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.


---------------------


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.