Question about 2004 Pontiac Grand Am

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2004 Grand Am V6 Will crank but not start in morning only

I have been scratching my head on this issue for sometime now.
In the morning hours the car will crank over fine, you can hear the fuel pump prime, no security light but just will not start. I have to leave to work so I have no time to trouble shoot the issue. I come home in the afternoon and it fires right up and runs fantastic. I have already ruled out the security issue, I have changed both the crank position sensors, the battery is new, starter works good. The car has less then 90K on it. Our mornings here have been in the 70's and high 90's in the afternoon. I'm thinking now it's a thermal issue with the computer.
Any other ideas that I might check?

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  • Richard Scordino May 11, 2010

    On a day your'e not working, try heating up the computer with a hair dryer and see if it starts...that would verify your theory. Might not be the computer itself, could be a bad plug connection.

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  • Pontiac Master
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Check the MAP sensor and the wire harness to the map sensor. Next time it will not start, try disconnecting the MAP sensor and see if it starts. IF it does then change the sensor. Good luck and hope this helps.

Posted on Jun 15, 2009

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