Vehicle started via normal key ignition. After high idling stops for warm up, vehicle starts to have odometer needle move from 500 RPM to 1000 RPM for a steady 5 to ten minutes. In addition, event occurs frequently at long stops even after car warm. Usually, RPM may steady at about 750 or so a normal RPM setting for this vehicle. Took vehicle to dealer who kept it for a week. No correction made. Dealer state waiting to hear from manufacturer. Vehicle still have problem having needle flutter between the RPM mentioned causing undue distress to engine components. Please assist.
2012 Chevrolet Impala engine complaints
Page 3 of 3: complaints 41 to 43 of 43, newest first, as owners wrote them.
Engine makes a knocking noise while accelerating. I drove another one and the noise was even worse, that one had 15000 miles on it. This seems to be a common problem with them all. I am very unhappy with this car. I don't enjoy hearing all this noise from a new car. (now has 6000 miles on it) if I can't resolve this problem it will be the last gm car I ever buy. The dealer had me drive another new 2012 impala when I mentioned the noise, it also sounded the same. Gm definitely didn't address this problem before production.
Engine makes a ticking noise or knocking noise while accelerating , I'm very concerned with this being that this noise started the next day after I had the car home from the dealership . I'm hoping this isn't a safety concern but it sure is a customer dissatisfaction. The dealer has tried to isolate the noise and could not and said I would have to wait for the manufacturer gm to figure out what is wrong. I'm very depressed about this having spent good money on a new car just to have it make more noise that a 40 year old car , and then being told I have to wait till someone complains enough to see if it can be fixed. I been told that this is a new engine in the impala and now am wondering if this engine is going to become a problem for thousands of people like myself. I have read some major concerns from people about the 06 impala and hope this isn't where my car is headed. Any help that I could get would be very appreciated, thank you.
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