When acceleration the car bucks

Tiny
NYCTAXI2N52
  • MEMBER
  • 1995 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 127,200 MILES
Hi I have 1995 toyota corolla when acceleration the car bucks I had a machanic look at it and he said I needed wires, spark plugs, rotor, and distributor cap that was all done, but it still does the same thing what could I do?
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Friday, May 30th, 2008 AT 9:25 PM

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Tiny
SQM
  • EXPERT
Hello,

This issue can be due to a vacuum leak.
A good step would be to do a thorough inspection of the vacuum hoses. Make sure there are no cracked hoses or damaged ones.
Intake gasket leak can also trigger this type of issue.
That leak can be tested by spraying carburetor cleaner at the base of the manifold. If there is a leak the engine will react to the chemical and idle higher and will go back down afterwards.

Here is a helpful guide:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Another possibility is a bad manifold absolute pressure (MAP) sensor. Faulty MAP sensor can lead to poor acceleration, rich air fuel ratio, rough idle.

Please let me know if you have any questions.
Thank you.
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Thursday, November 4th, 2021 AT 6:57 AM

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