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Hello all,
I, too am suffering from the 440 backfire problem. Mine seems to be hit-or-miss as to it coming from the carb or the exhaust. I have tried all the standard stuff for resolving the issue (plugs, wires, cap, rotor, check fuel pressure, timing, heet in new tank of fuel, and even swapped the carb for a known good unit...) On the note of swapping the carb, when I pulled it from the intake manifold, I noticed a "hole" (more like a burned through spot) about 1/4" - 3/8" in diameter on the intake plenum floor on the drivers side? Is this normal for a Dodge? I am a Chevy guy and rebuilt a ton of small and big blocks, and haven't ever seen anything like it. Is this part of the egr ports, or have I found a huge contributor to my backfire problem? Any assistance you can give a confused Dodge owner would be greatly appreciated.
Thank you,
Chris
PS: sorry for the duplicate post on an older message...wasn't sure if anyone would see it.
I recently bought a 1976 Dodge Titan with a 440. I have the same problem. The starter was bad so we replaced that. Changed all points, plugs,ect. The carb was not getting any gas and would backfire then it will all the sudden flood. My husband put an electric fuel pump (temporary) just to see what would happen and gas flooded the carb. We got it started for about an hour and then we turned it off and it wont crank because of the flooding. We did the heet and new gas. We may have a simular problem. Let me know if you figure it out.
Good Luck!
If you have a carter thermoquad carb you may poss have a sticking choke. it is not an electric on most of the 440 dodge's, there is a rod that sticks out of the pass side intake manifold which attatches to the carb. this is attatched inside the manifold to a bi-metal spring that uses egr (exhaust gas recirculation) heat to warm the spring thus pushing the rod up. inspect this, its prob stuck causing your engine to run rich.
I by-passed mine with a universal manual choke kit.
If you have by-passed the heat riser valve on the pass side exhaust manifold you will also have this problem.
another thing to check is the exhaust heat riser valve located between the pass side ehaust manifold and the exhaust pipe. they are prone to sticking open and sometimes closed. youshould be able to turn the linkage by hand.
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