Question about 2001 Chevrolet Impala

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No power under acceleration - 2001 Chevrolet Impala

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  • Cody
    Cody Apr 15, 2014

    You need to scan your PCM to see if you have any DTCs stored that might indicate where the problem is coming from.

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  • 7 Answers

Check for a fuel constriction in fuel filter if ok check fuel pressure if ok check catalytic converter(s) by loosening front pipe(s) from exhaust manifold(s)

Posted on Apr 14, 2014

Testimonial: "i installed new fuel pump,fuel filter,checked cat,still the same - no power under acceleration"

  • steve wilbur
    steve wilbur Apr 14, 2014

    thank you for helping

  • steve wilbur
    steve wilbur Apr 14, 2014

    i added injector cleaner to the tank,also cleaned the maf sensor still no difference. funny though i unplugged the maf and the car started strange i thought

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3 Answers

Was having a slight hitch when accelerating up hills then the other day my cat got red hot and it would barely run, now i fixed the cat problem but it wont start, any tips?


When the engine really got hot is there a possibility you may have over expanded some parts and now the engine is sort of tight and is not spinning fast enough to start.

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You sure filter is facing flow correctly?:I'd check that first,some cars/trucks have in-line filters.

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Could be fuel or ignition.
If the coil or ignition is weak, you may not have enough power to fire the plugs under load.
And if the fuel pressure is low, you may not have enough fuel under load.

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You will need to have the fuel pressure monitored under a load with a special tool and also drive it for a while and see if the check engine light comes on, if it does have the system scanned and diagnose the codes received.

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Replace the the spark plugs and wires. That sounds like a faulty plug wire(s). **Please rate me on this answer**

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Possibly a plugged catylitic converter. This can cause to much back pressure and that will cause the engine to run poorly under acceleration or loaded conditions.

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1 Answer

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Also check power steering belt under steering column, and also the rotor and chain, thei do not make whining noise , but can make noise when accelerating.

The belt is first suspect.

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