1999 Toyota 4Runner Q&A
1999 Toyota 4Runner Question: Low engine compression
1999 4 cylinder 4 Runner... With 239K on the original motor.. Well I just put a new exhaust manifold on it.. and its runs better.. had a mechanic check the compression and it was bad.. #1 cyl..90 #2 cyl 90, #3 cyl 100 and #4 cyl 175.. Now.. He is telling me that they should all be at 175, and that doing a valve job will only make it worse. It has never had a valve job with 239K on it.. I am willing to take a chance. He said that the engine will "fall apart".. So my question is.. should I do that valve job or just drop in a rebuilt engine?? Thanks!!! - kgdurra
I would check the valve clearances first see if any valves are pre loaded (no clearance). Cylinder leakage test is a good test off an engine. Each cylinder is tested in turn at top dead center (valves closed) air pressure is put in each cylinder is checked to see how much air escapes. Air escaping can be traced to the inlet valves, exhaust valves, head gasket or piston rings. Does your engine presently burn oil or have you religiously changed the engine oil and maintained your present engine? It hard to give advice without being able to see your engine and hear it run. Doing a valve job and getting it to seal properly will not do anything to help worn piston rings or a worn cylinder bore. Get another opinion and way up the pros and cons then. - patrick mannion
kgdurra, What did you end up doing with your 4runner? I have a 2000 4cyl with 124K that is having the same problem. I was basically told it needed to be re-built. - mtndog
What should engine compression be for 1992 toyota 4runner? I did a test and got 60-80
I have low compression on cyl1:75lbs cyl2:155lbs cyl3:105lbs and cyl4:175lbs. When the truck is idling and I remove the cyl1 wire it make no difference. And after I drive for a little bit it smells...
car runs rough and smells like something is burning after driving just a few miles. It has been smelling for a while. The check engine light has come on and off three times in the past few months...