1991 LANDCRUISER 200000 MILES AUTO 4WD STRAIGHT ...
1991 Toyota Landcruiser
June, 30, 2007 AT 5:09 PM
1991 Landcruiser 200,000 miles, auto, 4wd, straight 6.
Engine running rough and cutting off at idle. Just replaced the plugs, but it seems worse. I checked the wires to make sure they're in the right place. All good. Any ideas?
BTW, where would I find the PCV valve on the engine?
PVC valve is the small valve connected by hose to the
back of the valve cover.
It is very common for the EGR valve to be stuck
slightly open and allowing exhaust to enter
intake manifold when idling and cold. Normally,
the ECU holds off EGR circulation with the EGR VSV
valve and EGR Vacuum Modulator until conditions
are good for taking exhaust gas. But, if the EGR valve is sticking, the computer cannot compensate
and it idles rough. It is easy to remove the EGR valve, but a bear to clean it. It has a long tube that goes inside the manifold. I use carb/choke cleaner (you may need a couple of cans, but it's cheaper than a new valve at $190).