Quote
My 22RE('91,R Cab) knocked big time w/ 87 octane, minimally w/ '91 octane, then the long block was replaced w/ rebuilt at 160K miles, using all the old engine control/fuel systems, etc. Spark knock IDENTICAL as before, thereby proving that, in this case, it had nothing to do w/ "carbon buildup" in the cylinders. I like the "crud in the EGR tube" idea...
Incidentally, when I drive around at higher altitudes not in CA(Utah,etc) the knock goes away. Just repoting the facts over here.


Wonder if you could be running lean at lower altitudes and causing excess heat and pre-ignition. Then as altitide increases you in effect become richer due to less dense air and the cylinder temps drop getting rid of the pre-ignition. Wonder if you may be having fuel pressure, or flow problems.

1995 4Runner Limited V6 3.4 Liter 5 Speed 4x4
1995 4Runner V6 Auto 2WD