It sounds like I have had a stuck lifter and today I decided to Seafoam the Montero. Oil Pressure was fine when I was warming it up. I seafoamed it and a bunch of smoke blew out. I took it around the block to run it through and I stopped it. When I started it back up it had no oil pressure at all. I changed the oil and filter and I am still showing zero oil pressure. The gauge does not move at all. Could of the Seafoam killed my oil pump? Where can I check the oil pressure sensor? I looked through my Haynes manual and couldn't find how to check it. Any other ideas? I am afraid to run it until I know for sure.