Originally Posted by Dustrider
98 taco 4x4 cold stalls
runs Ok otherwise, slight rough idle, just Ok power, 21 mpg
replaced or checked all engine control systems from the ECM to the fuel pump
the concensus is that it needs valves
dealer mech said compression is : #1-140/#2-150/#3-180/#4-190
valves are tight
three toyo mechanics at three dealers say that the valves on a toyota 2.7 cannot be adjusted
when I ask why they just shrug and say they cant
my manual shows the proceedure for adjusting the shim and bucket mess
will it cause any problems at 202,000 miles ?
I haven't done it on a 2.7, or anything else that is shim adjusted, but I am sure it's just a matter of following the procedure in the book. It won't hurt the motor to get the valve clearance back in spec, and it might even out the compression.
I had a 22R in my 86 Toyota truck that I had a rebuilt engine installed in. It idled rough, they guy who adjusted the valves had them way too tight. I had one cylinder with 150psi compression, the others were all at 180psi. Once I figured out the valve clearance was almost zero and had them adjusted, the motor smoothed out and the compression was 180 on all four.
The only question is whether or not you have already burned a valve from running them too tight.
Good luck. And you might want to find another mechanic if you don't do this yourself. These guys are either miss informed, or they don't feel like dealing with the shim and bucket "mess".