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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 98.5-02 24V Forums > 98.5-02 Powertrain
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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Old 06-07-2007, 01:15 PM   #25 (permalink)
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[QUOTE=JSPulliam21;241272]I have never felt a clutch slip on a heavy duty engine.....QUOTE]

I have.
I don't think that's what it is.
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Old 06-15-2007, 06:35 PM   #26 (permalink)
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Update: I have done some "testing" and it will miss as usual at or above 3200 rpm. It will not do this before 3200 rpm. At 3200 it will miss once, and if I continue to accelerate it will miss more often. Like a bam....bam..bam.bam.bam. Could this be a rev limiter? It does not matter what gear I am it. If 3200 comes up it will miss. Also, I went back to a stock boost elbow to try and lower the boost, but I can still hit 30 psi easy. Any more thoughts?
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Old 07-05-2007, 10:40 PM   #27 (permalink)
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Here is a video of my truck a couple of weeks ago at a truck pull. You can hear the bucking/missing/flubbering several times. It started doing it around 2800 - 3000 rpms, and I had to keep it just below 2800. Maybe this will help you see my problem.
Video - Short video of my truck bucking, flubbering, missing, or whatever you want to call it. Pulled 50K lb sled 230 feet in 2nd low range.
(the vid may not be up right now, but it should be soon)
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Old 07-06-2007, 10:28 AM   #28 (permalink)
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Now when you Lug these engines with Big injectors, they will surge/buck.....My Mach II's do it all the time if i try to run 4th gear at 35 MPH and load the engine up.....(the only think i hate about my 5 speed...no good gear between 3rd and 4th!)

BUT you seems to have it at higher RPM's as your Vid showes......Get any white smoke when it does it?
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Old 07-06-2007, 03:42 PM   #29 (permalink)
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I tried to run the rpms up past 3000, but at 2800 it started bucking and I had to keep it just under 2800 to stop the bucking. No white smoke ever.
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Old 07-07-2007, 01:18 PM   #30 (permalink)
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I got in touch with a diesel shop in son TN, and I am going to run down there after work on Monday. He deals mainly with Dodge diesels, and after I described the problem he immediately suggested a crank position sensor. Monday he said he will put a serious scanner on it to check all the codes in both computers. I will let you guys know what happens. The defueling theory does not make sense to me, because I have felt other trucks defuel. They just seem to fall on their face after a certain point, not buck and jerk violently, and certainly not at different rpms. Keep the help and suggestions coming!
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Old 07-09-2007, 08:40 PM   #31 (permalink)
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Two serious diesel mechanics that I have been dealing with say that the pump is slipping timing. Today we hooked up a code scanner and drove the truck to check sensors while the "event" was happening, and everything checked out. We put an APPS on it, and that did not solve it. The only thing that is left is the pump. I guess I will just keep running it until it throws a code or dies. Thanks for all of the help guys!
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Old 07-10-2007, 09:42 AM   #32 (permalink)
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Quote:
Originally Posted by JSPulliam21 View Post
Two serious diesel mechanics that I have been dealing with say that the pump is slipping timing. Today we hooked up a code scanner and drove the truck to check sensors while the "event" was happening, and everything checked out. We put an APPS on it, and that did not solve it. The only thing that is left is the pump. I guess I will just keep running it until it throws a code or dies. Thanks for all of the help guys!
I can see this on a 12V truck....but not very likely on a ISB unless the key in the pump shaft is missing or broken. It’s a keyed interference shaft that presses into the gear......
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Old 07-10-2007, 05:51 PM   #33 (permalink)
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I understand how the pump and gear are connected. What could they mean by "slipping timing?" Could it be an electronic thing in the pump module? That is what I figured.
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Old 07-25-2007, 06:48 PM   #34 (permalink)
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The other day I took the electrical connector off of the VP to check the wiring and pins. The pins and connector looked clean and straight, and the wiring looked unmolested and solid. So, I put some dielectric grease in the pin sockets, like I do with any electrical connector, and plugged it back up. Today, I decided to see if it would buck and carry on. I could not induce the bucking and flubbering at all, and I reamed it hard past redline in every gear or about 10 miles. It revved clean and smooth all the way to 3500 rpm's where it defueled smoothly, like it should, and stayed there. I wonder, if one of the pin sockets in the plug is loose, and a certain rpm's the pin or connector vibrates and breaks the connection intermittently. If so, then the dielectric grease took up the slack. Any thoughts on this diagnosis? Good and bad are welcome, as always! I will continue testing, and update you guys as I learn new things.
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Old 12-30-2008, 02:09 AM   #35 (permalink)
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Did the dielectric grease fix the bucking for good? I've spent the last week and half trying to search this problem of mine down. I have similar mods so I hope it works for me too!
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Old 12-30-2008, 12:10 PM   #36 (permalink)
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The only thing that worked permanently was replacing the VP. It finally died on me for good in a gas station parking lot. I would start considering replacing the pump.
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