touchy throttle with Piers gov spring kit

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After installing the governor kit from piers the tip in of the throttle from just off idle is to much,today while pulling the goose neck trailer on rough ground it gets to bucking I can not hold it steady enough as it only has to move 1/4 "or less to make loads of differance. If you are in neutral and try to ease the rpm up to say 1100 it's almost impossible ,just goes right on past to 1500 . I took the small springs back out per Piers suggestion and it helped but not enough . Have any of you with the kit had this problem and what did you do?The truck runs good on the top end but I can't drive that fast all the time.

 

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Ramman, I assume you have the 215hp 5sp? Did the truck pull the gooseneck without bucking before installing the kit? My truck would do the same thing as you described (pulling my goose neck only) when stock. I installed the TSB for the throttle linkage to correct this problem before installing the spring kit. I also had to remove the center spring as you did to obtain a governed speed of 3600-rpm. One thing I did notice as I increased the spring tension on the spring packs, the less resistance I would have on throttle input. You may try to lighten up the spring packs a bit to add more tension to the throttle or look at the TSB as I did.

One item you may want to look at is if you have tension on the afc spring. When playing around with the afc and no airscrew settings I have inadvertently lightened up the stock afc spring to the point that it was very loose (no tension). This added to some erratic low-end throttle response. I doubt this would cause what you are describing but worth the mentioning.

Have you checked your throttle return springs below the fuel shut off solenoid? I had some luck installing stiffer springs I found at the hardware store. The dealer wanted 50$ for the stiffer set, no thanks 1. 99 worked just fine.

These are all simple items but the best I could come up with from my experiences. #ad

 

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First use the back end of your vernier calipers to make sure the distance from the stud to the retainer is equal on both spring packs. Second, back off one click on both sides. You won't get rid of all touchiness but this should help a lot. With stiffer inner springs, when they come into play (rpm vs. rack position), the response will be a little jumpier. However, you should be able to reach a point where it is quite driveable, especially with some practice.

 

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I found the solution to this same problem in the AFC allen end screw. I backed it out about 4 turns and it made a world of diff. Mine throttles real well except at transition from no throttle to very little. It is still a little jerky hear. I may try Joe's suggestion about the spring preload.

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1972 Chinook class C with 96/215 5spd, 4/5" exh, 4"BD, MagHytec, 85gal fuel, K&N RE0880, AutoMeter, 370's, BD gov kit, BD afc kit, 16cm, yada-yada-yada
www.fostertruck.com/cummins

 

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It takes a whole lot of getting used to, and you also can get beefier throttle return springs to help put the bucking to bed.

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Chris Timochko
1997 5sp 4X4, HX40, BD 4" Brake, Marine Compression, Custom Tuned Injection Pump, 370B Injection Nozzles, Delivery Valves, Governor & AFC Spring Kit, Psychotty Air, Water Injection, NOS Diesel Kit, 6" Chrome Exhaust System, 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. Test mule for Auto Wurks Diesel race program

 

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I had the same thing happen to me. The throttle was a little too sensitive at first. Backing off the spring packs until they are snug but not compressing the springs worked well for me. The pump technician at BD suggested that I do that.
Steve

 

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Wow Tim you got a bunch of good answers before I even read this thread #ad
If you can't roll on the throttle a little in neutral without it reving to 1500 I would back of the tension a click. I have made some new seats up that will allow more throttle travel before fueling starts, if you want I'll send you a couple to try out.

 

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Thanks guys for all the replys,I love this site,to answer the bucking question no my truck had never had this but I have driven ones that did so I am aware of the old problem. Second I adjusted the nut to stud to . 053 after removeing the baby springs and had intended to back the nut off one click but haven't had time yet maybe monday. Piers if you read this the new seats might be the answer I'm looking for if you can send them that would be great. I'm afraid that if I don't do something and have a big load on I will surely brake a driveline componet as the jerking gets rough quick unless you lift to idle or get the rpm's above 1500. Thanks again for the replys sorry I didn't reply sooner but Thanksgiving get togethers took me away from the computer.

 

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I don't think the cause is the gov spring kit. It's the linkage. The gov spring kit is just enhancing an existing problem. Here's why I say that.

I also had the bucking problem, only while towing & only accelerating up hill. Others on this site have had the problem without a grade! After Dodge put in the linkage kit, with stronger springs, the problem disappeared. #ad
The downside was that the pedal effort rasied a bunch. #ad
Now that I've got the gov spring kit, the pedal effort went back to stock feel & maybe less than stock. I really like the feel. #ad


I don't know how the Scourge gov springs work, but it appears that the total pedal effort is in fact 2 sets of springs, in series. The linkage springs & the Scourge springs.

I would bet you that the 'easier' pedal effort caused by the gov spring kit, combined with the already too weak linkage springs caused the problem. If you go & massage the linkage by hand, you'll feel the problem right away. It's way too 'easy'. Experiment & change the linkage springs yourself before getting the kit put on.

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Money Sink - 96, 5 speed, HX40-16, TST #11/280 slid 3/4 way, 300 HP Injectors, Scourge BD Governor kit.
4" CATless turn down straight out back.
ISSPRO Pillar, Delvac 1 & Amsiol, RE-0880, Mag-Hytec, 3:54, 235s on Alcoas, Rancho 9000's, Valentine One.

 

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I would like to publicly thank Piers at BD for his contuined support and expert advice during my experience with their product,never before have I been treated better than this. I would have to recommend BD and Piers to any one looking to purchase diesel products,I have three different products and am 110% satisfied. Thanks again Piers. Tim

 

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Well I have the same problem, the problem did not start untill way after the gov spring kit. I'm not sure the two are related or not. I have tried the updated throttle linkage and it didn't help a thing. The only thing it did do is make it so I can't get full throttle no matter how I adjust it and the pedal is way to stiff. I am going to try the stock front linkage with a late 97 two spring rear linkage to see if at least I can get full throttle back. I think I need some help it's not fun to drive my favorite toy any more and I don't like it. #ad

 

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Just thought about my signature might be nice to see in this case.

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1996 4x4 3500 4. 10 5spd, Diesel Dynamics stage 2 injectors, #5 TST plate, Govoner spring kit, 16cm2 housing with 4" exhaust, Cummins exhaust brake, US Gear overdrive, Grover air horns, Mag-Hytec cover, and more.