Cory W
Active Member
Okay, so I'm back with some new developments. I decided to start a new thread to ease some confusion. As a recap, I have an '89 Ford L9000 with a Cat 3306B and 8ll trans. When accelerating under heavy throttle, at around 1600-1800 rpm, the engine loses power sometimes to the point of stalling. Shutting the engine off and restarting "fixes" the problem until the next time it's placed under heavy load, rinse and repeat. I discovered this morning that the air/fuel ratio control seems to be the culprit. Engine running with the rear cover of the AFRC removed, I activated (pushed in then released) the plunger. Engine is slow to rev, replicates my on-road no power condition. If I hold the plunger in, like it's receiving boost pressure, engine revs freely and runs good. If engine is started and AFRC isn't activated, it also runs normally. This is the first direct correlation I've found with my problem, so I'm excited to say the least. I'm currently running a new pressure line from manifold to AFRC to eliminate a possible blockage in the original steel line. Anyone familiar with the AFRC operation that could shed some light on this? Thank you!