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My dad has been battling with a GM dealer in Maryland for about 2 weeks about his car. He was driving it under heavy acceleration and all of a sudden the engine started running really bad and then just shut off. The dealership said it was because the cat converter was plugged up which I found hard to believe so they replaced it under warranty because the car only has 70K on it. So after they replaced it the car would still not run and they said that the converter would not be under warranty anymore because of this other internal engine failure. I am a mechanic but I live in PA, 5 hours from this dealership, so this past weekend I made a special trip down to look at his car. There was NOTHING wrong with the old converter, no melting or discoloration at all. So I got GM involved with this issue. However, the car does have quite the engine rattle and will not stay running with out giving it gas. I used to tech 2 to look at the misfire graphs and it has a dead miss on cylinder 2 and 5. The only thing that those cylinders have in common is the coil pack, 5 and 2 are on the same coil it looked to me. Do these engines have many internal failures??? I have searched and not found alot. Thank you for any advice or suggestions.
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Any codes? What are they? What else has been replaced? If the those misfires are populating the code for random misfire, then replace the coil/module and go from there. Never known of the 3500 having internal failures... although the rocker arms can come lose and cause issues due to improper torque specs. Try pulling the vc'ers and see of any parts dangling around in there.Lifting my front wheels, one jack at a time. -
p0300, thats it, it does have a dead miss on 2 and 5 though. Its the 3.9L Engine sounds pretty bad not sure if its just because its all out of balance or an internal failure.Comment
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My dad got the car back home yesterday and pulled 5 spark plug out and the electrode was completely smashed.Comment
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Finally got the engine out, it broke an intake valve spring in half.Comment
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