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.

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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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Throttle hesitation

Is the check engine light on, and have you checked fuel pressure with a gauge ?
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The throttle position sensor needs to be replaced.

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Hesitation upon acceleration

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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Hesitation upon initial depression of the accelerator from almost any speed

if the car does a nosedive then this will not help....
the autobox is a fuzzy logic,computer controlled unit that,will try to make you drive more gently(eco)the pedal position/roadspeed/air temp/humidity and load all play together to change up/down when it feels like it(almost)if you drive with a heavy foot it will learn to change higher up the rev range(more fun/fuel)if you drive gently this will feel like its hesitating(split second)try pressing down about an inch on the pedal
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sound like throttle position sensor.have it check out.also check air duct connected to mass air flow sensor and throttle body.if air duct is loose or will cause severe hesitation.

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Hesitation on acceleration engine runs fine otherwise

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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Vehicle hesitates when you accelerate .

make sure you have the correct spark plugs(2)check the throttle position sensor on the car,as most people would be driving about with the throttle on the floor car feels fine.but as in normal driving anyone only uses the first half of the pedal and this is where most wear takes place and sometimes causes hesitation when of luck.

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