Q: My car has idling problems that come and go

asked by on

Hi, Recently I have been having troubles with my car, I have spoken to the local mechanics about this and they are honestly quite useless and didn't seem to have any idea. Anyway, my car has a 2.4 litre Mitsubishi petrol engine in it. - 90% of the time it will start and run fine however the idle is never consistent. - The other 10% the engine will either start and then die immediately, or will surge anywhere from 250-500 rpm. Pressing down on the accelerator will keep it going however as soon as I take my foot off the engine will stop again.

I would like to know what could cause this. I have replaced spark plugs so I don't think it would be that. I have also cleaned the throttle body out.

It has also been suggested that a vacuum leak Could cause this. There is a high pitched whistling noise coming from the engine but I cannot find it.

A faulty o2 sensor has also been suggested. But really I am at a loss to explain.

Any help would be much appreciated.

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. My car has idling problems that come and go

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: Q: Loud noise when accelerating

A flex pipe is designed into the exhaust system to allow movement between the exhaust and the motor. Over time, the flex pipe can rust out and break. Bad motor mounts can also allow excessive movement between the exhaust system...

Q: Rough idling after new water pump and head gaskets. What now?

You have covered nearly all of the symptoms of what is normally a blown head gasket. Occasionally, when the computer reads a series of codes related to one issue when another is not immediately present and then the trouble codes...

Q: No heat coming out when heater or defroster is turned on

Hello there, a variety of faults will cause your 2011 Chevrolet Silverado 1500 heat to not work with the defroster. If the heat works from other vent settings than it is likely an AC blend door motor is faulty. If...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...