1985 corvette
Thread Starter
Intermediate
Joined: Nov 2019
Posts: 27
Likes: 0
From: Norwich, UK
1985 corvette
Help needed
my 1985 c4 corvette is driving me mad....
starts and runs fine from cold. Once up to temperature cuts out at idle and doesn’t restart. Only way to get it to restart is by spraying brake cleaner down the intake ( which I don’t like doing )
the car had a new fuel pressure regulator last year along with new fuel pump in the tank
thank you in advance for any advice. I’m desperate to get this car on the road again
my 1985 c4 corvette is driving me mad....
starts and runs fine from cold. Once up to temperature cuts out at idle and doesn’t restart. Only way to get it to restart is by spraying brake cleaner down the intake ( which I don’t like doing )
the car had a new fuel pressure regulator last year along with new fuel pump in the tank
thank you in advance for any advice. I’m desperate to get this car on the road again
Burning Brakes
Joined: Nov 2000
Posts: 986
Likes: 487
Help needed
my 1985 c4 corvette is driving me mad....
starts and runs fine from cold. Once up to temperature cuts out at idle and doesn’t restart. Only way to get it to restart is by spraying brake cleaner down the intake ( which I don’t like doing )
the car had a new fuel pressure regulator last year along with new fuel pump in the tank
thank you in advance for any advice. I’m desperate to get this car on the road again
my 1985 c4 corvette is driving me mad....
starts and runs fine from cold. Once up to temperature cuts out at idle and doesn’t restart. Only way to get it to restart is by spraying brake cleaner down the intake ( which I don’t like doing )
the car had a new fuel pressure regulator last year along with new fuel pump in the tank
thank you in advance for any advice. I’m desperate to get this car on the road again
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
Instructor
Joined: Jun 2019
Posts: 147
Likes: 48
From: Rockland County, New York
Thread Starter
Intermediate
Joined: Nov 2019
Posts: 27
Likes: 0
From: Norwich, UK
Thank you, very helpful link
i have not touched the car for a few days. I went to it about an hour ago and it started up after cranking for roughly 10seconds. It ran up to temp. Soon as the engine gets warm it still cuts out, I haven’t got a fuel gauge but I suspect the fuel pressure is not holding up. I did replace the fuel pressure regulator and the sender unit with new pump last year, I have a new set of fuel injectors which I will fit one evening this week. One of my mates commented the car sticks of fuel At the back like it’s over fuelling which is also leading me to think the injectors are going bad
has anyone else had bad injectors and had similar symptoms? Thanks again for your help
i have not touched the car for a few days. I went to it about an hour ago and it started up after cranking for roughly 10seconds. It ran up to temp. Soon as the engine gets warm it still cuts out, I haven’t got a fuel gauge but I suspect the fuel pressure is not holding up. I did replace the fuel pressure regulator and the sender unit with new pump last year, I have a new set of fuel injectors which I will fit one evening this week. One of my mates commented the car sticks of fuel At the back like it’s over fuelling which is also leading me to think the injectors are going bad
has anyone else had bad injectors and had similar symptoms? Thanks again for your help
Drifting
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
The Ignition Control Module can cut out when hot. Heat can screw up a lot of things. The ICM should be replaced if it is not known how old it is, Put new computer thermal paste under just a slight film will do it.
Drifting
Joined: Nov 2015
Posts: 1,333
Likes: 397
From: Clay New York
I would think that if the injectors were bad you would have an issue even at start up. Just because you replaced something doesn't mean you can automatically rule it out. Confirm that it is still functioning like it's supposed to.
Racer
Joined: Nov 2020
Posts: 289
Likes: 48
From: Dover N.H.
I don't know if this relates to the 85 but it sounds like a problem in closed loop? O2 sensor or MAF?
MAF Sensor question ?? "1985 L98" - CorvetteForum - Chevrolet Corvette Forum Discussion
MAF Sensor question ?? "1985 L98" - CorvetteForum - Chevrolet Corvette Forum Discussion
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Thread Starter
Intermediate
Joined: Nov 2019
Posts: 27
Likes: 0
From: Norwich, UK
Since my last reply I have replaced the injectors which has resolved the long crank time from cold it starts instant now but still cuts out when warm and idle goes rough. I replace the maf last year as I was having the same issue then still not resolved. Only thing I haven’t replaced is the icm and ignition coil
replacing the injectors has made the car sound like it has a different engine so I suspect my old ones were not 100%
i have booked the corvette into a American car specialist as I have reached my limit on knowledge, it’s possible something simple I’m not doing correctly however I’m not an expert when it comes to engines/ electronics
thanks for all your help and I will keep you informed with my progress
replacing the injectors has made the car sound like it has a different engine so I suspect my old ones were not 100%
i have booked the corvette into a American car specialist as I have reached my limit on knowledge, it’s possible something simple I’m not doing correctly however I’m not an expert when it comes to engines/ electronics
thanks for all your help and I will keep you informed with my progress
