2006 Grand Prix Supercharged Engine sputtering and etc.

Asked by May 22, 2014 at 11:54 PM about the 2006 Pontiac Grand Prix GT

Question type: Maintenance & Repair

I recently purchased a 2006 Grand
Prix GT 3.8L with a Supercharger.
The vehicle ran great on my test
drive, but after taking it home i
noticed that there is a slight chug /
sputter at low speeds (0-15) and at
some high speeds (40-45 and 50-55).

Now, I assumed that it may have
been bad gas, so I used up the
remaining gas that was in the car
when I got it, and filled it up with
brand new 93. This helped the
problem a bit, but it is still
occasionally chugging. There is no
check engine light on. Any ideas?

Additionally, the thermostat gauge
claims that the car is running cold-- I
assume this is a bad thermostat
sensor and intend on replacing it.
Could it be something else, you
think?

Thanks so much for your time

1 Answer

3,825

Or it could be a bad thermostat. Do some trouble shooting before spending money on incorrect parts. It is important that modern engines run at the correct temperature. Not sure if that's causing the chugging problem or not, but it won't be helping.

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