Ok guys heres what ive got i was wanting to buy a 87 T/A with a L98 in it but it starts cold but it wont start again until it cools down almost completely cold but i did notice that fuel pump runs all the time and i know thats not good so could it be the regulator or something like that and i also tried to pull the codes and i got nothing not even a code 12 i mean the check engine light didnt even flash but when you crank the motor the check engine light pulses on and off so could it be the computer. All help is appreciated guys

 

How long do you run it before you shut it off?
I mean, if you start it, backed up your driveway, turned it off, then tried to start it, would it start?
Or do you have to drive it for say 1/2 an hour then turn it off?
How hot is the engine getting? Does your temp gauge work?
Does it crank fast or very slow when it cranks?
Do you have headers?

 

Well I can get in it run up the road a half mile or so come back turn it off and try to start it and it wont do anything but crank and crank until it gets completely cold and the temp goes up to about 220 but never hotter than that.

 

If it were me, I would check two things first.
There is a temperature sending unit for the computer.
Try unplugging it then starting next time it won't start.

2nd. might be vapor lock. Try measuring the fuel pressure at the fuel rails.


You might also want to try to unplug the o2 sensor next time this happens and see if that makes a difference. but don't ground it or burn yourself.

Thats just off the top of my head.
Thinking that if item 1 or 3 are not working correctly, they could be feeding the ECM the total wrong message.

Just guessing at this point, but test / eliminate / test some more.. always a good start.

 

Ok tried the fuel pressure 44psi replaced O2 and also the Coolant Sensor but i talked to a guy from Hawks Third Gen he said that it sounded like it was the pump or the pump relay could i get your guys input on this because the FP is a bitch to take out Thanks