Skip the auto shop - Our mechanics make house calls

Q: Valve cover and misfiring cylinders on 6 and 7 (needs a tuneup) 2011 Chevy Silverado 1500

asked by on

I was told that I needed to replace the valve cover and that spark plugs 6 and 7 were oil faulted.

My car has 142000 miles.
My car has an automatic transmission.

Hello - yes, oil leaks onto the plugs, or onto the coil boot over the plug, will cause misfires and poor running. I would recommend a valve cover gasket replacement by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, and replace this gasket, preventing future leaks and engine plug fowling.

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. Valve cover and misfiring cylinders on 6 and 7 (needs a tuneup) 2011 Chevy Silverado 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: Car jerks forward slightly everytime I hit 19 mph

Hello, and thank you for writing in. The misfire needs to be the focus of our attention. If you had moisture on the spark plugs and white smoke, then there is some kind of coolant leak. This fouling on the...

Q: Can a 12V tire inflator burn my car electrical system

Yes, it can be dangerous to plug high-current loads into the cigarette lighter! And, yes, this circuit should be fuse protected so that wiring or other components on the power path are not damaged. Not all manufacturers fuse-protect the cigarette...

Q: Engine fan keeps running

Hi There, It sounds like you have two separate issues going on. The fan continuously running suggests that you may have a faulty cooling fan relay which may be causing the fan to continue running like this. The engine oil...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.