Question about 2003 Pontiac Grand Am
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Posted on Jan 02, 2017
How's your oil? Is the level high, or is the color milky? You've basically replaced your cooling system, all that CAN be wrong would be a corroded block [unrelated to anything you mentioned] or an internal leak. If the heat sensor loses contact with the coolant, it'll go nuts like that. And I'm guessing that could trigger the computer to go into panic mode. I suspect a leaking head gasket. Not that bad if you fix it yourself or know someone who will do it for friendship.
Posted on Nov 15, 2008
SOURCE: Pontiac Shutdown
I can solve your problem. I have the same Pontiac, year, make everything....The same thing happend to me...Turned out to be the coil packs. The car died while I was driving and then ran like ****.
Posted on Jun 28, 2009
You may be suffering from a warped manifold. Did this problem arrive over time or after engine work involving the heads? Remove the manifold and take it to a machine shop to verify warpage. They may be able to resurface the port areas without removing too much metal. Hopefully, a doubled gasket set will replace the removed metal. If not, another manifold is in order.
Posted on Oct 18, 2009
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