that work together to produce spark, if any of these is defective, spark will be lost. Any idea's?. Modern vehicles are equipped with a variety of electronic sensors and modules to control the various engine functions necessary for the vehicle to run. The truck has 135,000 miles on it, but has never given me any problem. It depends on the type of spark plug and materials it is made from. Fuel fouled spark plug Black fluffy carbon deposits indicate an overly rich fuel mixture or possibly a weak spark. Early Chevy engines should only be using low resistance metallic solid core spark plug wires. If no spark, remove the wire from the points and manually "spark" it to ground. Under normal use, the battery in your remote keyless entry transmitter should last about four years. Chevrolet Impala Engine Problems. 3 Causes of Engine Knock November 7, 2013 Basically, engine knock (also known as pinging, detonation and spark knock) occurs when the air/fuel mixture inside a cylinder is incorrect, which makes the fuel burn unevenly. 7 V8 New Engine Won't Start 8 Answers. Tried new distributor and new crank sensor. It had taken Chevrolet 15 years to build the first 250,000 Corvettes, but only an additional eight years to build 250,000 more. While ignition coils are generally very sturdy and reliable, over. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. 1 cylinder at the front. no spark to the plugs from the distributor but spark to distributor The 1988 1998 GMT400 Chevy & GMC Pickups Message Either your spark is very weak at the. Check for fuel system problems, or fouled spark plugs. Plug the spark plug on your ignition coil. walk to pub have a beer and let it cool down. Some simple regular maintenance will save you a lot of money in the long run. Computer, Ignition, & Fuel Systems - i'm a newbie and with a weak spark on 99 silverado 1500 4. If you get an 1/8" or so of spark, that should be enough to fire. Also, the spark plug gap should never exceed. There was a crack in the intake, leaning out that side of the manifold enough to misfire. White plugs are telling you it's lean. Sadly he lost control of his truck and it rolled. Although, it is a good practice to check your spark plug for the most common problems. 110, 125m and 185s, as is the 110 runs and the 185s runs and smokes and has an electric start. The 350 small block engine first appeared as a high-performance V-8 option for the 1967 Chevy Camaro. A vacuum leak would be indicated by a low reading of say 5 inches of mercury. It gave absolutely no indication of problems until that moment, good oil pressure, smooth running and decent power for an engine with 115K on it. 4 fits 1103952: Distributors - Amazon. Find your perfect car with Edmunds expert reviews, car comparisons, and pricing tools. 7 AT Newly installed GM crate OEM motor 2 mos ago New Optima yellow top battery Alternator and starter are new New plugs, Taylor 8. What you found is not necessarily a weak spark. A bad module usually causes no spark. Diagnostic trouble codes may be cleared by disconnecting the battery ground cable for at least 20 seconds. Checking The PassLock Anti-Theft System for Problems. i have a tbi 350 out of a 90 suburban in my jeep. 3 Ohms primary resistance. go buy a new coil. What's interesting about this common ignition module failure is the way it goes out. Chevrolet Equinox replacement car remotes and remote covers for less. The engine basically runs fine with no audible knocking, and though it often 'smells' hot, the temp gauge stays low, barely reaching. And when it comes to older cars and classics, well in many cases, they need even more maintenance, having at some point suffered from the ravages of neglect. Them have someone try to start the car, if the plug sparks you have FIRE. The Chevrolet small-block engine is a series of automobile V8 engines built by the Chevrolet Division of General Motors using the same basic small (for a V8) engine block. 5 volts in "Key On" position and 11. But don't worry, the Chevrolet Certified Service experts have you covered. he has one of these inline things with a neon light and we can see at this stage there is no spark. Early Chevy engines should only be using low resistance metallic solid core spark plug wires. These firms have included long-established customers such as Ferrari, Alfa Romeo, Peugeot. the wire from the the distributer goes to the neg side of coil. Ford F-150 owners have reported 18 problems related to ignition coils failure (under the electrical system category). 040 in) when the spark plug is made. Ideal for HotSpark ignition kits or for use with points. If any one of these isn't there, you aren't going anywhere. I have tested all the spark plugs and the ignition coil and all of them are producing a spark. My dad owns a 1994 Buick Roadmaster with the de-tuned Corvette LT1 motor (260 horse power and 335 foot pounds of torque). Any auto parts store with have one. 045 1990 to 97 TBI engine uses AC-CR43TS plugs, gaped at. A narrow gap gives out a weak spark, and a wide gap may prevent a spark from getting fired. Sometime banging on the bottom of the fuel tank with a rubber hammer AS someone cranks the engine over can kick start a weak fuel pump. the engine will turn over 3 times and then spark. Early Chevy engines should only be using low resistance metallic solid core spark plug wires. How to Diagnose a Loss of Spark in Your Car Engine. com FREE DELIVERY possible on eligible purchases. This electric spark has to happen at exactly the right time or the engine will not run properly. Causes include worn, fouled or damaged spark plugs, bad plug wires or even a cracked distributor cap. Troubleshooting techniques fall into two categories, depending on the nature of the problem. I replaced it, and got a blue spark back, along with a much improved engine performance. I just thought of something else. White plugs are telling you it's lean. Its also possible you lost 1/2. Failing spark plug wires cause all these above issues and will ultimately clog your catalytic converter. Chevy Spark EV; Chevy Bolt; Chevy Bolt (Owner Review) India’s Greenko Energy Raises $350 Million In Fresh Green Bond Issue These include exposure to financially weak off-takers and the. Max-Fire® Ultra-Spark® performance spark plug wires are manufactured from highest quality materials to help deliver maximum voltage - ensuring the ultimate performance. 