I am just looking for some reinforcement opinions that my problem could be my apps and not my vp44. I want to hear some of the strange symptoms that the apps can cause that are not vp44 related.
any input would be helpful in saving big $$$ thanks

crazycooter's Sig:

2001 3500 cummins (obviously) 125K on the clock, hell of a steal, but where do you find one of those without a few bugs? Mostly stock for now, but plan to change a few things... new vp44, +50 hp injectors, Amsoil air filter, Amsoil 5w30 series 3000 engine oil.

throttle response drops off to zero then comes back on suddenly

Whit's Sig:

* 01 Cummins/Dodge/HO/6 speed*275 injectors*PDR 35 turbo w/14cm housing & high pressure boots*HTT 3 piece ported exhaust manifold*Progaurd 7 with prefilter*Edge Comp*Fass II*Southbend con OFE*Jacobs brake*5"Stacks Big ens*E/F shift knob w/2low & brake switch*10 Gages*KW Ram air System cab controlled*Rickson 19.5x265's*True speed calibrator*Rancho 9000's*DT track bar*DSS steering stabilizer*KW Side impact rails*KW Traction Bars*Toolbox/fueltank 60 gal Combo*Mag High Tech Diff Cover*Ranchand bumpers*Grover air horns*Rear Wheel Cylinder Upgrade DYNO 375 Horse 941 Torque

“Life is not about waiting on the storms to pass…it’s about learning how to dance in the rain.”

shift points change a bit at times
torque converter might stay locked when it should release
can go in and out of TC lock up for no reason
truck "feels" sluggish
mileage drops
and what whit wrote above, that's classic APPS failure.

Check the voltage on the APPS if you haven't already. You can adjust it if it's off. It's pretty easy.
Also, check for codes if you're having issues.

DeLuzGN's Sig:

1999 Dodge Cummins, Q/C, 4x4, auto w/ some upgrades (previous owner did something to the trans....), FASS hpfp w/ 1/2" lines, Isspro EV fuel, pyro, boost, trans temp, Smarty, power puck, AEM Brute Force intake with Amsoil nano-fiber filter, silencer ring MIA, straight pipe, corroded black paint, homebrew biodiesel.

APPS will always throw a code... (P0121, P0122, or P0123)

VP44 might throw a code it might not...

Mopar1973Man's Sig:

2002 Dodge Cummins - Michael Nelson

don't know if it threw a code or not, and have not road tested her yet, but I am not going to throw my old one away just yet. I went ahead and found one today out at Pueblo Diesel Injection out the door for about $450. I hope I didn't waste my money. I have about 1500 miles that I have to go over the next ten days, so I will find out if that was money well spent. It did seem to make it start easier and not tons of gray smoke on cold startup. I think I am moving in the right direction now, but I am still not convinced that the vp is also a problem. I will add to this when I get back around Thanksgiving.

I will say for sure though that my Cr@ppy running Cummins runs a lot better than my good running powerjoke

hotcummins's Sig:

its a 12valve with a few performance adders

Bit of a bummer as you can get an aftermarket APPS for under $200.

mishkaya's Sig:

'01 Dodge 6spd, Mach 7's, Helix 2 cam & springs, twins, Adrenaline, DD clutch, DOR bumper, etc...

No kidding... I know a guy selling them for $160...

Let us know how that worked mines kinda actin funny too hopin its the apps and not the vp. Im thinkin apps cause it doesnt act up with cruise on.

blkjack's Sig:

2002 Quad cab 2500 24v 6spd. Mods, Quad Adrenaline, Gauges, FP, Pyro, Boost. Air Dog 150, 86d' Silencer ring, Turbo back 4" straight piped exhaust w/ 5" tip. BHAF with custom heat shield. Custom built bolt in gooseneck hitch.

SWCR CUMMINS MEMBER #10

(Thanks Rick)

whish i had known about that $160 one before. this one was after market. Dodge wanted almost $600.

Im off here in a bit and will have more to add by thanksgiving

$450 OUCH


Hope it fixs your problem though.

lukesdiesel's Sig:

Diesel Dawgs Performance

Unleash the Dawg!!

828-631-1546

www.DieselDawgs.com

Expandit Exhaust Specials

6.7 Cummins XRT Race Tuner

Cummins 24V Race Injectors

yeah, that's a bit more than I spent for mine...gotta love Timbo's APPS! also, if you're worried about it, check your codes by using the key trick...turn the key to the on position, then off, three times. The third time, leave it in the on position, and watch your odometer. IIRC, it should flash PCM, then whatever P codes you have, then wait, and it'll flash ECU (or ECM, can't remember off the top of my head) and whatever codes you have. I think APPS is P0122 or P0121, something along those lines. If you see P0216 though, you've got a dying VP44.

dennhop's Sig:

2001 QC SB, 5spd, stacks, AD150, Scheid 150s, Comp, and coming soon a 64/71/14...
2003 CC SB, STOCK

Also I didn't see it mentioned. If your having dead pedal problems try using your cruise control. The Cruise bypasses the APPS and if that is causing your problem you will be able to maintain speed. Pedal still won't work but you can adjust speed using the cruise. If its the VP then the truck should still go into limp mode.

As least it worked on my manual truck. Don't know about an auto. And I feel your pain. The Last time my APPS quit was about 6 months before they came up with that cheap aftermarket solution. I paid $450 also.


For those interested in a DIY That part that seems to fail the most on the APPS is the Idle Validation circuit. The APPS handles this function electronically. It is a rather easy procedure to mount a mechanical microswitch that handles this same function. If I'm not mistaken that is all the Timbo APPS does. Most times the potentiometer section is still good.

kazairl's Sig:

02 6 speed High output 4.10 gears AFE stage 2 Intake AFE 4" straightpipe Edge Jammers 100HP Injectors Quadzilla Adrenaline BD short shift 285/75 R16 Wild Country A/T on Eagle Alloys Some aftermarket speakers and a couple subs

Good post there kazairl I orderd one of those Timbo apps today and that is good to know about the micoro switch. Thinkin now im going to investigate that further and see if i cant do a post on how to set one up once i get my new one on and going for those having probs. And like you said w/ the cruise mine does fine w/ cruise on dosent act up then.

run two stroke about 3/4 of a qt in your diesel at every fill up a whole qt if your just about empty add the two stroke then fill up it keeps everything lubed and happy. plus more mpgs and power and truck runs a little quiter

lunk's Sig:

04 dodge dually 6" assie stacks, gauges, b&w gooseneck hitch, leveling kit, air bags, chip, boost fueler, cold air intake, and 9' 6" western V plow
01 dodge 2500 3" lift, 35" bfg's, smoked headlights and tail lights, recon smoked clearance lights, 03-07 style adjustable track bar with adapter plate, goose neck, and a 8' western plow