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Hesitation where car felt like it bucked, check engine light went on

Engine stopped while idling normally. after restarting and accelerating, transmission hesitated at about 20mph, no dash lights came on. next day, while accelerating onto freeway, car hesitated at about 40mph and check engine light came on and is constant. hesitation felt like car bucked. I have no code reader so, any ideas as to the problem?

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Go to an Autozone or Advanced Auto and have them read the code for free. The problem can be anywhere until you know the codes.

Posted on Feb 13, 2014

  • George Hernandez
    George Hernandez Feb 17, 2014

    found pcv valve stuck with oil sludge. cleaned the valve and the line leading to it. drove it for a few miles and check engine light went off. will keep an eye on it. no hesitation after about 5 miles. i'll take it to work tomorrow and see what happens.

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SOURCE: engine light is on ,code P0171, hesitates when start driving

you will need a code reader to turn light off

Posted on Jun 02, 2009

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SOURCE: hesitation in acceleration with no check engine light

MOST TIME CAR STUMBLE OR HESITATION ON ACCELERATION YOU.HAVE A SLIGHT LEAN FUEL MIXTURE.CAUSED BY STOPPED UP FUEL INJECTORS OR FUEL FILTER SLIGHTLY PLUGGED.

Posted on Jun 07, 2010

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The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

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The battery was a red herring - it would not have anything to do with the problem.
Faulty spark plugs could cause a miss but probably not make the engine stall.
What you described is a classic example of a faulty idle air control valve or a dirty throttle body. The computer controls idle speed by regulating how much air enters the intake. It opens the control valve to raise idle speed when necessary.
I would check the control valve and the throttle body.

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