93 LT1 Won't Restart
Thread Starter
6th Gear
Joined: Apr 2008
Posts: 6
Likes: 0
93 LT1 Won't Restart
Looking for a little help on this one. I have a 93 LT1 that starts right up when cold. When running it runs fine, good idle and smooth throughout range without codes. Once you shut it off and try to restart it just cranks and won't start. I am getting spark and FP is 40-42, but it won't start. If I disconnect battery and then reconnect, the engine starts right up and runs fine. Shut it back off and try to restart and nothing. Since I am not getting codes, I am not sure where to look. The only thing I do see is the ASR light comes on every now and then. The engine has an MSD Opti, a Comp Cam and a PCMforless chip in it. Any help would be great.
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
Looking for a little help on this one. I have a 93 LT1 that starts right up when cold. When running it runs fine, good idle and smooth throughout range without codes. Once you shut it off and try to restart it just cranks and won't start. I am getting spark and FP is 40-42, but it won't start. If I disconnect battery and then reconnect, the engine starts right up and runs fine. Shut it back off and try to restart and nothing. Since I am not getting codes, I am not sure where to look. The only thing I do see is the ASR light comes on every now and then. The engine has an MSD Opti, a Comp Cam and a PCMforless chip in it. Any help would be great.
Instructor
Joined: Jan 2010
Posts: 174
Likes: 4
From: Austin_Palm Bay_Houston Texas_Florida_Texas
A bad or faulty CLT can cause issues similar to this(but usually a delayed engine start is the symptom). Check the temps on dig. cluster and make sure that at cold start up, the dig. temp is close to outside ambient. Then when hot, make sure temp. is reading normal hot(let's say 200F), and is not bouncing all over the place.
Just a thought.......
Just a thought.......
Thread Starter
6th Gear
Joined: Apr 2008
Posts: 6
Likes: 0
Thanks for pointers. I am uneasy about shooting starting fluid directly into intake (heard plenty of bad things can happen). The temp is fine, no issues.
I am still wondering why when I reset the ECM (disconnect battery and reconnect) the engine will start right up. There are no codes being lit up except for intermittent Service ASR light. I have a TTS trace but it doesn't really show anything glaring.
I am still wondering why when I reset the ECM (disconnect battery and reconnect) the engine will start right up. There are no codes being lit up except for intermittent Service ASR light. I have a TTS trace but it doesn't really show anything glaring.
Thread Starter
6th Gear
Joined: Apr 2008
Posts: 6
Likes: 0
TTS Trace information. While looking at my trace it shows the BPW and INJ DC at zeros when it won't start. This is telling me while cranking that the Injectors are not kicking in. Upon reset of the ECM, I get values for BPW and INJ DC and the engine starts right up. Can anyone tell me what sensors or switches are used to tell the ECM to "turn on" the injectors?
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Instructor
Joined: Aug 2009
Posts: 242
Likes: 0
From: La Verne California
Same Issue
Looking for a little help on this one. I have a 93 LT1 that starts right up when cold. When running it runs fine, good idle and smooth throughout range without codes. Once you shut it off and try to restart it just cranks and won't start. I am getting spark and FP is 40-42, but it won't start. If I disconnect battery and then reconnect, the engine starts right up and runs fine. Shut it back off and try to restart and nothing. Since I am not getting codes, I am not sure where to look. The only thing I do see is the ASR light comes on every now and then. The engine has an MSD Opti, a Comp Cam and a PCMforless chip in it. Any help would be great.
I can only hope.
Burning Brakes
Joined: Aug 2007
Posts: 792
Likes: 16
From: Austin Tx
Doesn't sound like the regulator. If the diaphram is busted you will usually smell raw gas coming out the right side exhaust on start up. An easy check though is to pull the vacuum hose off of the regulator and see if any gas is present. If any gas is there then change the regulator.
Team Owner
Joined: Oct 2000
Posts: 96,443
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From: Fort Knox, KY
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