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  #1  
Old 04-25-2012, 02:05 PM
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Default Multiple missfire help

I have a 97 1500 4x4 with the 360. I am having constant missfire on several cylinders. I scanned it and it is cylinders 2 4 7 and 8. I have cleared the codes and as soon as the truck runs for what seems like seconds the codes pop back up. I ordered the Hughes plenum fix cause the truck has 220k on it so I am gonna do this anyway.

I plan to check compression and ignition components first. My question is, before I start tearing into this thing are there any common fail points or sensors in the Ram that could also cause this? Since this is my first Dodge, (been a chevy guy till recently) I am not familiar with this motor. Any advise is appreciated.
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Old 04-25-2012, 07:54 PM
Kruzer Kruzer is offline
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From your symptom if I were a betting man I would say you are on the right track with the intake manifold gasket replacement. The only other problem and your miles could also lead to this, is the distributor and/or bushing in the block could be exessively worn. This causes real irratic misfire conditions as the distributor moves instead of staying rock solid.

I don't know of any sensors on the magnum engines that would cause this problem.
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Old 04-25-2012, 08:35 PM
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When is the last time the cap and rotor were changed? There could be a crack in the cap or the rotor could be in bad shape and cross-firing in the cap. Like Kruzer said though if the plenum doesn't fix it I'd do the cap and rotor with the change just to be sure,
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Old 04-26-2012, 02:52 AM
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I'm not sure when any ignition components were changed last. I got this truck for nearly nothing because of this problem. I have had it for about a year now and just now getting around to starting on it. I am gonna do a full tune up ie plugs, wires, cap, rotor, and clean throttle body. Then change the gaskets.

Kruzer, where is the distributor bushing? Can it be changed without a tear down? If so I might just order one and change it while it's apart.
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Old 04-26-2012, 09:23 AM
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I believe Kruzer is referring to the center bushing(s) inside of the distributor. It's just like any other bearing intended to keep the rotor and center shaft in the dist running true. If it had wear in it you'll notice it when you pull the cap off as there will be side to side play in the rotor.
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Old 04-26-2012, 09:30 AM
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Thanks for the clarification Warlock. I will definitely check that also.
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Old 04-26-2012, 06:05 PM
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Default More things to check.

As Warlock III said there are bushings in the distributor housing itself, but the one I am referring to is mounted in the block. There is a Mopar tool to Knurl the bushing to take up the slack created from wear. There is also an intstall/removal tool for that bushing as well. The distributor can be checked once it is removed the bushing in the block is not so easy to check. I've only seen two that needed replaced the rest could be knurled with the tool. This bushing is much like a pilot shaft bushing for a standard transmission, it mearly keeps everything in alignment and restricts movement. If it has enough wear it will let the shaft move around causing wear to your distributor and finally your rotor will rock around and cause irratic misfires and if severe enough could crack your cap. When you remove your cap inspect it throughly to see if the rotor has been contacting the cap, this could indicate a problem with the distributor or the in block bushing. Also when you remove the cap, grab on the distributor shaft try to move it in all directions and see if there is excessive play. Try to turn it back and forth by hand as well, if you have a lot of play then your distributor gear is probably worn as well, this gear doesnt come out with the distributor body when you remove it. All of these things directly affect your timing. Just more food for thought and things you can check once you start your major tune up.
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Old 04-30-2012, 01:43 PM
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Just a suggestion.. While you have the intake out to get after that gasket. Clean it up real well with some seafoam spray lube or something comprable.. You willl definitiely notice a difference when you get the other problems worked out.
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Old 05-09-2012, 07:20 PM
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plugs, wires, distributer cap/rotor, intake...etc...?
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Old 05-14-2012, 12:16 AM
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Well I may have found the smoking gun. I took the intake off this weekend and there was a lot of oil in it and I could clearly see 2 spots where the plenum gasket was blown out. I also found 3 injectors that look nasty. So I plan to buy reman ones with 4 holes as an upgrade. I am still gonna change all ignition components out while it's down as a precaution. Thanks again for all the help.
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