Skip the auto shop - Our mechanics make house calls

Q: Car bucks when I put it in reverse and drive.

asked by on

Once I put my car into either reverse or drive, it will buck even if I have the brakes on. I'm assuming it's a transmission problem but I'm not sure what it could be.

My car has 140000 miles.
My car has an automatic transmission.

A: Check your idle speed. If your vehicle is i...

Check your idle speed. If your vehicle is idling too high, it will buck when you engage the transmission. Your idle speed in park should be around 500-600 RPM's. If you are noticing the RPMs to be higher that usual, then you should have the bucking issue diagnosed by an expert, as the potential causes can range from bad transmission fluid to a clogged fuel filter to a faulty idle control valve.

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・Save up to 30%

Get a quote

What others are asking

Q: Timing?

Normally, when the headers start to glow, it is a sign that there is a restriction. Typically, the headers will not begin to glow until high rpm's are reached, which from a theoretical standpoint, are telling you that they are...

Q: How to set the idle

Hello there, thank you for asking about your 1986 Ford V8-5.0L. The throttle body and idle air control valve should be cleaned first. The idle is not adjustable on this vehicle but the throttle stop on the throttle body can...

Q: car starts fine but stuck in park wont shift

The first thing to check is to have someone look at your brake lights when you push the pedal. If you do not have brake lights, then the brake light switch is bad or one of the wires at its...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.