Question about 1998 Pontiac Grand Am

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1998 Pontiac Grand AM GT motor revs

1998 Pontiac Grand AM GT motor revs inadvertantly / increases speed and will not rev down. Happens in both summer and winter driving conditions. RPMS at 2500-3000 then will quit, and begin running normal. What could this be, a oxygen sensor?

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  • Pontiac Master
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It would not be an O2 sensor, period, they would never cause a high idle, have u had this checked for trouble codes? A sticking idle speed control air bypass can cause this problem as well as a throttle position sensor, but run the codes, Kragen does it for free was well as other parts stores.

Posted on Mar 10, 2009

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likely what you are seeing is the first signs of slipping. If permitted to continue, likely it will get worse and you will then lose a bit of speed when it happens. In warmer weather the trans runs a bit hotter and will react to that. If you cannot hear the revs increasing but the tach says they are, it's also possible that for some reason the tach isn't reading correctly. Any good tech should be able to tell the difference. Problem I have is that I'm here and can't drive it to give you a "definite" on either.The only way to verify this yourself would be to attach an external tach to the engine and compare the rpms of the one in your dash to that one.

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