YACT: Backfires

[Toastedlightly]

Anyone know what hte most common cause of backfiring / misfiring are on a carburated vehicle? I am tryhing to diagnose the truck.

 

[Evadman]

Timing & carbon buildup

 

[Toastedlightly]

Originally posted by: Evadman
Timing & carbon buildup

I have the timing spot on (5* advance), at least I think. I do have some old spark plugs.. think those could cause backfiring, or interferance from the coil?

 

[Quixfire]

When does it backfire?

 

[zerocool84]

ok u got the timing right then check ur plugs then clean ur carb, check the jets, clean them out, adjust it......if not.......

 

[Platypus]

carbon build up

 

[NikPreviousAcct]

Backfires most commonly occur because the engine is running too rich and the fuel doesn't all get burned up in the cylinders.

 

[Skiguy411]

That reminds me....

My lawn mower back fires like 4 seconds after I turn it off. Any ideas?

 

[Quixfire]

Originally posted by: Skiguy411
That reminds me....

My lawn mower back fires like 4 seconds after I turn it off. Any ideas?

I would suggest it's running too rich.

 

[Toastedlightly]

Hmm... the real question is how do I gauge how rich it is running? (no O2 sensor or anything) Maybe I need to adjust the floats..