5 degrees BTDC, and 30 degree BTDC marks using a pencil in the #1 spark plug hole and high school geometry to calculate the distance of the arc for each angle on the pulley. This page is devoted to the evolution of this iconic car through each of the five model generations. 3L V8 FlexFuel Crew Cab Pickup. I was told the distributor is the problem, is this true? In order for any vehicle's ignition system to work smoothly, the engine distributor should be operating at maximum efficiency. GM Performance Parts designed our Fast Burn aluminum performance cylinder heads for small-block applications just like our Fast Burn 385 turn-key crate engine. Mini Muscle: 1978 Chevrolet Monza. More details about this are below. It is an electronically controlled pack of ignition coils regulated by the car's computer and is used to create the spark for each engine cylinder's spark plug. I have absolutely no spark. Although, it is a good practice to check your spark plug for the most common problems. Low Voltage and /or Bad Ground We occasionally get Ignitors sent back from customers as faulty. $900 obo pm me for more details Will consider splitting up open to Trades but don't waste my time with junk. Usuallly weak spark cause a misfire under a load,the compression increases when you open the throttle and can snuff out a weak spark --the cap and rotor can cause this even if they look perfect,but spark plug wires that are cracked,burnt from lying on an exhaust manifold or header will do the same,so can plugs that are fouled,or a weak ignition coil or pickup coil,sometimes the ignition module. Step to identify the root. There are 7 sections to look at including: STARTING SYSTEM, Cooling System, FUEL SYSTEM, ENGINE PARTS, OIL PUMP, TRANSMISSION and DRIVE LINE,. No Start Test 2: Checking for Fuel. I had it happen on my '94 GMC Sierra 3500 Xcab with a 350 SBC. Ignition Systems Cheat Sheet for the Chevy Small Block For our budget-oriented purposes we find that conceptually at least, GM's HEI distributor is a near ideal choice in terms of practicality. Being able to read a spark plug can be a valuable tuning aid. Produces strong, blue spark at the plugs. There are 6 major components that work together to produce spark, if any of these is defective, spark will be lost. July 4, 2016, 8:51pm #1. Ford F-150 owners have reported 18 problems related to ignition coils failure (under the electrical system category). There are many reasons why an engine won't start. 1955-1996 Chevy Small-Block Performance Guide: Ignition System Manual (Part 8)- Includes Photos, Tips, Images, and How-To Instructions. • Many spark plugs have a service life of over 20,000 miles (32,000 kilometers). How to check if a spark plug is firing without a test light? An alternative method to check if a spark plug is firing is to remove the spark plug from the engine. 7 NON Vortec engine and that when Vortec’s came out in 96 were all 5. Check the welds, and if you find any that are weak, look for another piece. My Engine Turns Over OK But It Won't Start If your engine won't crank or turn over, go HERE. By examining the center electrode color, an experienced engine tuner can determine a great deal about the engine’s overall operating condition. 5-12 volts in "Crank" position. Test the spark after engine is warm and under slight load. The 125m has weak spark and does not run. i change plugs and nothing happened. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. We’ve seen it in the movies, we’ve read it in books, and that’s just how it is. Furthermore, weak or corroded battery cables can contribute to the problem as well. If you have 12v there, then manually open the points and check for spark from the coil. We analyze 10 common myths regarding HEI (High Energy Ignitions) distributor system including ones regarding internal coils, billet housings, performance gains, vacuum advance, and plug wires. 1994 Chevy Truck Won't Start But Lots of Fuel at Throttle Body. they have a 63 amp alternator. Cam shaft sensor and Crank shaft sensor are both good. Timing compression new wiring in place carb is spitting out not in shooting fire up. Spark plug heat range is too cold and/or caused by extensive low-speed, short distance driving. Troubleshooting a faulty or inoperative ignition should always use a logical approach. if it is an older chevy,it could be weak vaccum to your timing. I have a 97 5. However, if installed in a 6-cylinder engine, all 6 plugs would require re-gapping. I am getting spark to the distributor but not to the spark plugs. Find out how to avoid the biggest engine-building mistakes and learning from experience, brought to you by Mustang & Fords Magazine. I ran a 12volt jumper from battery to the coil and still no spark. 