02-20-2020, 05:31 AM
Steve, Intermittent firing is caused by one of two components, Control Unit (brain box that runs the burner) and Ignition Coil. Having fuel coming from the exhaust pipe is caused by no ignition and sufficient fuel to run out.
The Controll Unit runs the ignition coil and fuel solenoid for 5 or 6 seconds when trying to fire the burner. So a bad coil will only have a short period of fuel to run out the pipe.
But a failing Control Unit that does not energize the coil and leaves the fuel on longer could give a good drip out of the pipe. So, my long distance SWAG (Scientific Wild A-- Guess) is the Control Unit. But this is only a guess and only replacing one or the other component will prove the correct solution.
If you can be in southeast Texas or in Baytown, TX, I can replace them till we find the failed unit and you would only purchase the conponent that fixed the problem.
All the best solving this.
The Controll Unit runs the ignition coil and fuel solenoid for 5 or 6 seconds when trying to fire the burner. So a bad coil will only have a short period of fuel to run out the pipe.
But a failing Control Unit that does not energize the coil and leaves the fuel on longer could give a good drip out of the pipe. So, my long distance SWAG (Scientific Wild A-- Guess) is the Control Unit. But this is only a guess and only replacing one or the other component will prove the correct solution.
If you can be in southeast Texas or in Baytown, TX, I can replace them till we find the failed unit and you would only purchase the conponent that fixed the problem.
All the best solving this.
Rudy Legett
2003 Foretravel U320 4010
ISM11 450 hp Allison 4000R
Factory Authorized Aqua Hot Repair Center
Southeast Texas Area