Q: Rough Idling

asked by on

I had the spark plugs recently replaced but a former idling has returned. Plus the check engine light blinks randomly. The idling is very rough and there is shaking. What do you think is causing this?

The first thing you will want to do is to have any fault codes read out of the engine computer. The check engine light coming on at times should indicate that fault codes were stored. These may just be from misfiring occurring at the time of the rough idle. Throttle body deposits, sensor issues such as crankshaft sensor, or possibly an ignition coil could be why there is a rough idling. The first step is to see what faults are stored and correct those issues first. You may want to enlist the help of a mechanic, such as one from YourMechanic, who have the equipment and training to inspect your car idle problems.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Rough Idling

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: Key will not turn off engine in ignition 1997 Oldsmobile Achivea

Hello there. There are a few reasons your 1997 Oldsmobile Achieva is not turning off. The most common causes, would be a failed ignition switch, key cylinder, or a wiring fault. You may be able to remedy the issue by...

Q: Power steering failed suddenly

Hello. It is very possible that your serpentine belt has broken (especially if you've been hearing that sound for a while and it suddenly stopped. I'd recommend having a professional mobile mechanic come to your location and complete a steering...

Q: My EPC and battery light is on in my 2012 Volkswagen Jetta and it will not start.

Hello. This can be caused by a number of reasons. The EPC light will come on when the computer detects a problem within the power train system. This can be as easy as a bad sensor or a more complicated...

Related articles

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...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...