Hi everyone, Im newby on this forum and I have a questions for you, I really need help.
I have a 1999 dodge 2500 5.9L diesel, that I just bought, and Im experience and issue with it, when driving in 3rd or O/D if I stay between 1650 and 1750 rpms the truck start doing something weird, is like loosing power drops 150rpm for a second and then goes back to the original rpm and ones that its back is doing again droping rpms (is cycling, like trying to down shift and up shift)
I dont know what can I do, please help me

If you need better explanation please let me know.

 

Do a search on lock up hunting.

Bet it is what you are experiencing.

 

Good possibility. These are some of things have encountered:
I have topped tranny fluid at a half pint over full. Won't hurt and may cover a VB leak.
Make sure brake switch is not out of adjustment.
Check speed sensor at rear of tranny case for connections.
Check all major high current electrical connections, batteries, alternator, fuses, ect.
Use aluminum foil and wrap(shield) the alternator wiring to battery and cover electrical components. It doesn't have to be pretty and can take off or do better if helps.
Install a old ignition condenser from Alt output terminal to housing. This helps shield from brushes arcing and weak internal condenser. Or you can buy a 75 dollar shielding kit from tranny suppliers.

 

sorry, but can you explain me what a lock up hunting is? Im new on this, and what the alternator wires and baterry have to do with the tranny sorry for this questions, I just want to learn.

Thanks for all your help

 

electrical/magnetic interferences, alternator wires with the APPS, accelerator pedal position sensor (tps on a gasser) you can try wrapping in aluminium tape.
check all the ground on your truck
have you checked for trouble codes?

 

I dont have any check engine light on ot any light on, but i can look for a code any way.

I will do all that today and I call let you know tomorrow guys, thanks for all your help

 

I also had good luck using a Ferrite choke (use 2, one on each end) of the black cable with brown tracer. I also have it wrapped with aluminum foil and the chokes and no issues whatsoever. I also reset the apps and all is now well.

 

ive got the same problem. just started happenning and i happen to have an appointment with the local diesel shop next monday for a major service.
ill mail you what they say in a week.

 

yes, you can try reset the APPS heres the procedure: http://www.cumminsforum.com/forum/98...pps-reset.html

rob

 

dieselmx, if the alternative remedies do not fix it, and you are sure you need to replace the APPS, look for the Timbo APPS thread, much cheaper and works like a champ.

In the end, on my 97, I had to replace the TPS.

 

I found the issue to be a loose batt ground....an easy check to solve my similiar issue.

 

I friend of mine, told to open the hood, check all ground that you find in the Engine comparment (I found 5)
use sand paper , clean them, put them back and re drive the truck, I did it and no more issues since then, defenitly was a electrical/magnetic interferences like all you guys told me, thanks for all your help!!

Now, time to buy gauges, performance box or chip to get a little more power for towing.

Thanks again.