Question about 1994 Chevrolet C1500

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Want to disable coil

I want to disable the coil, so I can run a compression check on a 1994 chevy c1500 with 5.7L v-8 engine.

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Unplug the power or the wires

Robert

Posted on Jan 22, 2009

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I received a check engine code indicating cyl 8 misfire. Replaced the common problem coil and no change. Spark plug is new. Engine run past 3000 RPM and starts to sputter. What can it be?


If you replaced the coil pack, plug wire, and injectors, then you have compression problem in clyinder 8, and your rings are bad, even though you may not see any smoke ...

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GM coilpacks are notorious for going bad. Start engine and one by one pull off spark plug boot from coil. You won't need to pull it completly off, just enough till you notice and idle change. You will also hear the sound of the spark jumping the gap you created. You may hear a click or pop noise over and over. If there is no idle change and popping noise when you remove that wire from the coil, then you have a dead post and will need to replace coil pack. If I remember correctly there are 3 coils that fire 2 cylinder each. Replaceing all 3 is generaly a wise decision. But you can get by with just the one that's faulty. Also those cars develop harmonic balancer issues; but they are rare. Lastly motor mounts will give you similar symptoms. Set the parking brake if it still works; or firmly apply foot brake, have an assistant do this while you watch the engine. The assistant with the brake firmly applied will start the engine and put the trans. Into reverse, the assistant will then quickly tap the gas pedal quickly. You watch the engines responce. It is supposed to move a little; but if that engine looks like it wants to jump out of the engine compartment you will need 1 or all mounts replaced. Repeat steps with trans. In drive if you did not notice excessive engine movement with it in reverse. If the engine appears to be in there securely then your mounts are fine. Both of these tests are easy to do.

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1994 ranger. 2.3 engine. 8plug model. Dead miss in number 2 cylinder. Changed the plugs, wires and coil pack. Still a dead miss. If the person I got the truck from broke the timing belt while the engine...


that engine is a non-interference engine, so it should not have been damaged when the timing belt failed-I'd check the injector and see if it has good compression in the cylinder, and if it is low, squirt oul in the cylinder and test again-if it picks up alot of compression after doing this, you have a bad/broken compression ring, if it does not pick up, it is a valve,

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4 Answers

Whats the correct way 2 perform a compression test on a chevy v8 small block


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1 Answer

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WET PLUD W/GOOD COMPRESSION IS USUALLY NO SPARK.YOUR ENGINE HAS 3 IGNITION COILS.EACH COIL CONTROLS 2 SPARK PLUGS.TRACE THE WIRES FROM THE BAD SPUGS BACK TO THE COILS .IF THEY ARE THE SAME COIL THEN U HAVE A BAD ONE OR CONTROL MODULE(UNDER COIL)

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I have a 1998 4.6 triton engine missing on #8 cylinder


Make sure your testing cylinder 8. Ford numbers their cylinders differently that others. #8 is the rear cylinder on the driver's side of the engine. The ignition coil may be putting out a weak spark. It should produce a spark capable of jumping a half inch gap from the coil terminal to the end of the plug wire. Next step without diagnostic tools is to swap fuel injectors with a good cylinder. After that check compression and compare with a good cylinder (hold gas pedal to fully depressed position before turning key to "on" to place computer in "clear flood" mode so engine won't run when checking compression).

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1 Answer

Low Vacuum


you might try having someone run a compression test on it it or something you can do easily . might be valves are leaking by some and you might be loosing compression. with that amount of miles very possable its getting there. thanks Jerry ..holler if you need more.

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