Hesitation/Delayed Take-Off and Light Acceleration Pulse (Barely Noticeable) at Low RPMs

Asked by Aug 13, 2016 at 11:44 PM about the 2006 Chevrolet Impala LT

Question type: Maintenance & Repair

Hello. Just purchased a used 2006 Chevrolet
Impala LT 3.5 V6, 120K miles, well
maintained.When pulling off from a start under
light acceleration there is a fraction of a second
delay to get going. This fraction of a second event
pulses, acceleration to hesitation, repeatedly ever-
so-slightly until a light-to-moderate force is applied
to the accelerator. At this point the pulsing
acceleration ceases and all 'appears' normal (first
to second shifting, down shifting, second to third
and so on). The problem is I don't feel comfortable
having to drive with a heavier-than-usual foot.
Along with that, I'm worried that if I let the issue go
it will get worse.

3 Answers

86,745

Could be the TPS, just for peace of mind I would have the car "live data" scanned, if it picks anything up have it repaired, the system reset, and see if that cures your problem.

Going to imagine that is a throttle positioning sensor? I've lived a couple few nightmares with scanning for issues, though always on Pontiacs. (If I get informed my O2 sensor needs replaced one more time... :P. ) Where can I get the data scanned?

86,745

Any good shop will have a scanner that can do live data, if you have a favorite then go there.

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