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What else can make the engine backfire thru the exhaust?

(1999 Pontiac Sunfire)
in Cassopolis, MI on August 06, 2016
Had a new timing chain put in a Valve job done. She still backfires thru the exhaust. She is so far out of time the garage says new engine.The head is good yet.
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Popular Answer
on August 08, 2016
I would have to think with a Back fire that the timing is off. There are a lot of things that can cause a backfire but timing is number 1.
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on August 08, 2016
How far out of time can they get? Is there a way to see how far it is out? The block isn't cracked.
on August 08, 2016
Vacuum leaks can cause it. Old or bad Tune up parts weak ignition coil Computer these are a few items and as far as timing 1 tooth off can cause problems.
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