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Pontiac Forum: 06 GXP Throttle Hesitates when idling in park
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Old August 10th, 2017, 05:55 PM
JBlast JBlast is offline
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06 GXP Throttle Hesitates when idling in park

I've got an 06 GXP with about 145k miles on it. When it is idling in Park and I do a quick punch on the accelerator to rev the engine, there is what sounds similar to a backfire, or air sucking before the engine revs. Responds instantly when driving, just does it when the car is in park or neutral. I was thinking maybe there's a problem with the throttle position sensor. Or, maybe the intake. It has a K&N cold air induction unit on it. Stock exhaust with Magnaflow knockoff mufflers.
Anyone have any insight as to why it does this?
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Old August 10th, 2017, 06:48 PM
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melsg5 melsg5 is offline
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are you sure the computer isnt preventing you from over revving the engine?
you have no check engine light on and no drivablity issues.
exactly how many rpms are you hitting when you do this rev in neutral or park?
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Old August 10th, 2017, 06:59 PM
JBlast JBlast is offline
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Quote:
Originally Posted by melsg5 View Post
are you sure the computer isnt preventing you from over revving the engine?
you have no check engine light on and no drivablity issues.
exactly how many rpms are you hitting when you do this rev in neutral or park?
No check engine light. Not revving more than 3k rpm. Just enough to hear the exhaust rumble and show off a bit to friends. If I ease into it it is fine. It's just a quick, maybe 1/4 stab on the peddle. The car is still new to me and I'm still feeling it out a bit. Have not been driving it hard. Took it up to 100mph(backed off as soon as it hit 100) the other day after I cleaned and oiled the air filter. Thought that might be the issue as the filter was so dirty it was a wonder it was getting air at all.
Haven't had a chance to hook it up to a computer yet, so I don't know if it has thrown previous codes before I bought it.
According to the Carfax, it has had fairly regular service since new and no reported accidents.
Hoping for some insight before I go nickel and diming parts.
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Old August 11th, 2017, 11:42 AM
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You may be chasing a non-existant problem, if it goes higher than 3k in gear then there is no problem other than the rev limiter preventing you from damaging your engine in park and neutral .
Becareful with oiling those filters, the oil can cause issues.
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Old August 11th, 2017, 02:33 PM
JBlast JBlast is offline
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Originally Posted by melsg5 View Post
You may be chasing a non-existant problem, if it goes higher than 3k in gear then there is no problem other than the rev limiter preventing you from damaging your engine in park and neutral .
Becareful with oiling those filters, the oil can cause issues.
Good to know. I was pretty light on the oil. Instructions said to spray until the filter had a red hue. Seemed a bit excessive, so I kept it light.
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