Q: Rough Idle Problem

asked by on

The check engine light is not on! Car idles rough at a stop at times it will shut off. However it does start back up. When I accelerate the car makes a loud rumbling and shaking noice. Car was recently tuned up due to the same problem. Fixed it for about a month. What could be wrong?

My car has 90000 miles.
My car has an automatic transmission.

A rough idle may be caused by many different things such as low fuel pressure, low voltage to the fuel injectors, dirty fuel injectors, a vacuum leak, a faulty Oxygen sensor or a dirty or failing idle air control valve. Any of these possibilities relate to fuel delivery issues that will disrupt the normally balanced air/fuel mixture that would otherwise allow the motor to run smoothly. I would recommend having an expert from YourMechanic cometo your location to diagnose your rough idle problem.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Rough Idle Problem

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: grinding noise under your right foot, because of wheel bearing bub?

Hi there. Usually this type of grinding noise as you've described is due to a wheel bearing that is failing. However, it can also be a warped rotor, damaged brake pads or a CV joint issue. It's probably best to...

Q: Q: Low idle stalling out

This suggests that the low idle problem may be related to a faulty MAP sensor since the symptoms you describe point to the low idle issue when the engine is under a load when applying the brakes at idle. The...

Q: I change my oil change oil filter fuel pump and filter spark plugs and wires distruibor cab and rotor. Truck shakes why?

If your Check Engine Light is coming on, a fault code should be stored in the ECM. A flashing Check Engine Light indicates a potentially serious engine failure. Since the situation you are experiencing can be caused by any number...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.