99 24v surge
 

I know one of you guys has the procedure for resetting the tps, the truck has a surge at highway speeds with a hot shot load behind it, throws no codes or lights, but is intermittent. commercial driver hauling hot shot come to me to fix and i knew it would be easier and faster to get the procedure from yall, than trying to find it myself, thanks in advance!

12V if its for your 96

http://www.cumminsdatabase.com/image...es/tps_ad1.jpg http://www.cumminsdatabase.com/image...es/tps_ad2.jpg
Caution: Before testing the TPS, verify that the engine is set at correct low idle speed.
1- After Confirming the correct linkage adjustment and idle speed , proceed to the following.
2- Attach a Paper Clip into the center terminal of the TPS electrical connector. Do not remove the connector from the TPS for this test.
3- Attach the positive lead of a voltmeter to this paper clip and the negative lead to a good ground.
4- turn the ignition switch to the on position , do not start engine.
5- The voltage at the TPS center terminal should be 1.0 Volt (within .2 Volts) with linkage at idle position at WOT , the output voltage must be 2.2 - 2.9 volts higher than an idle speed if voltage is not correct proceed to adjusting linkage.
6- the linkage rod (figure 62 ) connecting the throttle lever to the fuel injection pump lever is adjustable to prevent damage to the ends of the linkage, attach locking type pliers to the flat (figure 62) located on the linkage rod before loosening lock nuts.
7- loosen the right hand thread nut (figure 62).
8- Loosen the Left hand threaded nut (figure 62).
9- Slowly rotate the flat (figure 62) on the linkage rod (lengthen or shorten) to achieve 1.0 Volts (within .2 volts) on the voltmeter with the linkage in the idle position. At WOT , the output voltage must be 2.2 to 2.9 volts higher than @ idle speed.
DO NOT LENGTHEN OR SHORTEN THE LINKAGE ROD MORE THAN 1 MM FROM THE DIMENSION SHOWN IN (figure 61) IF THE VOLTAGE REQUIRED CANNOT BE MET BY LINKAGE ADJUSTMENT (125.6 to127.6 mm) replace the TPS.
10- Tighten both nuts after adjustment
11- With the engine off, operate the throttle from accelerator pedal and check for throttle lever action and binding. be sure throttle lever stop is against the low idle speed screw after throttle is released.
12- Be sure of WOT when accelerator pedal is pressed to the floor. This is checked by observing the throttle lever brake over position. Proceed to the following:

• A- Key Off and engine off for this test.
• B- 2 people are needed for this test . From inside the vehicle, press the accelerator pedal about 1/2 way to the floor. Movement of both the throttle lever and the throttle lever to injection pump lever linkage rod (figure 62) should be observed.
• C- Continue to press the accelerator pedal to the floor. If throttle lever brake over is operating correctly, the throttle lever to injection pump lever linkage rod should of stopped moving while the throttle lever continues to move towards the rear of the vehicle.

13- Again check and verify low idle speed Adjust when necessary.


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If its for a 99 then its the APPS


https://www.dieselbombers.com/24-val...tml#post199776

Hate to say it but it probaly isnt the apps!

Is this a bone stock truck?

yes the truck is a completely stock down to the original factory clutch 24v that is used to haul hot shot loads.

Sounds like the VP44 is going bad......

You need to get a fuel pressure gauge installed and see if the lift pump is dead.

That might be right on the money.

Is there a FP guage installed?

How are you checking codes? Scanner or key on/off trick?

here bout 2 years ago I replaced a VP-44 for a guy that had the same exact symptoms.......and it wouldnt throw a code either

how many miles on this truck right now?

there is not a fuel pressure guage installed, do not have a light and have not checked codes

188,000

First thing to do is swing by autozone and check the codes.

Then you need to get a fuel pressure guage on there asap. If you do not know how to do that, we can guide you through it. As well, if hes running hotshot with big trailers, he really should have a boost guage and pyrometer.

I agree with Doc.........I might also add that 188k on a VP is past the average life

get the codes and report back eh

well i just got laid off from a mechanic job, but am still good friends with the owner of the shop, family actually, so i have free access to a snap on modis and a matco scanner all i have to do is show up, the problem is the truck is not in my hands yet, so there kind of tied, i told him the same thing about the guages, and hes thinking about it, but i have never hooked up a fuel pressure guage on a 24v, so ill need some help guys. is there any chance that the computer monitors the fuel pressure, bc like i said, i have free access to a MODIS, which shows all the factory pids?

nuttin will show ya fuel psi

sorry to hear of the job woes :ouch:

its ight, got lots of side work, since i was the only diesel mechanic at the shop, so now everyone is coming to me on the side, and thats unrecorded income that uncle sam doesnt know about.

so help me out here guys, how do i go about hooking up a fuel pressure guage to this thing?

Does it have a port on the Fuel Filter Cap ? if not theres a fitting on the VP44 to connect to

Keith - theres 2 places on a 99 to hook up a fuel pressure guage. 1) On the VP-44 Test port (not recommended in my book), or 2) on the fuel filter housing (the port is 1/8" NPT). You can use 1/8" DOT approved air brake line for tubing.


Hookup on fuel filter housing #1 (use the front middle port as this is post filter):

Attachment 55560

Hookup on fuel filter housing #2:

Attachment 55561

Alternate hookup on VP-44 test port:

Attachment 55562


You MUST have a needle valve (or pressure snubber) to dampen the pulses from the VP-44. Before starting the truck close the needle valve all the way, start the truck and very slowly crack the needle vale and continue to open it until you get a smooth reading. It should be just barely cracked. Thats all there is to it.

where is the easiest and cheapest place to get everything i need for this setup?

One of our sponsors should be able to hook you up but many of them will want to sell you an isolator setup with really adds to the cost.

The toughest thing to get is the needle valve and the fittings. Often, you can find this stuff at a local hardware or automotive store.