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'02 GP SE - hesitation at very low speed

B

Brenky

New member
I'm having an issue with my Grand Prix that seems a bit unusual. For the past month or two, after driving to warm up the car a bit, it "hesitates" at extremely low speeds (less than 10km/h) when trying to accelerate. A more specific example is if I'm in heavy stop-and-go traffic and I brake/coast to almost a standstill, wait a few moments and then try to accelerate, it hesitates for a second then "clunks"/lurches forward once it gets enough gas. It almost feels like it's going to stall, but it doesn't (or hasn't yet...). Strangely, this does not happen when accelerating from a complete stop, only when accelerating from extremely low speeds. If I accelerate very gently, the symptom disappears or is significantly lessened. It gets worse after driving on the highway for a while.

I replaced the camshaft position sensor less than a year ago, so it's not that. It did have a code for a bad O2 sensor (bank 1 sensor 2) which was replaced yesterday, that did not help either. There are no other codes in memory. Was a long shot, but the air filter was replaced a few weeks ago as well to no avail. I also checked the MAF sensor which looks clean - however, the mesh on it is crumpled in a few spots, but it's been like that since I bought the car 5 years ago. Someone did suggest to me it could be a mechanical rather than engine issue, but the fact that it gets worse the longer the drive makes me doubt that.

Anyone have any ideas for what to check next?
 


Well the egr can make mess of the throttle body and can make the butterfly sticky. It would make sense that at low speed it would or could cause some hesitation.

If in 5 years of owning the car it hasn't been done then that's where I would start since it's pretty easy to do

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Yeah, looks like it's easily accessible so I'll take a look at it tomorrow. Thanks for the suggestion!
 
I'm thinking it could possibly be a sticky brake caliper. Do you notice it pulling to one side when you brake hard? I would also check things like your trans fluid level, fuel filter & spark plugs
 
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