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

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Old Jul 16, 2009 | 12:34 PM
  #21  
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alright guys, all test are done. Not a wiring issue, not the pcm. Just not getting signal to the ICM or the injectors so i am back to the OPTI. Does anyone know what to look for inside the opti because i am about to take it apart.
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Old Jul 16, 2009 | 12:37 PM
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Originally Posted by Formula96
alright guys, all test are done. Not a wiring issue, not the pcm. Just not getting signal to the ICM or the injectors so i am back to the OPTI. Does anyone know what to look for inside the opti because i am about to take it apart.
See if you can find somewhere to get the opti tested with an oscilloscope. I think it needs to be on the car though.
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Old Jul 16, 2009 | 02:12 PM
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Got a spare opti laying around? Plug it in to the opti harness, key ON and give it a spin. You should hear injectors click and get some spark.
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Old Jul 16, 2009 | 02:41 PM
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the only spare opti i have is the one that just came off of it, it makes its own clicks....
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Old Jul 16, 2009 | 02:43 PM
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and i still can't get thepartsladi to return my emails
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Old Jul 16, 2009 | 03:25 PM
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Originally Posted by Formula96
the only spare opti i have is the one that just came off of it, it makes its own clicks....
Still wouln't hurt, just for the sake of comparison.
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Old Jul 16, 2009 | 03:32 PM
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the reason i replaced in the first place was a no start no spark situation, i didn't do the noid test though.
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Old Jul 16, 2009 | 03:34 PM
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Originally Posted by Formula96
the reason i replaced in the first place was a no start no spark situation, i didn't do the noid test though.
So maybe your problem is not the opti if you still have the no start/no spark test after the new opti was installed.

I'm assuming all of the fuses checked out?
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Old Jul 16, 2009 | 03:43 PM
  #29  
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all fuses were checked, the only thing left that it can be is a bad opti, all wiring passed the test, pcm was swapped, coil is new, havn't replaced the ICM because of no signal going to it in the first place.

It has got to be a lemon opti...

o and i know the old opti was the original fault because i can hear pieces of it clicking around...
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Old Jul 16, 2009 | 03:50 PM
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Originally Posted by Formula96
all fuses were checked, the only thing left that it can be is a bad opti, all wiring passed the test, pcm was swapped, coil is new, havn't replaced the ICM because of no signal going to it in the first place.

It has got to be a lemon opti...

o and i know the old opti was the original fault because i can hear pieces of it clicking around...
Did you ohm out all the wires connecting the opti to the PCM?

I doubt that a NIB Delphi opti would be a dud.
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Old Jul 16, 2009 | 03:51 PM
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yes, all good
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Old Jul 16, 2009 | 03:52 PM
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Originally Posted by Formula96
yes, all good
Possible bad PCM ground?
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Old Jul 17, 2009 | 06:11 AM
  #33  
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new progress, same result, changed the opti for anouther NIB Delphi and same result, i have heard about this pcm ground but have not found it yet, anyone know exactly where to look for it?
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Old Jul 17, 2009 | 07:57 AM
  #34  
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I'd check the ignition switch honestly
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Old Jul 17, 2009 | 11:13 AM
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PCM ground
http://shbox.com/1/g103.jpg
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Old Jul 20, 2009 | 05:14 AM
  #36  
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all 4 PCM grounds are good.

Originally Posted by myltwon
I'd check the ignition switch honestly
what would i check?
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Old Jul 20, 2009 | 08:43 AM
  #37  
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i think i have found a solution...

http://www.eficonnection.com/24x/24x_Hardware.htm

now i just have to come up w/ $1500
I guess i could sell a brand new opti and brand new MSD coil for $300...
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Old Jul 21, 2009 | 11:28 AM
  #38  
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bump for fresh ideas (excluding EFI Connection changeover, i don't have $1500 dollors )
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Old Jul 21, 2009 | 11:54 AM
  #39  
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Ok status report:

Symptoms: No spark, no injector pulse

Replaced opti (2) - so problem is not the opti
Replaced opti harness
Swapped PCM's - no change
Checked fuses
Checked grounds

What year PCM did you swap in to test it?
Did you check the fuses visually or did you check them for continuity with your DVM?

Did you test the PCM power as well as ground? I want you to be sure that the PCM is actually on.
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Old Jul 21, 2009 | 12:12 PM
  #40  
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96 PCM swapped in, checked all fuses w/ dvom continuity and voltage KOEO, i did not check power to pcm, gives me something to do tonight...

THANKS, you have been a big help
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