Q: Misfire in cylinder 6. GMC Sierra 1500.

asked by on

Replace coil pack,fuel injector, spark plugs, wires. Engine light is on and have rough idle.

My car has 99000 miles.
My car has an automatic transmission.

Hey there. You need to have the engine compression tested to see if you have a leaking valve or rings. You could try to have the combustion chamber cleaned of carbon and see if the problem improves. This may be due to a sticking valve or excessive carbon build up on the intake valve. If compression is low and no leaks are found, then you may have a worn cam lobe. If you would like to have this taken care of, a certified pro from YourMechanic can come to your car’s location to inspect the misfiring problem and have this addressed appropriately.

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. Misfire in cylinder 6. GMC Sierra 1500.

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: Why is my transmission slipping?

The transmission in your truck has the updated 4L60 series with a heavier duty forward gears and thrust bearings so your transmission problem is most likely the torque converter or front pump failure. The clutch materials in an automatic transmission...

Q: I heard a ticking sound when I accelerate and my engine light blinks for few seconds the just stays on. What could be the cause of

Your vehicle may be experiencing engine misfires. Multiple misfires can cause the noise you are describing and if the misfires happen long enough, the check engine light will start to blink to warn of catalyst damage. Typical causes are the...

Q: Q: Transmission not shifting properly

What you are describing is often a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer...

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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.