Skip the auto shop - Our mechanics make house calls

Q: Sporadic misfiring, check engine light on sometimes

asked by on

My car has been misfiring sporadically during driving. It occasionally occurs when I start the car as well. The dash sometimes shows the check engine light on. I had the spark plugs replaced. The coils are replaced with new ones as well. The mechanic ran diagnostics, and there are no codes related to cylinder identification. What should I do?

A: Hello there. If there is no cylinder specif...

Hello there. If there is no cylinder specific misfire codes, it may be a random misfire situation. Without the exact code, I cannot give a precise answer for your specific situation but can offer a possibilities. The most common causes of a multiple cylinder misfire are the camshaft position sensor, fuel pump, crank sensor, fuel line, or an ignition fault. A qualified technician, like one from YourMechanic, will be able to diagnose the misfiring issue and perform any repairs required. Given that the fault is intermittent it may take a few attempts for the fault to be duplicated.

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: Car started vibrating a lot

Hello there. The LX470 does, in fact, take premium gasoline. When a lower octane is used such as 87 unleaded than there is a possibility for the engine to knock. In most cases, the vehicle's computer will adjust to the...

Q: Engine shuts off, white smoke coming out - 2001 Toyota MR2

Hello. White smoke (steam) makes me think that this is antifreeze. Check to be sure your radiator coolant level is not dropping. If so, could have internal leak to cylinder. A misfiring cylinder is caused by mechanical problems or an...

Q: Engine misfiring in the sixth cylinder on a 2009 Ford Edge

Misfires can be caused by many things, but at least you know it is in the cylinder number six. What I would try next is to swap the ignition coil from six to one, and one to six. If the...

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...
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...
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...