Question about 2001 Chevrolet Impala

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No power upon acceleration 2001 chevy impala,i have changed fuel pump, fuel filter and the fuel regulator also checked cat by unhooking egr line just to chech back pressure with no change

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  • 22 Answers

Maybe a fuel injector or spark plugs/ wires are bad

Posted on Apr 13, 2014

Testimonial: "thanks for helping i dont know the last time it was tuned up but it does run very smooth at an idle"

  • 2 more comments 
  • steve wilbur
    steve wilbur Apr 13, 2014

    im thinking about trying a can of sea foam to the gas tank

  • steve wilbur
    steve wilbur Apr 13, 2014

    is unhooking the egr tube a bad way of checking backpressure

  • big moose Apr 13, 2014

    sea foam might clean some junk out but your car will smoke alot till its all cleared out.

  • hutch 1200
    hutch 1200 Apr 14, 2014

    Steve is correct. Hopefully your Cat is just clamped on. Physically disconnect it at the fron of the cat, wire it up SOLIDLY w/coat hanger wire if needed & drive it a short distance. Be aware it will be loud, and don't try to hook it up right away! Mooses idea is good as well.



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Posted on Jan 02, 2017

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SOURCE: change out o2synsor, egr valve egr vacuum sensor

replace the distributor gear on the distributor. the get worn down and sharp and the computer can't controll the timing rite. also check your tps.

Posted on Oct 20, 2010

  • 666 Answers

SOURCE: 99 monte carlo 3.1, starts and idles but stuters

You can connect a pressure tester where the fuel line goes into fuel filter, Make sure you clamp the hose to the line and tester before turning key on. You should have 45-50 pounds pressure, If not? replace pump

Posted on Jun 11, 2010

  • 5763 Answers

SOURCE: Chevy Impala 2001 w/ 3.8L engine - EGR stuck open

there are a couple of things, first make sure there are not restriction in the exhaust, i know the dealer has had to replace converters under warranty because of this problem, then theres a reflesh program for the computer due to this problem, and lastly,run with egr off make sure it clean of carbon,carbon gets stuck in pintle sets check eng lightbut carbon then blows by so when you remove egr you see nothing, well start with these good luck.

Posted on Nov 28, 2009

  • 94 Answers

SOURCE: poor fuel milage on a 1993 chevy 1500 with a 4.3

check your timming, it sounds like its out of adj.

Posted on Jan 15, 2010

  • 236 Answers

SOURCE: My 1996 chevy blazer 4.3L will not start unless I

could it be your fuel injector? uhm try using a cleaner hopefully it's just dirty

Posted on Feb 22, 2010

Testimonial: "I found out the fuel pump was bad. It was pressure tested by a mechanic at having psi around 40. It should be in the range of upper 50 to lower 60 "

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No power under acceleration 2001 chevy impala,ive added injector cleaner , cleaned maf,also checked cat ,seemed good, also replaced map sensor

well it is a chevy, its always had that problem. Haha, just kidding. But, seriously, it can be something as simple as a clogged air filter. I did all that you did on a car I had, and then, I replaced the air filter that I thought was good (reusable K&N) and it ended up being that. Try the air filter. Either replace, or clean it.

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Change fuel lines and make sure there's no air in the lines it won't run right unless u bleed it so there's no air in lines only for fuel injected cars though

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I have a 2000 Chevy impala with 131,500 miles on it. For some reason it's using more gas then normal. I had a new fuel filter and fuel pressure regulator put on it and still same thing. Can't see...

catalytic converter, egr valve, oxygen sensors. If you have that many miles on it, try loosening the exhaust before the cat converter and try driving it. If your power has come back, then it has failed internally.

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I have a 2003 chevy impala that bogs down when accelerating. Computer diagnostics are fine. Fuel line pressure test was fine, no gas leaks. No ck engine light on. Need suggestion what to do next. Dad says...

Start with the simple and replace the fuel and air filter, also check the fuel pressure regulator vacuum line and clean the MAF sensor with MAF cleaner. Start with these easy things to check and hope will bring your car back to running 100%.

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Starts fine, but then bogs out when accelerating, practicaly have to give it no gas and creep up to speed.Doesn't want to go up hills. Just replaced the cpi, fuel filter and fuel pump 3 months ago. Also...

Check the fuel pressure regulator and the EGR valve, I would check the fuel pressure regulator first and go from there. Good luck and keep me posted. Not sure what the pressure should be but thinking it's 62 to 65 PSI upon start up and should drop 5 PSI when engine running, check the vacuum line to the regulator.

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1 Answer

Fuel pressure low at pressure monitor

HI. There are some areas that will need to be checked for faults, in this case. Check the following:

1. Fuel filter- If this device is clogged, or faulty, it will decrease the flow of fuel to the injector assembly. If the filter hasn't been changed recently, this will be a good place to start.

2. Fuel pump- This device may be weak, or grounded poorly. check the ground, and all wires the link the pump to the power source. replace any corroded contacts and connectors. wires,as well, if needed.

3. Fuel pressure regulator- The fuel pressure regulator is used to keep the fuel pressure in the fuel rail consistent and change the fuel pressure depending on the throttle position. The fuel rail is in a fuel loop between the fuel pump feed and return lines. Because the fuel delivery requirements change depending on the engine's throttle position and engine loads, the fuel injection system must be able to adapt to meet the fuel requirements of the engine's operating conditions during idle, acceleration and steady cruising.The fuel pressure regulator has a small vacuum line attached to it that allows the pressure regulator to change the fuel pressure in the fuel loop depending upon the intake manifold pressure which changes as the throttle position changes. When the throttle is opened, the manifold vacuum pressure drops off, causing the pressure regulator to increase the fuel pressure in the fuel loop, which increases the amount of fuel delivery at the injectors to provide for the additional fuel needed for the engine to operate properly.At idle, the manifold vacuum increases and the demands for the rate of fuel delivery are decreased so the pressure regulator decreases the fuel pressure in the fuel loop.

1. Look for visible evidence of fuel leaks.
2. A pressure regulator can become defective due to foreign material or a ruined diaphragm.

The result will be hard starting, poor idle quality, and lack or power. Burned spark plugs can result from operating with a lean air/fuel mixture, as well. replace this device if faults exist.

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05 Impala missfire code 301 have changed

check intake for vaccum leaks,the gasket also and egr valve, thats alot of parts to have replaced without diagnosing first, if there are no fuel leaks and you said all injectors were replaced then you have a defective fuel pump, also these engines had misfire problem because of dirty injector but you replaced them so count that out. good luck.

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Try testing your fuel pump pressure then the evap canister and the EGR valve.

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We have a 2001 Chevy Impala as well.  About 3 months ago, we encountered the same symptoms.  The catalytic converter was bad and had to be changed out.  The cost, for a universal catalytic converter, was about $300 but this fixed the problem.  I hope this helps.

Jan 14, 2009 | 2001 Chevrolet Impala

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