Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
You would have to at least remove the chain and re install it in the correct position and resolve the reason it jumped time in the first place. Do you know why it jumped time? Was it a failed tensioner? worn chain guide?
after they replaced the ecm, did it run normal? If you originally had jumped timing, or a severely damaged guide throwing your timing off, then replacing the ECM wouldn't have improved your symptoms.
Was it making a lot of teribble clatter and engine noise?
Ok. So to make sure I am understand correctly: One day it would not start, and you had it towed to the dealer who replaced the computer, and the car ran after that repair?
Did it seem to be running fine after they replaced the computer?
How did the first 2 repair shops determine that the valve timing was off? Did they do compression tests? Or was it just based off symptoms?
I am just trying to determine whether or not you likely had a failed timing chain.