Skip the auto shop - Our mechanics make house calls

Q: Vehicle idles poorly

asked by on

The car misses on cylinders two and four. The vehicle starts but then idles poorly. Fuel is being expelled out of the tailpipe.

A: Hello. When a car misfires, it is an indica...

Hello. When a car misfires, it is an indication that the spark plugs are not firing properly, which prevents the fuel from igniting. The misfire also causes a poor idle because the two cylinders are not firing properly. This causes the car to run on four cylinders instead of all six. Replacement of the spark plugs and coil pack will most likely be necessary. If you would like to have this issue diagnosed in person, a certified mechanic can inspect and repair your vehicle's rough idle.

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・Save up to 30%

Get a quote

What others are asking

Q: Jeep not turning over.

Hello. If the engine simply turned off and will not do anything at all now then I would be concerned that there may be an internal engine issue. If when you attempt to start the vehicle you can hear the...

Q: Battery problems with jeep

It sounds like you are experiencing an electrical charging system issue. The alternator is not charging the battery properly. A spike in voltage will blow out your headlamps, and a drop in voltage will cause them to dim. I recommend...

Q: Engine light comes on and idles roughly.

Single cylinder misfires are usually caused by ignition components which is where I would start with on this car. Verify the ignition cap and rotor are still in one piece and that the wires are not arcing losing spark. Have...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...