Should not back fire upon start up. Replace ECTS and see if that helps
It's lean. You have to figure out why.
to much fuel is going to the engine for it to burn it all
AnswerSounds to me that your vehicle is off time. Check the timing on it. If the timing is off it will backfire through the carb and also if it is cross wired (firing order wrong) it will backfire through the carb.
sheared flywheel key. youtube has vids... type in mower cord backfires & you'll see instructions on how to fix it.
that's what I'm trying to find out
Incomplete combustion
Could be in need of a tune-up.
you tell me the year ill tell you why
Start and run, no. Cough, backfire, yes.
Either the distrbutor cap is cracked or broken or the plug wires are not in the correct firing order or the drive for the distributer is partially broke or the valve train is to tight.
timing is offset
If your engine backfires when trying to start and the valve timing is correct, then it could be electronic ignition unit or the pick up that causes the spark to occur with wrong timing.