To help a friend of a friend, I’ve offered to do a basic compression check on a 22R engine, '85 Toyota pickup, which is apparently low on power, won’t go above 50 mph. Yes it could be a multitude of things. Chances are it’s several of them.
I have not yet heard it run. I’ll consider myself lucky if I hear the uneven cadence of running on three cylinders.
My job Tuesday is to screen it for the most obvious things like a clogged air intake or air filter, choke stuck closed, worn spark plugs, etc, and do a simple compression test. I will again try to persuade the owner to take it to the skilled mechanic I’ve recommended, which he has resisted thus far, even though he’s about to set off on a long trip through desolate terrain.
I already suspect low compression based on what the owner has implied, but also wondering about ignition timing and vacuum advance. This is a carbureted engine, so does that mean that it also has a distributor and needs to have the timing set? I have a timing light, but only vaguely remember the procedure…disconnect vacuum line from carb and plug hose leading to distributor? Anyone know if there are marks on the harmonic balancer to align?
Evidently it has a bogus exhaust system too - no cat - making me wonder if there’s a problem there.
I’m not going to get too deep into this, but if I can at least spot the problem I want to be able to convince the owner that there’s a clear explanation, so he’ll get it resolved.