Back Firing HELP!!!

[GrandWaggoner757]

i have 1990 grand waggoner and 2 days ago the spark plug wares got melted on my headers so i replaced the wires and spark plugs and my firing order is rite and it back fires now?

[ironman_gq]

by backfire do you mean it pops out of the carb or that it pops out of the tailpipe which isnt a backfire but unburned fuel igniting in the pipe and making a loud bang. if its in the pipe check your choke and then make sure your plugs and wires have good connections and are in the right order.

[GrandWaggoner757]

it pops out the tail pipes and out the carb and i got the firing rite and good connection i have some people saying its ethere my carb or i bent a valve

[dwg86]

Put #1 cylinder on TDC. Make sure the rotor is pointing at #1 then check firing order from there...1-8-6-4-5-3-7-2...I think?

[tufcj]

1-8-4-3-6-5-7-2

It's really easy to get 5-7 switched. Count is clockwise around the cap.

How many miles? Could have a bad timing chain and jumped a tooth. Could also be the dreaded distributor drive gear wear.

Bob
tufcj

[ironman_gq]

crossfiring? maybe a tracked up cap or crud under the cap causing it to fire to two cylinders at once. I had one with a bad timing set backfire under heavy load and one with the timing way off do the same thing.

[dwg86]

1-8-4-3-6-5-7-2

It's really easy to get 5-7 switched. Count is clockwise around the cap.

How many miles? Could have a bad timing chain and jumped a tooth. Could also be the dreaded distributor drive gear wear.

Bob
tufcj

Thats the right firing order! Sorry , I had a brain fart.

[mkzmomo]

1-8-4-3-6-5-7-2

It's really easy to get 5-7 switched. Count is clockwise around the cap.

How many miles? Could have a bad timing chain and jumped a tooth. Could also be the dreaded distributor drive gear wear.

Bob
tufcj


that's what happened to me once #-o

[mrtazwrench]

1-8-4-3-6-5-7-2

It's really easy to get 5-7 switched. Count is clockwise around the cap.

How many miles? Could have a bad timing chain and jumped a tooth. Could also be the dreaded distributor drive gear wear.

Bob
tufcj


that's what happened to me once #-o

I can rattle that off the top of my head anytime, most V8's use that with the eception of ford since they number their cylenders different.