Hiccup/stumble not sure what to call it - Dodge Cummins Diesel Forum
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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post #1 of 7 (permalink) Old 01-09-2020, 12:38 PM Thread Starter
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Hiccup/stumble not sure what to call it

01 2500 249k miles. Edge programmer. No codes. When going down the road it'll stumble in gear and it doesn't seem to matter if you're 40 or 70 every once in awhile it just stumbles. It used to jump around at like 35 and 50 after I had my overdrive fixed. Anyone have any ideas?

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post #2 of 7 (permalink) Old 01-09-2020, 09:20 PM
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Post video of tach and sound. One issue is in and out of lock up. Another is a miss for worn injectors.

99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #3 of 7 (permalink) Old 01-09-2020, 09:51 PM Thread Starter
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Quote:
Originally Posted by bigfish95971 View Post
Post video of tach and sound. One issue is in and out of lock up. Another is a miss for worn injectors.
Tried to get a video earlier. I'll try again tomorrow but the tach does jump and makes a different sounds
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post #4 of 7 (permalink) Old 01-16-2020, 06:08 PM Thread Starter
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https://youtu.be/qoHB4ePxZHo here is the video
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post #5 of 7 (permalink) Old 01-16-2020, 07:25 PM
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OK. That looks like engine, not trani. either electrical or fuel, maybe both.

It is not going to be eay. If you can get somebody to check live data while doing it would be best.
one thing you can do is put a tap in the wirefron pin3 in the apps plug. It is the output wire to the ECM/VP. Tap the wire and hook up some 6 foot jumper wires, one to it and the other to ground on battery. then run the wires to the cab and hook up a voltmeter and set it up to read while driving. It should read abut .5v and steady at idle or with the key to on. Then it should smoothly graduate to about 3.8v at WOT.
When going down the road with foot on it or cruise on flat it should hold steady at whatever you are holding it at within a few hundredths of a volt. If it jumps or cuts out like the tach when it does that the APPS is bad. If it holds steady but hickups anyway the issues is likely in fuel delivery, ECM or more likely VP44.
Maybe edge issues too. Remove it and test. Same for any other mods.

Make sure all battery terminals and harness plugs are PERFECTLY CLEAN AND TIGHT.
The beginnings of internal mechanical issues in the timing in the VP will often not show codes until complete failure.
Always use scan tool rather than key for codes.
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99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #6 of 7 (permalink) Old 01-16-2020, 09:01 PM
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You are a walking, talking, human service manual bigfish95971, I enjoy reading your responses.

Mostly Stock 1999 Ram 2500 Quad Cab 4X4 Short bed, 24V, 5 speed manual, NV4500HD, NV241HD, model 60 and 80 Dana Diffs, Luke's Link, Raptor RP-100. BIG-D steering brace.
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post #7 of 7 (permalink) Old 01-17-2020, 02:19 AM
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Thank you. 20 years and almost 700k practice on my 99. and sold hundreds of them
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99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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