The engine cuts out
Thread Starter
2nd Gear
Joined: Jan 2022
Posts: 2
Likes: 0
From: Poland
The engine cuts out
Hi, my name is Damian and I live in Poland. Three years ago I bought a 1987 Corvette automatic in Fremont, NH.
A month ago the engine in my car started to die, after starting it it continued to drive. Code 42 appeared, I replaced the wiring and a new ignition control module. Now there is no code, but the engine keeps turning off.
I noticed that this happens at low speeds and engine revs (in the city), when I drive faster there is no problem. Sometimes the code 34 MAF appears, but it has always been there since I bought the car and it doesn't bother me. What else can I do?
P.S. Sorry for my poor English.
A month ago the engine in my car started to die, after starting it it continued to drive. Code 42 appeared, I replaced the wiring and a new ignition control module. Now there is no code, but the engine keeps turning off.
I noticed that this happens at low speeds and engine revs (in the city), when I drive faster there is no problem. Sometimes the code 34 MAF appears, but it has always been there since I bought the car and it doesn't bother me. What else can I do?
P.S. Sorry for my poor English.
Melting Slicks
Joined: May 2003
Posts: 2,076
Likes: 281
From: Dyersburg TN
your statement "code 43....doesnt bother me" caught my eye. The MAF sensor is used by the computer to set fuel/air ratios. If it is having issues with the sensor or wiring the computer could be starving or drowning the car. Check for vacuum leaks and test / clean / replace MAF or it's wiring.
Pro
Joined: Aug 2021
Posts: 503
Likes: 33
From: S Fla
Will a bad maf do the same on a 94? I've been having an issue with the car just shutting off with no warning at all. Then sometimes it will start right up again, sometimes it won't start for hours. No spark, no fuel. No voltage at the fuel pump. No square wave from the opti.
Melting Slicks
Joined: May 2003
Posts: 2,076
Likes: 281
From: Dyersburg TN
Not 100% positive and someone will correct if I am wrong but if you loose data from MAF computer should best guess it and run (if somewhat poorly).
When you say "won't start" and no spark, etc do you have lights and does engine turn at all? This feels like a bad ground/cable issue just from your statement.
When you say "won't start" and no spark, etc do you have lights and does engine turn at all? This feels like a bad ground/cable issue just from your statement.
Will a bad maf do the same on a 94? I've been having an issue with the car just shutting off with no warning at all. Then sometimes it will start right up again, sometimes it won't start for hours. No spark, no fuel. No voltage at the fuel pump. No square wave from the opti.
Pro
Joined: Aug 2021
Posts: 503
Likes: 33
From: S Fla
Not 100% positive and someone will correct if I am wrong but if you loose data from MAF computer should best guess it and run (if somewhat poorly).
When you say "won't start" and no spark, etc do you have lights and does engine turn at all? This feels like a bad ground/cable issue just from your statement.
When you say "won't start" and no spark, etc do you have lights and does engine turn at all? This feels like a bad ground/cable issue just from your statement.
I'm sorry. I wasn't trying to hijack the thread, just looking for a similarity that might help with my own issue.
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Advanced
Joined: Jul 2023
Posts: 57
Likes: 3
From: Connecticut
A bad opti should not deny power to the fuel pump, if you turn the key into accessory you should hear it priming regardless of whether the opti has power or not.
If you do not hear that noise from the rear and measured the voltage like I assume you did, it might be worth checking the wiring. Most of the time even worn out
fuel pumps still pump, just with low pressure given they have voltage. If its not working at all then you know.
If you do not hear that noise from the rear and measured the voltage like I assume you did, it might be worth checking the wiring. Most of the time even worn out
fuel pumps still pump, just with low pressure given they have voltage. If its not working at all then you know.
Pro
Joined: Aug 2021
Posts: 503
Likes: 33
From: S Fla
A bad opti should not deny power to the fuel pump, if you turn the key into accessory you should hear it priming regardless of whether the opti has power or not.
If you do not hear that noise from the rear and measured the voltage like I assume you did, it might be worth checking the wiring. Most of the time even worn out
fuel pumps still pump, just with low pressure given they have voltage. If its not working at all then you know.
If you do not hear that noise from the rear and measured the voltage like I assume you did, it might be worth checking the wiring. Most of the time even worn out
fuel pumps still pump, just with low pressure given they have voltage. If its not working at all then you know.
And no spark at any time.
Last edited by Gasnmyveins; Oct 25, 2023 at 06:17 PM.
Advanced
Joined: Jul 2023
Posts: 57
Likes: 3
From: Connecticut
That's interesting. I don't envy your issue, I have one of my own and can understand the frustration. Have you considered your fuel pump control module? Its clearly getting enough power to prime, so it should have enough to pump at least a little. It must be a data issue. This could stem from the ecu or standalone control module.
Pro
Joined: Aug 2021
Posts: 503
Likes: 33
From: S Fla
That's interesting. I don't envy your issue, I have one of my own and can understand the frustration. Have you considered your fuel pump control module? Its clearly getting enough power to prime, so it should have enough to pump at least a little. It must be a data issue. This could stem from the ecu or standalone control module.
Pro
Joined: Aug 2021
Posts: 503
Likes: 33
From: S Fla
Well, here's the most likely cause. It was expensive, but at least I won't wonder if it's going to quit 1,000 miles from now. Since I'm at 105,000 miles, it could go at any time, so I feel like it should be done to avoid being stranded somewhere anyhow. I'll also do the timing chain while it's already apart.