08 Chevrolet Suburban 144000 rough idle check engine & stabilitrak light.
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I replaced spark plugs. Dealer said broke piston ring & low cylinder pressure on #3, I don't agree because they didn't scope the cylinder for scratches on cylinder wall & it's not burning oil. I switched plug wire on that cylinder & switched coil pack on that cylinder, problem still. My personal mechanic says possible lifter issues due to AFM. He suggested to add Rislone & then change oil and filter with Mobile 5w30. Or replace lifters. (Requiring pulling intake & heads) Please Help??
How long has your 2008 Chevrolet Suburban 1500 had this problem?
4 weeks
1 Reply
Adding a teaspoon of oil into cylinder - then re-checking compression will reveal piston ring sealing problems! Compression will increase if rings are the culprit .... Old school test - still works every time!
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Cylinder *leak down test* is also a very effective way for finding out exactly ‘where’ compression is being lost. Either you just don’t want to believe the dealers diagnosis - OR - you need a *mechanic* to test your engine - - one or the other.. Good luck!