Help me diagnos this weird problem...

Timmys88Z · April 5, 2002

Ok today while in the drive-thru at lunch.... I'm sitting there with it in drive and my foot on the brake, stopped. And all of a sudden, just for like one second, the engine revs up a couple hundred RPMS and the truck lurches forward (or trys to since I had my foot on the brake, so it didnt really move much). I was like "what the #### was that?". I've never experienced that before in any car. Then a couple minutes later it did it again.

Anyone have a clue?

carguru · April 5, 2002

Did service engine light come on? It sounds like you have a throttle position sensor on the verge of going out.

siume99 · April 5, 2002

Just an idea, but was your foot overlapping the brake and accelerator? Other than that, I have no idea.

Timmys88Z · April 5, 2002

Well I didn't notice any service lights come on, but it was real quick.

No I am sure my foot didnt blip the throttle.

Also, the car wasn't fully warmed up at the time, but I still don't see why that would matter.

Shaners · April 5, 2002

Also, the car wasn't fully warmed up at the time, but I still don't see why that would matter.

I bet you have a sensor going bad and the computer gets a funny reading for a split second as the computer makes it's adjustments as the engine warms up. And that is my $0.02!!!

Colorado Kid · April 5, 2002

Did you have either the A/C or Defrost on? It could have been just the compressor cycling off, and the idle speed regulation taking a split second to catch up and close down the throttle a little.

Timmys88Z · April 6, 2002

No air at all was on...

95Yukon · April 6, 2002

It could have just been a sensor or computer "hiccup". If it does it again or continues to do that, you may want to get the system checked out. Only problem is, if the technician can't duplicate the problem and catch a snapshot on the scan tool at the time it does it, they may end up replacing each sensor one by one until they find the right one.