Thread: New and in Need of Help in Oklahoma

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  1. #1 New and in Need of Help in Oklahoma 
    antpearl
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    Default 11-07-2010
    Just purchased my 4th Grand Prix. This is a '99 GT. And Surprise...intake and valve cover gaskets need to be replaced. Not to worry, all gaskets replaced (including those ridiculous plastic elbows. Car runs just fine...except P0123, P0118 and P1635. I would appreciate any feedback from the forum on why I would just now be receiving these trouble codes. Also, the gasket kit I got came with a thermostat gasket, but when I removed the old thermostat there was only the rubber ring inside. I replaced the ring and installed the gasket. Again. car runs fine every other start. The IAC has to be reset at ignition to get normal idle.

    Thanks for the help
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  2. #2 Re: New and in Need of Help in Oklahoma 
    Silver GTP
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    Default 11-08-2010
    You don't need the extra thermostat gasket. The rubber ring is the seal. For those three codes to come up at the same time, I would double check all the connections to coolant temp sensor and throttle position sensors. If those look good, start looking for places that a wire may have been damaged. If you have a meter, pull those two plugs and make sure you have 5 volts going to them when the ignition is on.

    2002 GTP: GMPP Sway Bars, BMR trailing arms, KYB AGX/Vogtlands, 12" brake upgrade
    Modified SSAC headers, K&N Intake, 3.4 MPS, S1X, Gen V, 104's, HPTuned.
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  3. #3 Re: New and in Need of Help in Oklahoma 
    antpearl
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    Default 11-09-2010
    Thank You for responding. Luckily my neighbor has a Regal LS. I was able to look under his hood and found that I had flipped the temp sensor and the throttle position sensor. After that correction and a code clear, no more issues. Well...except the car still smells hot now.
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