Engine Mechanical problem
2003 Oldsmobile Alero 4 cyl Front Wheel Drive Automatic 160K miles
2003 Oldsmobile Alero
Ok. My car won't start when its above a certain temperature outside (around 85 or 90 Degrees F). Here is what I know so far:
*The fuel pump is good, however doesn't come on when I turn my key to "On". I know this because my car will run at night when its cool.
*I can turn my key off and on and cannot here the fuel pump kicking in.
*When fuel pump does come on, fuel pressure is great.
*Tried replacing fuel pump relay and PCM. Still no go.
* When it doesn't start, I can also here the fuel pump buzzing like crazy. I have switched relays around (relays I know are good), and they all do the same thing in the fuel pump relay spot.
*If I sit with the doors open for about 15 minutes (allowing the inside of the car to cool down), I can usually get the pump to come on, after cycling the key from off to on a few times.
*Problem is NOT type or level of fuel related. I've been buying the same gas from the same place, as well as other places, and the problem has occured on a full tank, half tank, and quarter tank.
*No engine codes. I've had the best mechanics in town working on this. Plugged in a very nice diagnostic computer, and saw the following while cranking:
*Engine RPMs normal
*Fuel Pump Relay Command is staying off.
Thats the problem right there. My computer isn't telling my fuel pump to come on. The mechanics even put a jumper on my fuel pump and it turned on and the car ran fine. What is causing my computer to not tell my pump relay to not power the pump? I don't think it is a Passlock Problem, as my light on my dash blinks like normal. I have also tried the old "leave the key on for 10 min to reset the security system" trick and still no go. I have even disconnected my battery before and left it for about 10 minutes to reset the computer, and still no go.
have the same problem?
Monday, June 14th, 2010 AT 12:00 PM