1995 Corvette LT1 stalling
Thread Starter
Cruising
Joined: Jan 2011
Posts: 14
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1995 Corvette LT1 stalling
HI, I'm new to the group although I have followed for years. I have 1995 Coupe with 37,500 original miles ( it's my wife's ). I have been having a problem with the car, it starts great, no bad idle, but once I drive the car for about 10 minutes (getting up to temp) it stalls. If I'm driving the stall takes place if a take my foot off the throttle and coast, or if I come to stop at a light. I replaced the ICM and Coil. NO effect at all. I'm about to change the Optispark and while doing that I'll change to an electric water pump. I feel like I'm just parts chasing hoping to cure the problem.
Has anyone had, or heard, of this problem. I'm lost and could use all the help I can get. Many thanks.
Has anyone had, or heard, of this problem. I'm lost and could use all the help I can get. Many thanks.
Race Director
Joined: Oct 2012
Posts: 17,428
Likes: 6,544
From: Melbourne, FL
You feel like your throwing parts at it because you are. You need to pull the codes, If it's the opti, it should throw a code. If there's no codes, you need to replicate it In a situation where you can immediately test things like fuel pressure, and voltages in the ignition system. Does the car restart immediately, or does it have to cool down first?
I had intermittent no starts and stalls that were caused by the old plastic connectors getting hot in the engine bay, and being old and worn, not making contact anymore. Your problem could be as simple as that. Don't throw more parts at it (especially an opti) until you actually troubleshoot it.
Your stall sounds more like an IAC issue. I'm guessing it's an automatic? Is the idle super low as well?
I had intermittent no starts and stalls that were caused by the old plastic connectors getting hot in the engine bay, and being old and worn, not making contact anymore. Your problem could be as simple as that. Don't throw more parts at it (especially an opti) until you actually troubleshoot it.
Your stall sounds more like an IAC issue. I'm guessing it's an automatic? Is the idle super low as well?
Last edited by FAUEE; Mar 27, 2020 at 09:49 AM.
Thread Starter
Cruising
Joined: Jan 2011
Posts: 14
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The car will restart immediately usuallyl have to wait about 5 -10 minutes. Hot days that time goes up. It is an automatic. The idle when cold is at about 1000rpm, once off high idle it drops to between 500-600RPM and is very rough. I Know this sounds odd but the exhaust smell is bad and seems to be running overly rich. Thanks
Race Director
Joined: Oct 2012
Posts: 17,428
Likes: 6,544
From: Melbourne, FL
The car will restart immediately usuallyl have to wait about 5 -10 minutes. Hot days that time goes up. It is an automatic. The idle when cold is at about 1000rpm, once off high idle it drops to between 500-600RPM and is very rough. I Know this sounds odd but the exhaust smell is bad and seems to be running overly rich. Thanks
If you've recently replaced the icm, that's one less thing to worry about - assuming it was replaced after this all started. I would check the connectors to the coil, icm, and opti and see if any of them are kinda loose, or just feel worn.
Thread Starter
Cruising
Joined: Jan 2011
Posts: 14
Likes: 0
It does or it doesn't restart? Your statements contradict each other.
If you've recently replaced the icm, that's one less thing to worry about - assuming it was replaced after this all started. I would check the connectors to the coil, icm, and opti and see if any of them are kinda loose, or just feel worn.
If you've recently replaced the icm, that's one less thing to worry about - assuming it was replaced after this all started. I would check the connectors to the coil, icm, and opti and see if any of them are kinda loose, or just feel worn.
Le Mans Master
Joined: Aug 2015
Posts: 6,125
Likes: 2,001
From: St. Charles MO
I get the sense that this is a heat-related ignition failure, but rather a bad sensor somewhere that is not read in open-loop (from cold start until it warms up), but is read in closed-loop. When you let it cool enough to go back to open-loop at startup, then it's happy again until it warms up enough to go back into closed-loop. The thing about it smelling rich leads me to wonder if it's a bad O2 sensor. These don't always seem to throw codes on pre-96 cars. It doesn't have a ton of miles on it, but those sensors are wear items in a sense. It might be useful to replace them as a matter of maintenance.
