Hey everyone! I have an 86 Mack 550 Superliner dump with an E6 350 4 valve. One day it started popping from the exhaust that almost sounds like the Jake popping when you roll to a stop without taking it out of gear. We noticed some white smoke as well. We’ve gapped the valves and yolks 5ish times and can’t get it to come out of it. We’ve changed fuel filters as well but still hasn’t helped. Book calls for .024-.028 gap on exhaust valves and we have gone all the way to .035 and we are still getting the popping like the exhaust valve is open. What’s next? We’ve unplugged the Jake solenoids to rule that out too.
