Difficulty starting, backfiring, etc. then runs smooth when warm
Our 2000 Grand Cherokee Laredo has been with our mechanic for over a month... backfires and will not start unless the engine is revved until it is warm... then it runs great until the next day... replaced the computer (twice) and examined the engine, timing chain, everything we can think of to no avail. Please help
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Backfiring is caused by unburned fuel igniting in the exhaust system, which could be the header, catalytic converter, muffler or exhaust pipe. Red hot is caused by the burning fuel. You either have a timing issue or you are not getting enough air flow into the fuel injection system, which can happen for several reasons. I would try to find a good local mechanic and pick their brain.