There are many parts that have to be removed, so if they need replacing do it then to save money since you already paid the labor. This will probably cost you about $1500++– once all said and done. You will basically be rebuilding the top half of the engine (although bottom half will still be original) You want a complete valve “grind” or replacement, a magna-flux (checks for cracks) and a resurface of the cylinder head surface done. If it is just 1 cylinder with no compression, but the other 3 all have normal compression AND there is no knocking noises coming from inside and underneath the engine….I would pull off the cylinder head and send it to a machine shop for a valve job. I would first get a second opinion from another mechanic, unless you really trust this one and his diagnosis. Mechanic thinks something internal broken and has suggested we not repair as it probably involves replacing the engine (rebuild would be equally costly.) Any thoughts? I have a Ford Focus with 135,000 mile son it and was told today that the #2 cylinder has zero compression.
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