Skip the auto shop - Our mechanics make house calls

Q: What is the cost of a cylinder head replacement and is this reasonable?

asked by on

2014 ML-350 with 102,000 miles. Have owned since 8 miles. Run solely on E-85 as indicated as an acceptable fuel. After B Service last week at Knauz on p/u check engine light was on. Tech told me they had been seeing when cars washed and they sit (never experienced it before). Checked and reset light and said nothing and sent me on my way. Next day light came one. Monday light was on, called couldn't get loaner until later in week, said fine to drive. Every fourth time starting the car would idle rough, like a miss. Could shut off and restart and it would go away. Took back in and they ran diagnosis. Determined it was #5 cylinder. Moved coil and spark to other cylinders to determine if faulty components, still #5. Tech tells me today 90% compression, but that they haven't tested it. Will be doing so and if case may need to replace cylinder head. Tells me at this mileage its expected, seems soon. Reasonable? E-85 issue? What's the cost of a cylinder head replacement?

My car has 102000 miles.
My car has an automatic transmission.

Before having the cylinder head replaced, check the compression on all cylinders. What you are looking for is that the compression is 120 psi or more and the first puff of compression is half of the max puff of compression. If the compression has checked out to be good, then check the cylinder head out with a leak down tester. This will determine if the head gasket is burned, if a valve is bent or burned, or if the cylinder piston rings are worn. If you need further assistance with diagnosing a failed cylinder head, then seek out a professional, such as one from Your Mechanic, to help you.

Sent billing question to CS for the cost of a cylinder head replacement.

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
  • Home
  • Questions
  • What is the cost of a cylinder head replacement and is this reasonable?

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: No fuel to cylinders

Hi There, It sounds like you may have a fuel pressure or injector problem resulting from dirty or clogged fuel injectors. In the case of low fuel pressure, the system may not be primed well enough to get the proper...

Q: How to adjust the rear view mirror on my Jaguar XF?

Hello. Your rear view mirror should have its own adjustment completely independent of the seat adjustment. I would refer to your owner's manual for specifics on where the rear view mirror controls are located and how they function. Consider taking...

Q: blown head gasket?

To answer your last question first, manufacturers of motor vehicles, that would include all of the army of engineers, scientists, and other high trained trained specialists, almost as a rule do not recommend the use of aftermarket "quick fixes", in...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.