My 2005 chevy impala is running at an extremely high idle after i start it. i can sometimes turn it off and restart it and it idles normal. after i drive it a while the idle picks back up on its own causing the car to accelerate when i'm not depressing the pedal. could this be the throttle position sensor and if so where is it located on this model?
A temp sensor out of range giving a false cold reading can cause high idle . A MAP sensor can also cause high idle by advancing the timing resulting in higher idle .
SOURCE: IDLE PROBLEM
Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: how do i adjust the idle on my chevy impala just replaced throttle positioning sensor
did you disconnect the negative battery terminal before changing the sensor?
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