Question about 1988 Pontiac Fiero

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Have an 88gt that has ran beautifully for years. All of the sudden, I have no spark. ICM right, nope just tried #3 1 gm, 2 auto zone. The problem seems intermitten. Power goes all the way up to the coil, but no spark out of the coil. Tried wire replacement from coil to distributor, new coil,has a new distributor, new rotor, still no spark. With key on voltage light blinks, not sure what that means, if anything. What else could it be, any advice will be appreciated

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Did you check grounding? Poor Grounding can lead to all sorts of electrical problems. Check motor to frame/body ground strap, battery to motor and battery to frame/body ground connections.

Posted on Jul 30, 2010

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Not if ignition module . Electronic componets when heated up will act just like that . When it dies check spark, fuel pressure right away an find out what quit . Test don't guess . Videos on youtube on testing GM ignition system. Which engine does yours have ? Had option of two different ones . 3.4 an 3.8L . Ignition module or cranhshaft position sensor could be the cause .
Three dual tower ignition coils are mounted to the ICM, and are serviced individually. The ICM performs the following functions:
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• The ICM inputs 18 X and 3 X reference signals to the PCM.
• The 3 X reference signal is also known as the low resolution engine speed signal. This signal is generated by the ICM using an internal divide-by-six circuit. This circuit divides the 18 X signal pulses by 6. This divider circuit will not begin operation without a sync pulse present at start-up, and without 18 X and 3 X reference signals no fuel injection will occur.

Pull plug wires off same coil when it dies , crank the engine , is there spark ? Ignition Control Modules ICM by Wells featuring Sgt Tech

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Thank you for using fixya and good luck.

http://gmcowners.com/gmc-forum/showthread.php?t=13770

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