Question about Chevrolet Impala

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2001 impala has a new catalytic converter, plugs, wires and new fuel filter. Air filter is clean. Car idles and runs fine with little gas. When you accelerate or even sitting idle and floor it the engine surges like not enough gas ore air.

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  • Alan Picklesimer Oct 06, 2009

    The car runs and never stalls. It just surges when in and yopu give it half pedal or more. Running it loses power going up hill or fast acceleration.

    Thanks

  • Alan Picklesimer Oct 06, 2009

    what about the ecm?

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It means that not enough fuel is reaching the cylinders. Air should be fine as you say that the air filter is clean. And if it was choking for air then even in idling it would not be as smooth and low on consumption as you say it is. Hence the conclusion is not enough fuel reaching the cylinders. Could be the fuel pump/injectors, the blocked fuel lines.

Posted on Oct 14, 2009

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This can and is most likely Caused by Idle Air Control Valve

Posted on Oct 06, 2009

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The most common cause of this is a Defective MAF (Mass airflow) sensor, the sensor is located in the rubber air intake hose to the engine, it has a 4-6 wire connector going to it, it sits between the two pieces of the engine air intake hose, the other cause of this can be low fuel pressure c aused by a failing fuel pump in the gas tank, since it takes a special tool to check the pressure suggest you have the dealer test your fuel pressure before replacing the MAF sensor..

Posted on Oct 06, 2009

  • yadayada
    yadayada Oct 14, 2009

    have you substituted a none good maf?

  • yadayada
    yadayada Oct 14, 2009

    he ECM failure rate is less than 2%, so very likely it is not the problem.

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Hi
Thanks for using FixYa. Please check for the following things as these are the thing that cause the car to idle--
1. The stall is likely caused by either a problem in the electrical system or in the fuel system. Your engine stops running because it is not igniting gas in the cylinders, this occurs either because there isn't gas to ignite, or because it lacks the electrical charge to ignite it.
2. Drive the car up and down steep hills. Does this change the performance of the engine, or cause it to stall? This might indicate a clogged fuel filter. Replacing the fuel filter is relatively cheap and easy once you find out where it's located.
3. Does the car idle roughly and stall when at idle? If your car has a distributor, you may need to adjust the timing. With the right tools and know how, this is an easy and free task. If your vehicle has fuel injection, you can check the injector by using a screw driver or mechanics scope. The injectors will make a clicking/snapping sound if working. No sound would indicate a bad injector available at most DIY auto parts stores. Also check the ICM, idle control motor that controls the air mixture.
4. If your car has a distributor, you might consider changing the cap, rotor, wires and plugs. This is effectively a tune up. This can usually be done even by a relative novice to car repair, and take a couple of hours with the right tools. It seems counterintuitive, but even the wires and distributor decay over time, and transmit less electricity. This tune up may solve your stalling problem -- even if not, your car should run better and get better mileage.
5. If your car diesels when you turn off the ignition, it often signals the need to replace the spark plugs. Dieseling describes the situation where you turn off the key, yet the car continues to run for a few seconds or longer, eventually sputtering to a stop.
6. In rare cases, your car may stall due to what is commonly called a "vapor lock". It is actually a vacuum in the fuel line that causes fuel to eventually stop reaching the engine. Try opening your gas cap. If you hear a "whooshing" sound, like when you open a can of coffee, it's vapor lock. Now try starting the car. It should work after a couple tries. This is usually found only in older cars. If you have it, this will probably happen again, so your fuel line should be checked for blockage. A cheap fix is to drill a small hole in your gas cap to allow air in and prevent the vacuum from forming, but it should not be left this way.
Please do accept the solution if the issue is resolved or else revert for further assistance. Radio Shack Pro-95 Dual Trunk-Tracking

Thanks

Rylee

Posted on Oct 05, 2009

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