On the trail, noticing my rig is "dieseling" when I shut it off and no carb fan kicking on---what are best things to check first?
I put a piece of oven-wire insulation over the section that near the manifold to prevent from happening again. But Vodka Tonic kinda makes one flame-proof, too.
I’ll expand my thought process for the OP. The carb fan is ultimately needed to help cool the carb after shutdown and reduce or eliminate vapor lock…where fuel basically gasifies in the lines. So dieseling occurs before the carb fan ever turns on usually….if the carb fan does run while the engine is running then it might help. Usually though dieseling is a result of small leaks inside the carb or carbon buildup in the combustion chamber. Or a fuel shutoff that’s not shutting off. So the truck keeps running after the spark is removed.I’ll be a little surprised if the carb fan fixes a dieseling problem.
Or a fuel shutoff that’s not shutting off.
Sounds correct. I don’t know if the carb fan will turn on when engine is running or if it’s engine off only? I haven’t done any googling or diagram reviewing to answer this for myself yet.This was my suspicion. I understood the carb fan to be controlled via relay through the EC and since the ICS is controlled as well by the EC thought maybe there was a correlation for both issues in the EC. Obviously it was much easier than that with a busted wire so good there. Guess the dieseling was just coincidental based on what OP was doing with the truck at the time. But would appreciate any clarification on the carb fan control. Does that sound correct? Asking for a friend.