2012 GMC Acadia. Mechanic's Assistant: Does the sensor have a wire-wrapped magnet? Here is what was done. I … As I think I mentioned before, I'd noticed some hesitation at times on slight upgrades for several months prior to that, and thus far that also seems to have been corrected by this fix. the gen 7 cars have a throtal by wire set up and you have a cable drive . Like if going but it doesnt want to keep going. While driving at a constant speed ie 45mph or 65mph the vehicle hesitates. Here are the most common causes of whining noises when accelerating: 1. The check engine light is not coming on and there is no codes available. Found P0171,P0174 for lean bank one and two. Rough idle is about the same but hesitation is getting slighlty worst. This fraction of a second event pulses, acceleration to hesitation, repeatedly ever-so-slightly until a light-to-moderate force is applied to the accelerator. No arcing observed. 1. With the 4 speed auto . Some customers may comment on an intermittent engine hesitation or flutter. The frightening part is, when I turn left or right from a stop, the car not only makes that funky noise, it also hesitates when trying to accelerate...all while my yellow lights are blinking on my dash. ECT has 60,000 miles on it. 2012 Chevrolet Impala LT 3.6L Hesitation, Surge, Stall, MIL Lamp on. February 26, 2015. I have a 2012 Impala, when I make a left turn from a stop there is a clunking and a hesitation. Kharris since yours is an 2003 im thinking yours may be a bit of a difrent issue (gen 5 car ) I belive you should have the 3.1 v6. If your Impala seems sluggish or does not want to … Oddly no "bogging" with A/C on though. Delco O2 sensors have about 60,000 miles on them. Chevy Impala Whining Noise When Accelerating. Customer complains of check engine light. 2012 Impala I have changed the sensors, changed the wheel bearings and just changed the struts, no luck. Fuel filter has about 4,000 miles on it. I replaced the wheel hub and bearing, and the speed sensor. Vehicle will run rough at idle for around 3 minutes then smooth out. Taylor plug wires have 60,000 miles on them. Just purchased a used 2006 Chevrolet Impala LT 3.5 V6, 120K miles, well maintained.When pulling off from a start under light acceleration there is a fraction of a second delay to get going. 01/26/17: NHTSA ID: 10089562 TSB ID: 14588B 14588b - special coverage (revised to add 2016 my chevrolet impala). 3. 0. jkohan Posts: 9. This condition may be caused by intermittent conditions and poor connections at the terminals in the harness ... Chevrolet Impala 2012 LFX-3.6L Bank 1 Exhaust Chevrolet Malibu 2008-2012 LY7-3.6L Chevrolet Traverse 2009-2011 LLT-3.6L Camshaft Position Sensor - The newer your vehicle is, the more components it contains that have to work together to provide ideal performance levels. A whining sound when accelerating is almost always caused by a bad accessory attached to your Impala’s engine. Bad Alternator. If so, have you checked it with an ohmmeter? on some 2011-2015 model year chevrolet caprice and 2012-2015 model year chevrolet impala police patrol vehicles, idling the engine for extended periods of time can prematurely wear the engine-cooling-fan motor. Hey guys, I have a 2005 chevy impala 3.4 base and I have a problem where I accelerate my car sort of hesitates, kinda jerking a bit. It acts like a dirty or clogged fuel filter or a slip in the tranny. .023 results in more power and better in-town mileage (avg 35mpg), but below average highway performance and mileage (37mpg). 2. .028 results in minor pinging, but no hesitation or surging. It will hesitate on acceleration. Posted to GM Driveability on 11/20/2018 11 Replies. When an alternator is going bad, it’ll often begin to put out a high pitched whining sound. Good luck!! November 2004. Hello. If your Chevrolet Impala is not accelerating properly, it could be due to any number of problems. EGR valve has 60,000 miles on it and tested good. It normal happens between30 - 40 mph right on 35mph most of the times. Asked by acadiadenali12 in Apopka, FL on . Anything over .030 GAP results in severe predetonation (pinging) under load and hesitation on acceleration.