Cylinder #5 not sparking. - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-22-2004, 02:58 AM   #21
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the wrecker i go to will sell it to me for cheap hopefully, and off of an 86 Park Ave.
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Old 02-22-2004, 03:02 AM   #22
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86? Won't work for you bud. Mid-92 to present. Not the old Magnavox, either.
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Old 02-22-2004, 03:03 AM   #23
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Allan said it would work...i was just talkin to him about it...
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Old 02-22-2004, 03:15 AM   #24
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86? I wouldn't pay for anything that old. 86 will be the old Magnavox ignition like the early 92'* (unless it'* a single coil setup for the 5.0 V. The coils he just sold you (which you probably don't need) won't work on the ICM he'* telling you to buy.

I'm assuming Al doesn't fully understand your problem and troubleshooting up to this point, or he wouldn't have suggested coils.

If you MUST try an ICM, see if your wrecker will let you return one if it isn't the problem (which it probably is).

You're sure it'* only one cylinder, not two? If it'* the ICM or Coil, you're almost certainly missing on 2 cylinders.
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Old 02-22-2004, 03:23 AM   #25
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Matt, at this point, I would cancel my coil order if it'* not too late. Time to step back a bit from this one and look at it from a logical troubleshooting point of view.

1. Pull codes. If the ICM is faulty, it may have set a code.

2. You need to check all 6 cylinders for spark again. Use an old spark plug on each wire. Do NOT use your finger for this. We're talking 40,000 volts. Or pull the boot off each plug, and stick a screwdriver into the boot until it firmly contacts the clip for the head of the plug. Hold the screwdriver WAY down on the plastic handle. Now hold it near something metal, like the brackets for the engine hoist attached to your heads. VERY near. Have a buddy crank the engine. Watch for a spark to jump from the shaft of the screwdriver to the metal (ground).

3. If two are missing, do a FULL check of that coil, then SWAP that coil and see if the problem 'moves' with it. If it stays in the same spot, it'* probably the ICM. If it moves with the coil, it'* the coil. Make sense?

4. If it'* only one cylinder, you have a bad plug and/or wire, or a bad fuel injector.
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Old 02-22-2004, 04:02 AM   #26
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its one cylinder, ITS NOT THE WIRE OR PLUG i know that for sure, i pulled the wire and plug and there is nothing coming out of the Cylinder 5'* terminal on the second coil pack.
Ive been wanting to uprgrade to MSD for quite a while anyways, and i got one hell of a deal on it!
ugh why does this car have to treat me like ****!
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Old 02-22-2004, 04:32 AM   #27
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If it'* only ONE, it CANNOT be a coil or ICM. Don't waste your money! It MUST be a wire or plug. If you don't believe me, buy Chilton'* #28200. It'll show you how it works. It fires a PAIR of cylinders each time. Follow the troubleshooting steps above, or you may not find the problem.
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Old 02-22-2004, 04:52 AM   #28
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Unless half of the coil fell apart (can't happen) then it'* not your coils. The new coils won't get you anything but less reliability. Move the coil tha contains the #5 cylider, and move it to one of the other coil spots. I'm with willwren on this one.

The coils work by firing both wires attatched to them at the same time. If one'* out, the other ones out. Move the coil to a different location, and see what happens. Your ICM isn't doing cyl 5 anymore.
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Old 02-22-2004, 12:13 PM   #29
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Diagnosing a misfire on a DIS is easy. The coils fire 2 cylinders at at time. In actuality they fire on compression as well as exhaust. The exhaust firing obviously does nothing. If you have a misfire on 1 cylinder only, you have to look further down the line. an analytical approach is necessary. Start with the easiest and most obvious and do one thing at a time to rule it out. First, switch the spark plug with another cylinder (not the matching coil cylinder). If that is not the problem, switch a wire. (you can also check resistances in the plug and wire as well) Still inconclusive? Listen to the injector with a screwdriver on the injector and your ear. Compare the sound with a known good one. It should click. If it is stuck open then it will flood the cylinder. Does the oil smell like gas? Still not it? Check the compression in the cylinder. If it is below about 100-120 psi then you have a problem there.

This is a SOP (standard operating procedure) for checking an ignition system misfire on a DIS and I guarantee that this will find your problem.
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Old 02-22-2004, 01:25 PM   #30
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how can it be a wire, if im doing this test WITHOUT the spark plug wire connected to the terminal on the coil? theres no way, there is absolutly no spark comming off the terminal on the coil it self. Ill check into it again, but all i know is the plug and wire have nothing to do with it!
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