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?
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. 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: Will the steering column stop the dash from working?

If you have another key, try using that before investing into repairs. The most likely problem is the EIS - Electronic Ignition Switch, which is common as they age. As this is a costly repair, I suggest having a professional...

Q: Service advance trac light is on, anything I can do before I take it somewhere? No mechanic experience

Hello, thank you for writing in. The first step is to scan the vehicle for diagnostic codes. You can then use those to help you figure out where to turn your attention. Chances are there has been damage to the...

Q: Head gasket, alternator, engine

I would recommend getting a quote for each of these repairs and comparing it to an engine replacement. It would be hard to tell without seeing the vehicle firsthand whether or not repairing those two items will resolve the problem....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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.