Skip the auto shop - Our mechanics make house calls

Q: My Check Engine Light is on and my engine misfires

asked by on
  • Had the warning light checked. comes up misfire cylinder #2.
  • Runs fine when it's cold. runs the worst when it's warmed up.
  • Chevron gas treatment makes the problem go away.
  • it been like this for YEARS

my guesses - plugs - coil pack - fuel injector

My car has 180000 miles.
My car has an automatic transmission.

Hello there. Many common faults could cause your vehicle to have a cylinder #2 misfire. The most common faults are the spark plugs, spark plug wires, coil, fuel injector, a vacuum leak, or low compression in the #2 cylinder. Given that the gas treatment temporarily fixes the issue, it is likely that the fault is on the fuel system side. A qualified technician, such as one from YourMechanic, will be able to diagnose your engine misfire and make any repairs required to get your vehicle running normally again.

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!
  1. Home
  2. Questions
  3. My Check Engine Light is on and my engine misfires

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: Hi. I o I've got various codes to do with air flow to the engine. I changed all spark plugs and the main air sensor with no result

Hello, and thank you for writing in. There are several air intake and exhaust sensors that your codes may be pertaining to. Without the actual codes to help diagnose the problem it is difficult to tell. There are air intake...

Q: The Check Engine light flashes when I go to give it bunch gas and feels like it misfires 2002 Chevrolet Silverado 1500

Hello - first task is to retrieve whatever problem codes are tripping the Check Engine light. Most auto parts stores will do that for you for free. Without that info, I suspect you have a weak spark plug or ignition...

Q: EGR P0404 code accelerating. 2005 Buick Terraza

For this code, there is a related technical service bulletin 06-06-04-003D dated March 20,2007. The TSB calls for installing a new EGR kit consisting of a new valve, tube, and wire connector, and directions to reprogram the powertrain control module....

Related articles

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...
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...
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.