tdcarter72

The last two afternoons driving home my truck has backfired. My question is what causes backfire? Is this something I should worry about?

96ford13

google backfire

dirtcrew51m

Check timing.

ymeski56

Cat causing a back pressure condition, injector hanging open, bad fuel pressure regulator, timing....... I would worry about it.

tdcarter72

Don't have cats, PO cut it off.

I ordered a fuel pressure tester and it should be here anyday. I will check fuel pressure and timing this weekend.

The truck has what I think is a fuel problem. It skips/surges under any touch of the gas.


Thanks for replys guys!

ymeski56

Hate to start w/ the completely mundane, but fuel filter?

94Bronc

i think i've recommended fuel filter changes to like 20 people on the forums. its cheap easy and quick and actually helps with more problems than people seem to think until they actually change it

tdcarter72

I not saying its not the fuel filter, but I did change it about 3 weeks ago when I started down the EGR valve road.

I really think its going to be a fuel regulator or maybe a injector problem. I won't know anything else until I can test the fuel pressure.

Thanks for the replys guys! will let post the results of my fuel pressure test after I get it done.

Just call me Sean

iTrader: (1)

If the smog pump valve is malfunctioning it can cause backfiring too. So will exhaust leaks.

ymeski56

It's a 302 by the way. You may see excessive fuel pressure, or pressure quickly dropping after the engines shut off.

First would be the regulator (sometimes you'll see fuel when you remove the vac hose).
http://www.fordfuelinjection.com/?p=41

Second would be injectors failing to seat closed.
There used to be a great injector cleaned that was in an aerosol can. It screwed right onto the needle valve on the injector rail. I think NAPA carried it. You could always run a can of Seafoam in the gas. Or Lucas injector cleaner.