1999 Grand Prix can't get running

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bigpula - 21 Jul 2007 03:22 GMT

I have a 1999 grand prix gt. 2 days ago it started running bad and by
yesterday it would not start at all. It sounds like it wants to start but
it won't. I have checked the fuel pressure,good. I checked for spark. I
also checked the ignition module and coil packs, both good. I replaced the
cam and crank sensors. The diagnostics reads "multiple misfire" code p0300.
I am at my wits end. Can anyone help

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Shep - 21 Jul 2007 22:37 GMT

If you have the right fuel press at the rail (45 psi for a 3.8)and spark it
should run, try spraying carb cleaner into the intake, see if it starts.

> I have a 1999 grand prix gt. 2 days ago it started running bad and by
> yesterday it would not start at all. It sounds like it wants to start but
[quoted text clipped - 3 lines]
> p0300.
> I am at my wits end. Can anyone help

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bigpula - 26 Jul 2007 01:58 GMT

I found the problem. The plenum was cracked and filling the intake with
coolant.

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bigpula - 26 Jul 2007 02:00 GMT

I found the problem. The plenum was cracked and filling the intake with
coolant. Its running great now.

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