LT1-LT4 Modifications 1993-97 Gen II Small Block V8

No saprk what to do

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Old 05-12-2009, 05:00 PM
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so i have a 6 month old ignition module and coil and i am not getting spark from the coil wat could it be or do i just need to replace the coil? 97 z28
Old 05-12-2009, 05:11 PM
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well before it even gets to your coil it goes trough the opti and the module. I cant give you to much help on how to check those but im sure someone will chime in to tell you how to check.
Old 05-12-2009, 05:15 PM
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Ignition Module would be the first thing i check, also i put in a new ignition mudule in mine and it lasted about 6 months.

Last edited by djjab57; 05-12-2009 at 05:48 PM.
Old 05-12-2009, 05:19 PM
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Originally Posted by finch97z
so i have a 6 month old ignition module and coil and i am not getting spark from the coil wat could it be or do i just need to replace the coil? 97 z28
Any codes?

How did you verify that you do not have spark at the coil?

The hi/lo res signals of the optical sensor of the opti (cam sensor) are sent to the PCM, the PCM sends a signal to the ICM which in turn triggers the coil to fire. Then the spark travels to the cap and rotor side of the opti and gets distributed to the proper cylinder.

I would check the grounds on the coil stud, should be three of them. Also check the ground from the stud to the chassis.

Swapping in a new coil would be a quick and easy test.
Old 05-12-2009, 05:21 PM
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ok they r under warranty so im gonna replace the coil and see what happens if that doesnt fix it then im lost but ill post again after that if it doesnt work thanks for the help
Old 05-12-2009, 05:49 PM
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I bought mine from AZ and it has a warrant
Old 05-12-2009, 09:29 PM
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changed coil and module still no spark wat to do never had this problem on any f body ive worked on. Help going nuts car has been done for little things for almost a month.
Old 05-13-2009, 07:17 AM
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drive it off a cliff, all your problems will be solved
Old 05-13-2009, 11:23 AM
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Originally Posted by finch97z
changed coil and module still no spark wat to do never had this problem on any f body ive worked on. Help going nuts car has been done for little things for almost a month.
What do you mean by you don't have spark? Does the engine turn over? Did you disconnect the coil wire from the opti to test for spark at the coil?
Any codes?
Try answering my questions please.
Old 05-13-2009, 11:51 AM
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the car trys to turn over, i get no spark from the coil, the only code im throwing is a high input on ignition which i have had for 7 months or so.
i am gonna try to see if im getting power to the module as soon as i can check it. and someone suggested the pcm being bad so i put a stock one in and it didnt change anything hope this helps.
Old 05-13-2009, 11:55 AM
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Originally Posted by finch97z
the car trys to turn over, i get no spark from the coil, the only code im throwing is a high input on ignition which i have had for 7 months or so.
i am gonna try to see if im getting power to the module as soon as i can check it. and someone suggested the pcm being bad so i put a stock one in and it didnt change anything hope this helps.
What is the exact code?

You say you've had the code for 7 months and your coil and ICM are 6 months old...hmm...sounds like that's your problem right there.
Old 05-13-2009, 01:55 PM
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P1351 ive had this code since i got my pcm from the tune and it has never really caused a problem but i never can seem to get rid of it.
Old 05-13-2009, 03:51 PM
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P1351 Ignition Control (IC) circuit high voltage (open circuit)

Sounds like the reason you are burning out your Coil & ICM...

Check the connections to the coil stud and the ground to the chassis like I mentioned earlier.
Old 05-13-2009, 06:18 PM
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i have done this b4 and ive researched this code no one has really found out what causes it. some things work on diff cars i have yet to find a way to get rid of it on mine the studs r ok and the ground is working properly.




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