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Originally Posted by 2005chevimpala
In all my posts of me changing my oil in my 3.4 impala and when i started her up the engine was rattleing and when hooked up to a scanner she showed multiple misfires on all cyl's,i brought her to the g.m dealer today to get her checked out under my extended gmpp warrant that covers all internal engine and tranny and wheel bearings i was told by them they would have to tear down the engine to identify the problem,it may be a burned exhaust valve,a broken push rod or valve spring or even a possible worn or collapsed lifter,the car has been well taken care of in the time i had it with reg oil changes at 5-6000 km's all the time and all the sudden the engine goes like that,g.m mech's say sometimes strange things could happen like that,work good all the time,next day the engine has trouble,will find out more on the exact problem in the next day or 2 when they start the tear down and will let you guys know what happened or what is broken so you guys can know what to look or listen for if this happnes to your impala
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2005chevimpala,
Instead of making new posts on what appears to be the same issue how about updating the original post otherwise all it does is cause possible redundant replies or confusion. Your future cooperation is appreciated. Your two posts have been merged together.
What brand oil filter was used? And are you sure the knock sensor located by the oil filter was not disconnected or disturbed.