Dodge 440

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Dodge 440

Home > Discussion Forum > Mechanic's Corner (general)

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All Messages in Thread	Author	Date
Dodge 440	Jill	6-23-06
We are new to the RVing world and have just purchased a 1980 Dodge Jamboree Sportsman. The first time we took it out it ran great. The second time a very different story. We filled up the gas tank and at 50 mph it started backfiring and wanting to stall out. We have replaced the coil, plugs, wires, carb, distributor and the egnition module and it is still wanting to backfire at 50 mph. It will run ok up to 50 but for some reason when we hit 50 it acts up. I am at my wits end and my husband is ready to throw in the towel. It has a dodge 440 engine. The coil is reading 5.6 volts on the positive side and when the negative side is disconnected it reads 12 volts. He did the vacuum test and everything read ok. Does anyone have any suggestions? We are also looking for a service manual and a place to get parts. We live in the central Florida area if anyone knows of anywhere to get this info. Also looking for a reliable mechanic! Any help would be appreciated!
Re: dodge 440	matt	6-5-07
I have a 77 red oak motorhome with a dodge 440 in it. Took it on a 300 mile trip ran ok but when i would stop at a light are toll both and took off again it would spit and sputter got home changed vaule cover gaskets and plug wires and made sure firing order was right and now it back fire and can't get above 50 are so but when in park are netural seems to be fine any help would be graet.
Re: dodge 440	John Newman	6-30-06
Hi, I had a similar problem with a 79 Pace Arrow that I owned; however, mine would run good for a while and then start the backfireing (actually blew the muffler apart). After much troubleshooting, I found the problem to be in the plug at the back of the engine where the ignition module was located on the 79 440. One day I accidentally bumped the plug with the engine running and it backfired. Removed the plug, cleaned the connectors, reinstalled plug...end of problem. Hope this helps? John
Re: dodge 440	Sam Watson	7-2-06
5.6 volts on the coil + is way out of specs. With the engine running, you should see around 10.5 volts at the + terminal. Follow the red wire at the + terminal back, probing with the volt/ohm meter all along. You will come to the ballast resister, it should be a dual unit, red wires on one side, and a green on the other, the green one feeds the ignition module, check the "in" end of both sides of the ballast resister for voltage, should be within a volt or so of the battery. During cranking, the coil side of the resister is bypassed so the coil gets available battery voltage, if your battery is good, it should read around 10.5 volts while cranking. I'm assuming that you've got the 727 automatic transmission in the rig, which means the starter won't activate when you are in "DRIVE", so do this, take the rig out warm it up, take it up to 50, if it starts to backfire, turn the key to"Start", and hold it there. The starter won't engage( park/neutral switch won't allow it to activate), but the coil resister section of the ballast resister will be bypassed, and the coil will get full battery voltage, producing maximum spark. If this test stops the backfire, then I have a fix for you, (rather than holding the key in "start". Come back here with the results.
Re: dodge 440	tim mcdonald	7-25-06
My 79 dodge RV with a 440 motor had same problems, I replaced ballast resister, ignition module, installed rebuilt distributor, check wire and cleaned ends, thought is was ok, but problem just came back again and again, went to local performance shop and had a person that had 440 muscle cars said bypass ballast resister and install a msd coil, well problem went away and never came back and motorhome runs stronger and better, ballast reister reduces power to coil so stock coil last longer and does not burn out however heat build up in motorhomes causes problems with this, so you have to put in a msd coil and bypass ballast, msd coils do not need ballast....Now if I can just fix the 440 from running hot on the hills....
Re: dodge 440	Jill Hill	7-7-06
Will give that a try and get back to you.
Re: dodge 440	PAT	3-11-07
I GOT FUEL I GOTFIRE BUT WON'tstart can any one help it is a79 champion thanks

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