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Just to confirm, these are vibrations from the unibody under you while driving, or the steering wheel or what. 70 is when unbalanced wheels and driveshafts peek out their ugly faces.

Hey everybody, I have been following LVC for some time now, since at least 07 when I got my mark. 97 mark VIII. I have followed LVC, as well as the other sites which I'm not sure if I should name em, but lincoln forums none the less. Anyway, I posted questions well into the night yesterday and...

Yeah you were right 'right on the mark' about the plug, I thought it could enter further into c.chamber with no threads left but I don't think so now after re-inspecting. Maybe it was the valve seat issue you mentioned because the plug was chewed up. The piston was marked up at the bottom near...

Well no need to pull the head. I heard air coming out of my crankcase during leakdown test. : ( I think you were right about the valve seat problem. I can't really get a good shot back up at the head with the borescope. Thats what must have chewed up the bottom of the plug. I thought the plug...

Yeah leak down test proved it, heard air coming from crankcase slightly, also from the exhaust. I'm guessing most of the air was exiting out the exhaust valve destruction but enough made it past the piston to get heard out the dipstick tube. Leak down is a real pain to do by the way, just...

I'll try the leakdown method for sure. My compression gauge goes in hand tight and the adapter I put into place to fix the plug hole doesn't allow it to thread in enough for a proper comp. test. Reads way low even for a bent/sucked valve or even shattered piston. Yeah the piston is banged up...

Thanks for the quick reply. I borescoped the c.chamber to make sure there were little to no debris left. Also, there was what I saw as a jagged crack in the lower crest of the piston, but my co-workers said it wasn't cracked. Either way, there was a seriously jagged edge at the lower end of the...

Hey guys, I've been researching on any Lincoln sites available for some time now. I have a 97 mark VIII, I changed my plugs about 10k ago. I have done many tune ups and know the game after 10 plus years being paid to work on cars and with little to no come backs. Now my mark not only spits a...