What makes a 2001 chevy impala backfire - 2001 Chevrolet Impala

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Common GM (Plastic) part failure...

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I had s similar problem and I checked my spark plugs to make sure they were tight and alo have your timing checked an the last thing I can think of is check and make sure your vacuum lines are noe leaking

As unlikely as this may be, it may have jumped time. The engine has a timing chain, not a belt....but they can still fail (normally the chain tensioner). A compression check will tell the tale. If there is are multiple cylinders that have low compression, I would suspect the timing chain/tensioner. The backfiring along with the no-start is what makes this suspicious.

Why did you replace the fuel pump? Sounds like that might not have been the issue. Timing is what causes a back fire. The timing could be off from the crank sensor or it could be a lot of other things.

A backfire is the result of a timing issue. Since this is a 6 cylinder motor, the likelihood of it having a timing belt is slim. Therefor if it has a lot of miles on it, the timing chain or gears are worn, the cam is bad, the valves are bad or it has a problem with the crankshaft sensor.

i have a 2001 chevy impala and my air blow but it will not get cold what could be the problem?