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Why does my 2006 Grand Prix change RPM's at highway speed?

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  • Why does my 2006 Grand Prix change RPM's at highway speed?


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Answer #1 | 14/12 2013 10:56
Thats a hard one
Positive: 53 %
Answer #2 | 14/12 2013 11:14
when in cruise mode the road may appear to be flat, but there will be slight up and down variations. cruise control maintains a constant speed, so for example on a slight uphill section a bit more engine power will be needed, so r.p.m. will increase, and on a slight downhill section decrease.
Positive: 47 %
Answer #3 | 15/12 2013 08:42
If your not noticing any type of hesitation in the car itself or stutter with the car when it happens, could be a IPC issue. Wouldn't be a sensor issue cause than you would be feeling the car as well since the PCM goes by the RPM to run the engine & if it loses CKP signal, the car would die. So my guess would be more of a wiring issue, connector issue at the IPC or the IPC itself
Positive: 27 %

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