Question about 1991 Toyota MR2

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Hesitation upon acceleration

I would press the throttle pedal, and then I would feel a hesitation followed by a sudden burst of boost.

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Check your air filter, fuel filter and vacuum lines.

Posted on Feb 08, 2009

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1 Answer

Engine hesitates upon acceleration


Replace the jets in the carburetor with 2 sizes larger jets and the hesitation will disappear. FIRST though, look in the carb and open the throttle with your hand at the same time to see if fuel is being squirted into the venturi's, if not then you need to replace or adjust the squirter. This is what causes hesitation on acceleration.

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Hello/ Yes it can, but it is not the only possible cause. There could be an air/fuel mixture problem. This may be caused by one of the following: Oxygen Sensor, Coolant Temperature Sensor, Manifold Absolute Pressure (MAP), Mass Air Flow (MAF)Sensors, or the Fuel Pressure Regulator. I think that you need to get the codes from the ECU/PCM. These can be obtained from AutoZone, Advanced Auto, Pep Boys etc. free of charge. If there are no codes, you'll need to go to a reputable service center and ask for a diagnostic. They will generally deduct the amount for the diagnostic from any work preformed

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My 99 Audi A4 2.8 Quattro was havinga problem starting at times. It would idle poor upon start and then it would come up in rpm where it should be. I had hesitation from a start and after coasting for more than 5-8 seconds, the car would shake violently upon acceleration at about 1/3 throttle. I cleaned the Mass Air Flow Sensor. This helped but did not solve all my problems. I then replaced the Mass Air Flor Sensor. Little to no change there ($108.00). Lastly, I replaced the spark plugs. I bought Bosch plugs ($4.82 ea.). This got rid of all the symptoms. I had bad lugs and possibily a dirty MAF!

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