bucking

[Turbo Thom]

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OK folks:
When towing this weeking in North Georgia every time I got to a point where I had to give about half throttle to climb, the truck started to buck and it would get so bad I had to clutch the engine or I would broken something. It would do this in third and fourth. If I dropped into 2nd and ran about 2400 RPM it would pull without any problem.
Now when I run empty I have a slight "quiver" to the engine I cannot seem to find. The pump has been set-up by a Bosch mech. and he says it is fine. The only up-grade to the motor is 300 injectors. Could this cause the trouble? I have been told the govorner need a rebuild. Is this the trouble? I didn't have this problem till I broke the throttle rod. I replaced it and this started. . The only adjustment I see is the 5 inches from the ball joint and the frame bracket. Is there another adj. I don't see? The hopping feels like the petal is being pushed in and let go very quickly.
I can't tow like this but I don't know what to do.
Does anyone have any idea what is up with this pump?
Thanks;
Preston
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96 3500, Black SLT, 5 speed, turbo diesel, , with US Gear overdrive, Rhino liner, Reese 15,000 lb. fifth wheel hitch, US Gear de-celarator exhaust brake, muffler elimination kit, Amsoil lub. , Mag-hytec rear cover, dual-remote by-pass filters, and Roadmaster Active system, AutoMeter Pyro & boost, Primeloc

 

[Missouri Mule]

turbo thom,
I have read about bucking problem in the TDR and on this site. AS I recall it has something to do with throttle linkage, the return spring comes to mind.
Only other thing I think could cause it would be trans.
My Freightliner will buck at low speed/low gear especially on tight turn. It has electronic accelerator pedal.

I will check the TDR publications for bucking problem.

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Bill Thomas
Missouri Mule - 96 Wht 4X4 ST CC,5 spd, 3. 54, 8 ft bed, 1 ft high cheater boards.
99 Freightliner bl/wht FL60 ISB-5. 9 24v,215 hp,520 tq,6 spd, 3. 59 nsr,16 ft box, 19. 5 tires,Wt/gvw 11,000/23000

 

[Missouri Mule]

turbo thom,
Found three references to bucking.
All spring related.
Issue 18 page 22.
Issue 19 page 16.
Issue 20 page 26.
The latter two refer to TSB 18-29-97A.
The outline for this TSB is in issue 22 page 53 under vehicle performance catergory 18.
If you don't have issue 22 I will e-mail you the outline. The TSB specifies 96 thru 98 with Cummins and 5 spd trans.

 

[DieselB59]

Right after I put the 300 nozzles in, (now 370s), my truck exhibited a buck that would get progressively worse if I kept cruising at a set speed. I replaced the spring with the updated kit (complain to a 5 star dealer enough and the 200. 00 kit will be given to you as a voluntary recall at no charge) and the problem went away.

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Chris Timochko
*Association of Diesel Specialists Certified*
AUTO WURKS DIESEL R&D TEAM
1997 5sp 4X4, Rhino Linings, Espar Heater, A. W. D. HX40 turbo, ATS 3pc Manifold, BD 4" Brake, Marine Compression, A. W. D. Custom Tuned Injection Pump, A. W. D. Intercooler, A. W. D. /Mallory Fuel System and Braided Stainless Lines, A. W. D. 370B Injection Nozzles, Delivery Valves, Governor & AFC Spring Kit, Psychotty Air, NOS Diesel Kit, A. W. D. 6" Chrome Exhaust System, BD No Smoke Valet Switch, McLeod Dual Disc Clutch, Mag-Hytec Rear Cover, Cummins Chrome Kit, Optima Red Tops, Hadley Bully Horns, Hurst Line Loc, Goodyear Wrangler AT/S 305/70/16s. 15. 50@97mph on Goodyear All-Terrain tires. Dynoed at Ida's: 435 hp at the rear wheels.
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Project U96 - 1996 3500 2WD racer. A. W. D. Marine Ultra Low Compression, A. W. D. Teflon-coated Pistons, A. W. D. High Lift Camshaft, Ported and Honed Cylinder Head, Intake and Exhaust manifold; A. W. D. HX40 Turbocharger, ATS 3pc Exhaust Manifold, A. W. D. Water Mist Injection, A. W. D. Custom Fabricated Fuel System, Race Spec A. W. D. /BD P7100 Injection Pump, A. W. D. Custom High Flow Fuel Injection Nozzles, BD Auto transmission and Custom TC, Weld Draglites, Goodyear Eagle Drag Slicks, 5" Single Stack Through The Bed, Mag-Hytec on Rear and Transmission. 11. 54@115mph