Skip the auto shop - Our mechanics make house calls

Q: My car idles rough and surges i

asked by on

Hi my name is Brian and my car it idles rough in at surges at a stoplight but when it drives it's OK what do you think the issue is and how to fix this issue thank you

A: In your case, the most likely cause is that...

In your case, the most likely cause is that your EGR valve is partly stuck open or your engine has a vacuum leak. Either of these things will cause the engine to run rough at idle but runs okay above it. If you cannot find the vacuum leak or EGR problem, I would suggest having a certified mechanic from YourMechanic inspect and fix your rough idle for you.

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: Car stalled while driving.

Hi, thanks for writing in. I recommend having the charging system (battery/starter/alternator) checked properly. While it was fine to check older cars by disconnecting the positive terminal while the car is running, you're asking for trouble doing that same test...

Q: Seems like a belt squeal upon cold start and gets louder with acceleration. Stops after the car is warmed.

This may be related to a squeaky belt. In cold weather these belts will make this kind of squeal when the rubber belt material is cold. The cold weather causes rubber to be less pliable and a bit brittle. As...

Q: Alright my daughter brought her car in for oil change they said CV axles were bad needs new tires too. How to diagnose CV issue

The oil changer may have seen the CV axle boots torn open. This would allow the lube to be washed out of the joint and dirt and water to enter and damage the joint. You would not hear any noise...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...