Thank you for your help. I am not able to reply without getting an error so I started a new post.
If the piston ring is not sealing what is the typical solution and cost?
If the piston has a hole what is the typical solution and cost?
If the valve is bad what is the typical solution and cost?
Thanks in advance.
- Tom
I would get a second opinion. P0304 means misfire on cylinder 4
If the compression check came back with 65 lbs as you said, then they should hve done a "wet" compression check where they pour a bit of oil into the cylinder and check to see if it's a piston ring that is not sealing or a hole in the piston. Once they have determined that, then really the only other thing it could be is a bad valve. I don't know of an instance where the engine would need to be replaced due to low compression in one cylinder. Take it to a reputable independent mechanic and pay him a few bucks to do another compression test. That way you will know for sure if it is really a problem.
"Customer states check engine light on per SBDS diagnosis and servicing code P0304. Cylinder number 4 has 65 lbs compression and should be 120 or more. We do not recommend any plug wire, spark plug or Coil Pack work done until the compression concern is addressed."