Skip the auto shop - Our mechanics make house calls

Q: Rough idle on car

asked by on

My car is idling roughly.

A: Hello. The most common cause of a rough idl...

Hello. The most common cause of a rough idle on this engine is a vacuum leak. Most of the time this is caused by a loose or broken vacuum hose. With the engine running you can listen for any hissing noises from the hoses to see if one is leaking. If nothing is found then it may be due to worn spark plugs. Most of the time if the problem is not obvious a mechanic will scan the computer for codes to see if there is anything saved in the computer. If there are then that may identify where to start. If not then the computer data from the sensors would be looked at to see if it is a sensor problem as a failing is a dirty sensor can also cause this. I would typically also check to see if the throttle body is dirty. If it is then it should be cleaned first to see if it solves the problem. Have a certified mechanic diagnose your car’s rough idle to have this problem solved accordingly.

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: How Do Fuel Injectors Get Dirty?

The gasoline we buy at our local gas station may look golden-clean but, in truth, by the time it reaches the fuel injector, it has come into contact with impurities that will over time coat critical areas of the injector....

Q: I have had to replace my fans twice with in tqo months time they keep burning up!!.what could be causing this?

Wow, that must be frustrating! I have a couple thoughts on your VW fan issue. First, I'm wondering if the fans are sourced from VW or are a lesser quality than original equipment. Secondly, I'd be interested to know...

Q: Do you have to remove the engine to replace timing chain cover gasket and water pump?

Hi there: In short, no; you don't have to remove the engine to replace a timing cover gasket or water pump on a 2000 Ford Taurus. You should remove ancillary components such as the radiator and some other parts in...

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...