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AZTEK GARAGE (Peer Support) => POWERTRAIN/PERFORMANCE UPGRADES => Topic started by: slimbobaggins on August 25, 2016, 10:58:53 AM



Title: Unintended acceleration- attempting to push through brakes
Post by: slimbobaggins on August 25, 2016, 10:58:53 AM
Hi folks,

This is actually a question about a Buick Rendezvous, but fan support for that model is poor, so I'm hoping someone here might be able to help me.

I've been called to troubleshoot a 2005 Buick Rendezvous that is suffering unintended acceleration.  The family friend reports that sometimes when breaking the engine speeds up, and the car attempts to push through its brakes.  It happens at random, and isn't intentionally repeatable.

Last night, she said that it happened for the first time while cruising.

Internet searching is a dead end for me.  Off the top of my head, I'm thinking TPS, IAC, or throttle body vacuum leak, as culprit.  I'd considered the possibility of a brake booster vacuum leak, but that wouldn't explain accelerating while cruising.

Anyone have any thoughts or suggestions? I can't find any report of this online.  If anything, it's usually the opposite... having trouble accelerating.

Thanks,
Jim


Title: Re: Unintended acceleration- attempting to push through brakes
Post by: aztekmarathon on July 23, 2019, 12:05:36 PM
I had a similar issue but mine also would not coast to a stop as if the throttle was stuck open. I found the TPS was the problem. Replaced that and a few miles down the road it ran fine.


Title: Re: Unintended acceleration- attempting to push through brakes
Post by: aztekmarathon on July 23, 2019, 12:06:45 PM
Mine would do this but also it wouldn't shift properly while accelerating. I replaced the TPS and it stopped.