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.
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
"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."