Hard start when HOT
Thread Starter
Racer
Joined: Jan 2006
Posts: 313
Likes: 3
From: North of Boston Ma
Hard start when HOT
There has been many threads on this subject, but besides the injectors and fuel pressure is there a sensor that would cause the engine when its HOT to have a hard-start. Its almost at the point where the starter has to bring the engine to a spin start holding key for about 10-15 seconds. When cold it starts first crank even when not starting for a complete year.
Car runs great after hard-start.
1987 coupe L98 55000 miles
Thanks in advance
Car runs great after hard-start.
1987 coupe L98 55000 miles
Thanks in advance
Thread Starter
Racer
Joined: Jan 2006
Posts: 313
Likes: 3
From: North of Boston Ma
If it did have codes they got wiped off because I just replaced the battery yesturday. As far as the sensor I don't know if it has one or where it is, but thats what I'm thinking might be wrong. Its starts fine when cold. I thought maybe the coil has a crack and expands when hot making it hard to start.
Team Owner
Joined: Jan 2003
Posts: 20,316
Likes: 246
From: Summerland B.C. Canada
Do you hear the fuel pump run for 2 seconds, when key first turned on ?
Just wondering if you have a pump relay problem and the fuel pump is being powered by the oil pressure switch. When the oil is hot, it may take a lot of cranking to build up enough psi to close switch.
Just wondering if you have a pump relay problem and the fuel pump is being powered by the oil pressure switch. When the oil is hot, it may take a lot of cranking to build up enough psi to close switch.
Thread Starter
Racer
Joined: Jan 2006
Posts: 313
Likes: 3
From: North of Boston Ma
Do you hear the fuel pump run for 2 seconds, when key first turned on ?
Just wondering if you have a pump relay problem and the fuel pump is being powered by the oil pressure switch. When the oil is hot, it may take a lot of cranking to build up enough psi to close switch.
Just wondering if you have a pump relay problem and the fuel pump is being powered by the oil pressure switch. When the oil is hot, it may take a lot of cranking to build up enough psi to close switch.
Drifting
Joined: Jul 2007
Posts: 1,294
Likes: 37
Do you have a fuel pressure gauge? See if one or more of your injectors is leaking a little fuel when hot. You hook the gauge up and see how long it holds steady fuel pressure for at least 30 mins (i think) after you shut the engine down.
