Skip the auto shop - Our mechanics make house calls

Q: Bucking during acceleration.

asked by on

Hello. I have two issues with my car. First issue is, while driving if I where to go over say 30 - 40 mph, the car would buck until I let go of the gas or accelerate out of the jumping then it would be fine, until I slow and start speeding up again. Sometimes the bucking would occur at higher speed as well. I don't have a check engine light on for this problem.

The second issue is my engine cooling fan and my auxiliary fan doesn't run on its own. I don't have any overheating issues with the car although, I can only use defrost/air condition while car is moving otherwise I would get what I think it's refrigerant shooting out the front of the car.

Any help on this would appreciated. Thank you for replying

My car has 111000 miles.
My car has an automatic transmission.

A: Hi there. It does sound like you have sever...

Hi there. It does sound like you have several different problems going on here. The bucking is usually the result of a failure in the throttle position sensor or the air flow meter. Both of these will commonly cause these same symptoms on this vehicle. I usually check these with a scan tool to make sure they are fine. It can also be a transmission problem, but that is not too common on this car. As for the fan, most of the time this is a failure in the fan assembly itself. The fans fail and will no longer turn on. It can also be a problem with the circuit so I usually test the motor for the fan first and then diagnose the circuit if the fan is fine. If you want to have this bucking and this cooling fan problem checked, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Where is the Abbient Air sensor located?

The ambient air temperature sensor is located mounted to the left side of the under hood.

Q: My car is cranking but will not start,was told its the camshaft sensor.

Hello. This may be caused by many different issues, however, the camshaft sensor is one of those possibilities along with the crankshaft position sensor. There are few other possibilities, such as bad coils, spark plugs or potentially a fuel delivery...

Q: Car overheating and leaking oil

Hello, the first thing to do is check the oil level and get that correct and then diagnose the overheating concern. It will probably need to be jump started to get it going. The cause of the overheating must be...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...