7L) userpete1037. Weak valve springs if you suspect weak valve springs, rev the engine to say 4000 rpm and see if the needle swings back and forth rapidly. Chevrolet Volt: 2017 Motor Trend Car of the Year Contender The cramped accommodations and weak styling. Plug the spark plug on your ignition coil. the wire from the the distributer goes to the neg side of coil. 5 wires, new cap and rotor All was well after install Recently engine began stumbling and then just quit running Engine will crank but will not f. The already popular Chevrolet Street/Strip DUI is upgraded with new features for the ultimate Davis Unified Ignition package! First, we added the new Cross-Fire Cap which allows the plug wires to be neatly routed to each cylinder bank. Pre-ignition is caused when a spark plug is so hot, that it begins to glow and ignite the fuel-air mixture prematurely, before the spark. GM Performance Parts designed our Fast Burn aluminum performance cylinder heads for small-block applications just like our Fast Burn 385 turn-key crate engine. the throttle body is dumping fuel into the motor. Clearing Trouble Codes. ive checked all fuses and relaysI just cant figure it outand by no spark I mean anywhere coil plugs. I changed the coil and checked the rotor and cap, they look ok. It is stil possible that spatk is weak enough to not spark under compression in the engine. In 1939 Chevrolet launched its first cab-over-engine truck. The Blazer had very few feature changes this year except for a new grill and a soft-top for an additional charge. IGNITION TROUBLE SHOOTING - IG-106. However, it only ranks midpack in the large car class because of its run-of-the-mill cabin materials and underwhelming base engine. These have the fantastic platinum electrodes. Check yours to make sure they are the proper. So the basic symptoms are that spark while cranking is intermittent (wildly so), but the truck seems to run fine once started, and starts right up normally "when" it decides to. The 125m has weak spark and does not run. A vacuum leak would be indicated by a low reading of say 5 inches of mercury. White plugs are telling you it's lean. bustion chamber. The TH400 came in 2wd or 4wd Jeeps, coupled either to the popular Model 20 (or Model 21, in a few rare cases) transfer case or the Quadra-Trac, the latter being an option from 1973 to 1979. I don't have a compression gauge, so that's why I don't have a reading, but I'll get it measured as soon as I can. Easy to use parts catalog. By Tom Benford. 7 AT Newly installed GM crate OEM motor 2 mos ago New Optima yellow top battery Alternator and starter are new New plugs, Taylor 8. On newer vehicles, a coil pack replaces the distributor. If you did not see a spark, remove the coil wire from the distributor cap. If it's been a long time since you had a tune-up done last time, it's a good way to start; at least you will eliminate spark plugs and other tune-up items as a possible cause for misfiring. It is an electronically controlled pack of ignition coils regulated by the car's computer and is used to create the spark for each engine cylinder's spark plug. ) Running winter fuel in warm weather. I replaced it, and got a blue spark back, along with a much improved engine performance. My problem is the truck sparks every once in a while and when it does its real weak like a orange flame not blue. In looking down the throttle body while trying to start it, I could see a LOT of fuel being sprayed. Since every spark event has to fire across 2 spark plug electrodes, it’s imperative that all components be in top condition. I have an 84 Sierra with a small block 400 in it with HEI. CHEVYTHUNDER. go buy a new coil. The bad news is, I still don't know why its not starting I checked spark at plug #1 with a spark tester tool, it is getting spark at the plug. Overall, a weak—or lack of—spark due to a bad wire, or another failed ignition. Check for Spark. If your small block 350/305 chevy doesn't have spark like mine did this might be the problem. I only check one wire, I suppose it's always possible that the distributor contacts for some other wire have failed, but even if only a one or two of the spark plugs are getting spark, the engine should attempt to fire. Use a spark plug wrench with an extender. All of the burned plugs are black with soot and they all look the same. brad12 New Member. 5 wires, new cap and rotor All was well after install Recently engine began stumbling and then just quit running Engine will crank but will not f. Once you get the socket over the spark plug, place your hand over the head of the wrench, grasping the head firmly and pull the handle, hitting it gently with the palm of your hand to get it going. I’ve just taken it out of inside winter storage, and when I crank the engine it turns over very slowly. What You Need to Know About Engine Misfires. Assuming that checks out OK, what else should I try next? I have spark, and after repeated cranking the plug is moist with fuel, so I think I have spark, fuel, and compression, but it won't even sputter, nothing at all. 2002 SILVERADO 5. Our '83 class-C Chevy motorhome has a (CA emissions) 350 4BBL HD (heavy-duty service), no cat converter or ECM, basic HEI ignition. Spark plug gaps can hamper the performance of the engine. Remove a spark plug, connect it to the spark plug wire and graound the plug against the engine. 1970 C3 Corvette Overview. It is an electronically controlled pack of ignition coils regulated by the car's computer and is used to create the spark for each engine cylinder's spark plug. I have a 95 with the 5. New for 2015. For example, instead of getting spark everytime the engine turns over,. php(143) : runtime-created function(1) : eval()'d code(156) : runtime-created function(1. The date code the engine was manufactured was also cast into the block. 7L with no spark and no fuel (self.