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#1
04-16-2009, 12:36 PM
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gtp running rough and gutless
My gtp has been running terrible and getting worse. I scanned it and got 3 codes. 0171 system too lean bank 1 0420 catalyst efficiency below threshold bank 1 0453 evap emission control system pressure sensor high. I had a mass air flow code before but i changed it out. I f you have any ideas i would really appreciate it.
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#2
04-16-2009, 01:59 PM
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Re: gtp running rough and gutless
What year is your GTP. If it's an 01-02, there is a known issue with the catalytic converters plugging the exhaust. GM actually extended the warranty on these for that reason.
__________________
 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#3
04-16-2009, 05:18 PM
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Re: gtp running rough and gutless
Hey......miner327......Hibbing I see. Soon to be neighbors in July. I'm moving to Pengilly after i retire from the Air Force.
Lefty '93 Grand Prix "Special Edition" 160K '05 Grand Prix 63K
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#4
04-17-2009, 08:55 AM
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Re: gtp running rough and gutless
It is a 98. I had the catalytic converter replaced not too long ago. But I don't think it was plugged. It doesn't backfire it misses like it is starving for gas. I took the belt off for the supercharger and it doesn't miss as much but it still misses pretty bad.
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