I went from the frying pan to the fire with this one.
After replacing a carb that was causing problems, hard starting,
stalling, leaking, then a fire. I wound up with a new problem.
When I let off the gas at high speed I get one single large backfire.
The other prombles are gone and the truck runs good except for the backfire.
There is a condenser mounted to the coil but the wire got burned in the fire and I am not sure what the wire was connected to. Could this be the problem? Do you know where that wire goes? Thanks

 

Is it a backfire through the exhaust or the carb? If it is through the exhaust you may be running to rich, and when you let off the gas all the unburned fuel in the exhasut gases will ignite in your tailpipe, and BOOM, big ole backfire. Check your carb for proper jetting and tuning.

 

The condensor should be hooked to the postive side of the coil. It is part of the radio noise suppression, not having it connected will not cuase it to backfire.


Brian:-)

 

The timeing is good and the backfire is from the exaust.

 

Any body know of a good source of info on stock jetting
for a holly 4Barl 4180-c????? Thanks