2011 Tahoe questions
I'm looking at a 2011 Tahoe Flex Fuel, 4wd LT. It has 87k miles, no dents, dings, scratches. Sunroof and a ton of extras. It belongs to a local who bought it at auction recently. No service record...
Forum Discussion
Bionic Man wrote:
The biggest downfall of that vintage seems to be problems with the active fuel management (cylinder deactivation) which can lead to BIG problems with the engine. Not sure how to check that out, but with the 5.3 you should look into it.
Mostly correct. The issue was specific to 2007-2009 5.3 engines. It was fixed in the 2010 5.3s. The gist of it is that the 4 cylinders that would get shutdown have a different kind of lifter. In some cases a lifter would collapse throwing a miss code. The fix was a new set of lifters that don't have the issue. Burning oil is a symptom but not necessarily an indicator that a lifter will fail. There is a TSB on the issue. That was the old GM. It should have been a recall.
Having a 2008 5.3 myself I've done a lot of research on this and the problem actually only affects a small percentage 5.3l engines.
covetsthesun wrote:
Ahhh. You might want those 4 cylinders back when you are in hill country.
Actually Active Fuel Management only kicks in when cruising on a flat hwy. In the wind, on hills, accelerating, towing, it'll be in V8 mode. The DIC (driver information center) has a readout showing real time MPG and V8 vs V4 mode.
