2009 Silverado RPM's Fluctuating.
#1
2009 Silverado RPM's Fluctuating.
I have a 2009 Chevrolet Silverado 1500 LT Z71 4x4. Purchased the truck with 38,000 miles on it. I now have 58,700 miles on it. About 6 weeks ago, I started the truck and let it warm up about 15 minutes due to the extreme cold. I started driving it and put it in cruise control at 58 mph after about 8 miles of driving. I noticed that the RPM gauge would fluctuate between 200-300 rpms from 1500 rpms to 1800 rpms. It would stay at 1800 rpms a few seconds and then drop back down. It is doing this on a consistent basis. Doesn't seem to do it when not in cruise . The check engine light isn't on. I have had it tested for codes and no codes are showing up. The dealer said it was the AFM that was causing the fluctuations. However, it didn't do it when I first acquired the vehicle. Also seems to be cold weather related. Any ideas would be appreciated.
#2
Figured out problem.
The research I did led me to believe that the Active Fuel Management was acting up. I have since taken care of the problem. My mpg went up as well. I will not be purchasing another vehicle with Active Fuel Management. In my experience, they don't do what they say and more people have had to rebuild engines over it failing.
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