My GF owns a 94 Sunbird that randomly doesn't like to start. Sometimes it'll start up and run perfectly, other times you can crank it and crank it without it starting. Give it a little gas and it'll start, but let off the accelerator and it dies instantly. It has the most trouble when the motor is warm although it won't start cold sometimes too. I've had it on the scan tool and noticed when the car starts on it's own all the parameters read great and nothing is out of the ordinary. When you have to force it to start, most parameters are good except the fuel trims are real rich, which you can smell in the exhaust, and the IAC position is real high. There are no vacuum leaks, base fuel pressure is
37-38psi, car has good spark, and the egr has been blocked off for diagnosing the problem because the valve is stuck open allowing rich exhaust gas into the intake during idle. I thought maybe the fpr was bad, but there is no sign of fuel in the vacuum line (hence its leaking) and it seems to hold pressure in the system after the car is turned off. any help is greatly appreciated.- posted
20 years ago