Q: Check Engine light on with a misfire in cylinder 1

asked by on

The Check Engine light is on with a misfire in cylinder 1. The spark plug and coil pack has already been replaced.

Hello. Although you have just replaced the spark plug and coil pack, there could be several things going on here. It is possible that the wiring to the coil pack is broken, there could be a broken wire somewhere, or something could be wrong with the spark plug and coil pack itself. Another possibility is that the fuel injector may not be working. If cylinder 1 is bad, you may need to replace the entire engine. I recommend having a professional mechanic inspect your engine misfiring issue to determine what repairs are needed for your vehicle.

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. Check Engine light on with a misfire in cylinder 1

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: Engine is misfiring and the service engine soon light is on.

Hi there. If the engine is misfiring you would need to check the spark plugs and fuel injectors to see what is not working. If the spark plug has no spark, then check the spark plug wire for spark by-passing...

Q: Bought cheap crank shaft sensor, now a code is coming on.

Hi - regarding the crankshaft sensor - if the new one (cheap or otherwise) is not causing any misfire, it is just fine for now anyway. What code is "still coming up"? That is fairly important in the diagnostic process....

Q: Car makes a noise when I accelerate

Some noise from these engines is considered normal, especially on cold start. The noise is often the result of "piston slap" caused by excessive piston to cylinder wall clearance. The noise goes away when the engine warms up and 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...
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...