Engine Problems
Thread Starter
Heel & Toe
Joined: Jan 2014
Posts: 19
Likes: 0
Engine Problems
Recently I have been stopping at traffic lights after my 85 vette has warmed up and the check engine light comes on. When the light turns to green it takes about eight to ten seconds and the check engine light goes out. I checked out the engine code and I have code 23. In addition, when the car is warmed up and I stop anywhere for ten minutes or so and when I try to restart I have an extremely hard time trying to start the car. I knew some time ago after hooking up a gas pressure gauge to the fuel line that my fuel pressure goes down slowly. I replaced the fuel pump but have not had the time to replace the fuel injectors yet.
Does anyone have any recommendations since this car is wearing me down with it's problems? Love to drive it but dealing with one problem after another can wear on my patience since I had got it. Just took care of a window regulator issue and hopefully that is the last of that problem.
Thank you in advance of any advice you can provide me,
Ron
Does anyone have any recommendations since this car is wearing me down with it's problems? Love to drive it but dealing with one problem after another can wear on my patience since I had got it. Just took care of a window regulator issue and hopefully that is the last of that problem.
Thank you in advance of any advice you can provide me,
Ron
Melting Slicks
Joined: Feb 2003
Posts: 2,661
Likes: 806
From: Saskatoon Sask.
When is the last time you checked your oil? Is it over full and smelling like gas? If you have a lot of miles, your injectors may be leaking and diluting your oil, causing no pressure under low rpm. This would also cause your hard starts.
Racer
Joined: Apr 2018
Posts: 349
Likes: 55
Recently I have been stopping at traffic lights after my 85 vette has warmed up and the check engine light comes on. When the light turns to green it takes about eight to ten seconds and the check engine light goes out. I checked out the engine code and I have code 23. In addition, when the car is warmed up and I stop anywhere for ten minutes or so and when I try to restart I have an extremely hard time trying to start the car. I knew some time ago after hooking up a gas pressure gauge to the fuel line that my fuel pressure goes down slowly. I replaced the fuel pump but have not had the time to replace the fuel injectors yet.
Does anyone have any recommendations since this car is wearing me down with it's problems? Love to drive it but dealing with one problem after another can wear on my patience since I had got it. Just took care of a window regulator issue and hopefully that is the last of that problem.
Thank you in advance of any advice you can provide me,
Ron
Does anyone have any recommendations since this car is wearing me down with it's problems? Love to drive it but dealing with one problem after another can wear on my patience since I had got it. Just took care of a window regulator issue and hopefully that is the last of that problem.
Thank you in advance of any advice you can provide me,
Ron
Team Owner
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
Thread Starter
Heel & Toe
Joined: Jan 2014
Posts: 19
Likes: 0
Thank you for your response.
Thread Starter
Heel & Toe
Joined: Jan 2014
Posts: 19
Likes: 0
Thank you for your response.
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Thread Starter
Heel & Toe
Joined: Jan 2014
Posts: 19
Likes: 0
My Girlfriend's 86 does the same thing - IAT code set at idle. I haven't dug into the issue much, but I plan on starting with a new sensor/connector if the wiring looks good. The only reason I haven't jumped on it yet is that the stock ECM only used IAT for activating EGR, so I really couldn't care less if its working or not.
Instructor
Joined: Feb 2017
Posts: 137
Likes: 21
From: Akron Ohio
May not be the same issue, but I had an issue with the 2nd time and after that I started the car each day. I would have to press the accelerator pedal and then she would start but blow what turned out to be raw fuel through the exhaust. The fuel pressure regulator diaphragm was shot and probably original. I replaced it this winter and the car starts and runs really well now. My wife hated to ride in it unless we were coming straight home afterwards. For some reason she hated to smell like gas fumes....?
Racer
Joined: Apr 2018
Posts: 349
Likes: 55
Thanks for your response. Best of luck when you try to repair it. I've got some digging to do on my car. Does your girlfriend's car have gremlins in it like mine. I call my car "Christine" like the movie. I have to keep eliminating the gremlins one by one. I think they keep multiplying. Good luck.
The 86 I have less time to work on, and it gets driven less, so it still has issues - I've got the driver window aligned, but the passenger one still needs it. I've come to hate doing the windows on these cars. It has a dash bulb burnt out, antenna will go up or down, but only if you jumper it, the dash loses all lights sometimes over a bump, plus this CEL for the intake air temp. I'll probably get to those this summer. It'll feel overwheling at times, and you may find yourself wanting an easy way out, but I really think the early C4s are the perfect car for my style/interests.
Thread Starter
Heel & Toe
Joined: Jan 2014
Posts: 19
Likes: 0
May not be the same issue, but I had an issue with the 2nd time and after that I started the car each day. I would have to press the accelerator pedal and then she would start but blow what turned out to be raw fuel through the exhaust. The fuel pressure regulator diaphragm was shot and probably original. I replaced it this winter and the car starts and runs really well now. My wife hated to ride in it unless we were coming straight home afterwards. For some reason she hated to smell like gas fumes....?
Ron
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
the connector then your FPR diaphragm is bad. Ask me how I know X2 since I owned my 1986.
Bad FPR diaphragm
Last edited by 3D-Aircrew; Apr 26, 2018 at 03:21 PM. Reason: pics
Instructor
Joined: Feb 2017
Posts: 137
Likes: 21
From: Akron Ohio
I have no issues with gas fumes or smoke since changing the diaphragm. Now if I could just get the OD unit on my 4+3 to quit blowing ATF all over my exhaust she'd be a lot more fun. I'm dropping the OD pan tonight to get rid of the remaining ATF and shutting the OD down until she's put away this fall. Between the smoke from the ATF on my exhaust and having to degrease the underside of the car every time I drive it it's easier to drain the fluid and drive her as a 4speed for the summer.
Last edited by Buckeye88; Apr 27, 2018 at 11:23 AM.
Melting Slicks
Joined: Feb 2003
Posts: 2,661
Likes: 806
From: Saskatoon Sask.
That's about what mine looked like, but where you can see the cloth/weave backing on yours that's where I still had a few scraps of rubber. I pulled the vacuum lines once and they were full of gas.
I have no issues with gas fumes or smoke since changing the diaphragm. Now if I could just get the OD unit on my 4+3 to quit blowing ATF all over my exhaust she'd be a lot more fun. I'm dropping the OD pan tonight to get rid of the remaining ATF and shutting the OD down until she's put away this fall. Between the smoke from the ATF on my exhaust and having to degrease the underside of the car every time I drive it it's easier to drain the fluid and drive her as a 4speed for the summer.
I have no issues with gas fumes or smoke since changing the diaphragm. Now if I could just get the OD unit on my 4+3 to quit blowing ATF all over my exhaust she'd be a lot more fun. I'm dropping the OD pan tonight to get rid of the remaining ATF and shutting the OD down until she's put away this fall. Between the smoke from the ATF on my exhaust and having to degrease the underside of the car every time I drive it it's easier to drain the fluid and drive her as a 4speed for the summer.