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2008 6.2 No Compression in two cylinders
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Question
mbfireboat
My 2008 Yukon Denali with 105K miles suddenly started running really bad this week. The traction control/stabilitrac light came on at the same time.
I took it to a local shop which said I need to take it to a dealer. They felt possibly it was a bad fuel pump module (which has physical damage) and a new one would have to be programmed by the dealer.
I drove it a few miles to Williamson Cadillac here in Miami. The service advisor called me the next day and said that diagnostics points to no compression in cylinders in 2 and 4. He said that he has seen this several times before with the 6.2 where it is a broken valve spring. However, it will be a week before they can fully check out the engine.
I have always cared for my Yukon with regular maintenance and do not drive it hard.
Obviously the engine is out of warranty but I was wondering how big of an issue is the broken valve and/or spring with the non-AFM 6.2 engine?
I haven't seen much on the internet as everything seems to be related to the AFM engines.
I am hoping it is just a simple valve spring replacement but I am aware that if a valve dropped and hit a piston, I am looking at a new engine. I'll keep you guys posted as I find out more. Thanks.
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