LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Ignition woes

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Old Aug 18, 2006 | 05:51 PM
  #1  
Blownbird355's Avatar
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Anyone want to take a look at my Datamaster logs?

I used this link to diagnose my no spark condition. I have good dc voltages at A and D 12.4. Then went on to the AC tes and the 4v ac is there sometimes but not always. Thats where I left off because of rain. I now need to trace all opti connections to see where my open is. New Caspers opti harness also. Could any of these 4 wires be culprit or is one more likely than the other?

http://shbox.com/1/4th_gen_tech2.html#opti_test

Last edited by Blownbird355; Aug 22, 2006 at 09:52 PM.
Old Aug 19, 2006 | 07:19 AM
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Re: Ignition woes

thanks for the help as always
Old Aug 19, 2006 | 12:39 PM
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Re: Ignition woes

Update car started but after awhile I got a code 41.
Old Aug 19, 2006 | 06:33 PM
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Re: Ignition woes

Apparently you saw the problem with the white wire going to the ICM dropping out the AC signal(DTC41). Check it to the black PCM connector pin 5.
Old Aug 20, 2006 | 07:54 AM
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Re: Ignition woes

Will do. I had the connector to the icm unplugged but I thought OBD I clears itself as soon as it see's what it wants. UNplugged connector to check voltages then plugged back in and rescanned and still had code. Car will start and run for so long then it will just die, but this is first time I got a code. I have also installed a racetronix fuel kit with there wiring. I confirmed I still had spark after car died. So its possible that its some goofy fuel problem, car dies than after 5-10 min will start again. Next thing to try is replacing the heatsink grease on the ICM and wire tracing.
Old Aug 21, 2006 | 05:20 PM
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Re: Ignition woes

ttt
Old Aug 22, 2006 | 09:53 PM
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Re: Ignition woes

ttt
Old Aug 26, 2006 | 08:06 AM
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Re: Ignition woes

thanks as always
Old Aug 26, 2006 | 09:23 AM
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Re: Ignition woes

Originally Posted by Blownbird355
thanks as always
Intermittents are most hard to troubleshoot. Keep testing and looking.
I know you are frustrated, but your "thanks" remark only makes your thread less likely to get any reply.
Old Aug 26, 2006 | 02:35 PM
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Re: Ignition woes

It seems that no matter what thread I start I never get any replies maybe I'm not a good starter.
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