Q: Bucking during acceleration.

asked by on October 08, 2016

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.

Throttle Body Replacement $226.78 - $1710.92 Get a Quote
Cooling/Radiator Fan Motor Replacement $120.68 - $1412.28 Get a Quote

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

I have a 2011 Camaro. The lights come on when I turn the ignition but goes off except the service engine light

This is typically normal as the vehicle's computer goes through a series of systems checks when you turn the ignition to the on position. Once the computer is done performing these checks, the check engine light will turn off, signaling...

Car making loud clicking noise.

Hello. The 2.4 liter engine in your car does have a few common issues. It is most commonly caused be a timing chain problem. When the timing chain stretches or if a tensioner fails you will get this noise and...

Do you have to have a Catalytic converter on your vehicle in Indiana?

Short answer id Yes you have to have one on this vehicle. The longer answer is that your vehicle falls under the Federal Emissions Standard for the 2001 year. The vehicle has to meet the Federal standards and Indiana can...

The car starts only with Easy Spray

Hi there. Thanks for writing in about your 2010 Ford Transit Connect. It sounds like there may not be a crank signal occurring at the normal cranking speed. If there is not, then the engine will not start. If adding...

Car's rpm goes up and down while idling.

The power train control module controls the idle on the vehicle using different sensors and actuators. If you do not have any codes in the computer for the problem then you may have to have the computer reprogrammed per the...

A bad knocking noise on my left front wheel especially when driving on a bumpy road or when turning either left of right. 2008 VW Golf

Hi there - the suspension noise you describe could be either a broken front strut, or strut bearing plate. You are likely also experiencing a bit of loose motion in the steering as well. I would recommend a suspension inspection...

Problems with windshield wiper.

Hi, I have seen this before, and the repair is usually pretty simple. The wiper arm drive is a cone, and the wiper arm just slides on to the drive. A nut usually puts pressure on the arm down onto...

Suspension damage 2015 Dodge Dart

Hi there - possibly. While it is possible that the wheel bearing was not damaged, or damaged enough to cause a concern for replacement. However, most modern front-wheel drive vehicles utilize double-row ball bearing hub designs, and these bearings are...

Misfire

It sounds like you may have a misfire of some kind. Engine misfires can be caused by many different problems and are generally caused by either a spark or fuel issue or in some cases, a combination of both. Spark...

Related articles

Is It Safe to Drive With a Diesel Leak?
While While diesel engines aren’t as popular in the US as they are in the UK and Europe, they do have their adherents, most notably in the heavy-duty truck sector. Diesel systems are very different from their gasoline counterparts, and...
How to Repair a Leaking Car Radiator
The radiator is the start of your car’s cooling system. Coolant from the engine travels through tubes in the radiator. These tubes are surrounded...
How Long Does a Differential Gasket Last?
The The rear differential controls the rear pair of wheels so they can rotate at different speeds, which allows your vehicle to travel smoothly and keep traction on the road. If you have a rear-wheel drive vehicle, you have a...