Huge jam! 03 grand prix GT - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-12-2015, 10:32 PM   #1
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Default Huge jam! 03 grand prix GT

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Absolutely in a jam with this car, recently moved across country to arizona from ct and I feel all my issues started, I've only owned since July 2013, it now has 155,000 miles, right after purchasing I put a brand new gm factory built transmission, shortly after coming here my car died, my only semi mechanical freind found it was the fuel pump, in a limited budget u got a cheap fuel pump, had to put a different wiring harness on then what came with due to manufactor issues. I feel like shortly after my check engine light came on, so had him check all lines again and looked good,have had codes EVER since, needless to say car ran fine with engine light on, until in the past 3 months I've put over 3k into the motor, having done upper aND lower manifold gaskets, plus hoses and thermostat and water pump, month after that felt a slip in tranny, checked fluid and was down 4 quarts, bring to a dealership because transmission is under warranty only to be told my transmission cooler erupted in the radiator, soo 1,800$ later I have new radiator,reservoir, thermostat AGAIN, upper and lower hoses AGAIN because we're swollen... dealership pulled codes but NON had to do with tranny so they ignored because thays not why car was there, codes they pulled were P0440,P0446,P0453,P01441, I've looked up codes I know most have to do with evap system but how can I fix this!? On a very now fixed budget because of these larger issues occurring before fixing the engine light problem. Also since lights come on I've replaced gas cap, spark plugs, purge valve, latest issue is just randomly dying at idle, been in middle of busy intersection and just shuts off, starts short time later, changed fuel filter couple days ago, things seemed fine and actually light dissapeared, then died today when I went into gas station, I've eead alot,watched videos for changing sencors ect... but I'm alone out here and in need of some trouble shooting and advice! Please and thanks
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Old 06-12-2015, 10:45 PM   #2
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Have you changed the mafs or any O2 sensors?
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Old 06-12-2015, 10:54 PM   #3
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No, this week I became familiar with most the sencors, the first shop who did manifold gaskets said it'* the fuel pressure sencor, but would that one sencor really cause all those codes? Also how many o2 sencors are there? I almost feel like buying all new sencors for everything just wanted to save money and pinpoint it... do I clean the throttle body? Do I u plug the sencors and clean with electoral parts cleaner and plug back in, replace everything, do just the pressure sencor, just buy a new fuel pump... lost.
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Old 06-12-2015, 11:05 PM   #4
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Those are all evap codes. You may have an issue with a purge valve or canaster.
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Old 06-12-2015, 11:23 PM   #5
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Or even possibly a fuel tank that is no longer holding a vacuum because of a leaking gasket or loose hoses. Those things can happen when fuel pumps are changed.
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Old 06-12-2015, 11:36 PM   #6
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Quote:
Originally Posted by rjolly87 View Post
Or even possibly a fuel tank that is no longer holding a vacuum because of a leaking gasket or loose hoses. Those things can happen when fuel pumps are changed.
Thanks for your input, I'm going to attempt to get to the fuel pump tomarrow through trunk and check everything again
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Old 06-13-2015, 02:45 AM   #7
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Quote:
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Those are all evap codes. You may have an issue with a purge valve or canaster.
Did purple valve twice just to make sure, how would I k ow of the charcoal canister was breaking apart?
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Old 06-13-2015, 01:00 PM   #8
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Did purple valve twice just to make sure, how would I k ow of the charcoal canister was breaking apart?
Purge valve**
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Old 06-14-2015, 11:58 AM   #9
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One thing to check is the large o-ring in the fuel tank that seals your fuel pump module to the tank...if pinched/damaged, will need replacement....
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Old 06-15-2015, 01:20 AM   #10
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One thing to check is the large o-ring in the fuel tank that seals your fuel pump module to the tank...if pinched/damaged, will need replacement....
Thank you for your input will check this weekend, praying something works
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