caldwells99mustang

i have a 302 in my mustang and for some reason i cant get it to stop backfiring. i have a brand new distributor on it, new wires, plugs, coil. just replaced the timing chain. all the timing is where its suppose to be. anybody have any ideas what it could be??

9050LX

Check the timing with and without the spout.check compression.Check plug wires,Check computer ground.Check for vacuum leaks.Simplest things first.

$hawn

wrong firing order or wired clockwise???

Hurstmeister

^ This.

I made this same mistake recently.

Hurst

95coBraSVT

Also guilty of that.

caldwells99mustang

its the right firing order i even pulled all the wires off then redid them again. but what do you mean wired clockwise

95coBraSVT

Basically, you wire the dizzy correctly, but completely backwards.

Superwes98

well mine back fires like freakin crazy when im slowin down from high rshared_pm
but thats because of my mufflers, or the lack there of lol

caldwells99mustang

oh nope rewired everything again today and still doing the same shit. and i forgot to mention its backfiring though the carb not the exhaust

95coBraSVT

A backfirwe through the carb is an indication of a vehicle which is firing before the valve is closing. Is is a consistent backfire? Or intermittent? If it is consistent, then I would say you have a valve stuck open. If it's intermittent, then I would say you have a sticky valve or a plug wire wrong or something. You sure you have the right firing order? There are TWO different ones for the 302 you know. And the firing order is determined by the camshaft.




EDIT* You may also have accidentally installed the timing chain a tooth off.