ImpalaWhile undergoing many facelifts in its history, the Impala has proved itself to both civilians and police forces as one of the most capable 4-door cars GM has ever offered. Currently moving towards its 10th generation the Impala is one of the longest lasting and popular models.
I am having a problem with my 2007 Chevy Impala Automatic LT. And I hope someone can help me out with finding the answer. I purchased the car preowned with 14,000 on it. About 28,000 I noticed the RPM's are sitting up higher when starting the car and even while idling. I took my car in to get the 30,000 mile service done and told the tech about the high RPM's and they told me I would have to come back and talk to the tech person that takes care of transmissions. So that's another appointment I have to make.
So anyones input would be great.
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For up to the first 30 second of start up especially when cold the PCM will be in open loop. While in open loop the idle will be higher. If after this period the idle is up then something is definatly wrong. If not then it is normal. If it is still up it absolutly not the transmisson. There are many possible causes some of which are a vac leak, bad IAC (idle air control) bad TPS (throttle position sensor).
ASE Master Tech, L1 Advance Engine Performance certified
I will not answer repair questions by PM, if you would like my input you can PM me and ask me to reply to your public thread.