LT1 No Start
Thread Starter
Teching In
Joined: Mar 2019
Posts: 39
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From: Dallas TX
LT1 No Start Recently I replaced my engine in my 1996 TA. Got it all back together and it ran for about 15 minutes. Parked it until the next day and now I can’t get it to start. What I have new on the car is below.
- opti
- Spark plugs
- fuel pressure regulator, pump, filter
- injectors
- wireset
- ICM
- RADIATOR
- Coolant temp sensors
Teching In
Joined: Feb 2019
Posts: 6
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Have you verified actual spark from the boot off with a spark tester? As well as check fuel pressure from the schrader valve itself vs just verifying hearing the pump and injectors? Air fuel and spark, gotta rule it out the basics. Is the car stock or modified in any way?
Teching In
Joined: Feb 2019
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Injectors shutting down sounds like a VATS problem... but with no light on that’s rather odd. do you know if someone or yourself has gone the “resistor” mod to bypass the VATS? It’s usually problematic compared to having a tuner just tune it out. Anyways, for troubleshooting, the PCM controls the ground for the injectors. You should have 12v at the pink wires with the key turned to the “on” position, then the PCM will ground the injector that will be firing. There is no ground wire running to the battery or engine from the injectors and you can’t have it always grounded out or it will be on 100% duty cycle.
Thread Starter
Teching In
Joined: Mar 2019
Posts: 39
Likes: 0
From: Dallas TX
Maybe I have had multiple issues, I ordered a new pcm, installed it today and now All injectors pass the Noid test. I checked to see if someone bypassed the security VATS system and all wires look to be oem. The car does have an alarm but it doesn’t connect to the security nor does it have remote start. I pulled the plugs and they were wet. I haven’t changed the ignition coil. Maybe I fouled out the plugs trying to get it to start. Another thing has happen is while cranking WOT I busted 2 starters.
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Thread Starter
Teching In
Joined: Mar 2019
Posts: 39
Likes: 0
From: Dallas TX
What is the proper way to check for voltage leaving the opti and going to the pcm. Wouldn’t that test be confirmed when I see voltage at the ICM from the PCM or did I miss an important step? 😣Problem solved!Ended up being fouled plugs due to the ICM failure! I also have a set of performance wires that I believe are killing the ICM. I am going to replace with stock spec wires and see if I can get the car to run longer than 30 minutes without killing the ICM.
Last edited by Bmoore34; May 25, 2019 at 08:59 PM. Reason: Update!
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