Today I removed the 100hp edms and put the stockers back in, guess what it still had a bucking or shudder at 1800-2100 rpm and still very noticable. Next I remeved the EZ and boost elbow, it still does it but barely, now that it has no performance mods on it at this time its not very fun to drive at all. I still thinh its the vp44 because when it bucks its when its under load or using the torque of the engine, once I get the speed up to cruising (relativly no load) its fine, likewise in the lower gears and while taking off its also fine. So when the vp44 is calling for for max fuel , making the max torque, it shudders and bucks. Still no codes, what should I do, I think ill take it back to the dealer where I got it from. They have only sold 4 new diesels 2 of them to me so i dont know how they will handle a problem like this.

thanks
wrangler

 

1. The dealer will deny you have a problem.

2. See #1.

3. You said you were able to slip the original clutch. Here's a shot in the dark: did you glaze the flywheel and not have it resurfaced?

 

When I got home from work tonight I checked the codes because it seemed very very very SLOW (80 mph top speed) maybe because I just removed the injectors and ez THIS IS THE FIRST TIME A CODE HAS EVER CAME UP, P1693 and P0234. The search is disabled so I cant try to look them up. I hope this will lead me in the right direction to fix the problem.
wrangler

 

P0234 Turbo Boost Limit Exceeded
P1693 Code detected in ECM/PCM (companion code)

Did you remove the boost elbow when you removed the EZ?


phox

 

My APPS had a bad spot and it acted just like yours, I'd reset it and it would work good a couple days and then start bucking again at about the same throttle position, 15 lbs. boost at 60-65 mph, the tach would bounce about 200-300 rpm when bucking, no codes for a long time, when it did throw the APPS code I knew it was acting up then, just had a flat spot until I pumped the pedal a couple times. Replaced the APPS and runs smooth at all rpms. APPS cost 300. Should say bellcrank assem. with APPS.

 

Yes I didnt forget to remove the boost elbow, it only reads 23 tops on my guage and last week I unhooked the ez completly and still had the injectors (100hp) in and it made almost 30 lbs boost and didnt give a code, could this be a delayed reaction? The more I think about it (which is alot) every time I unhook the EZ it runs pretty **** smooth with or without the injectors. Has anyone heard of a problem like this with the EZ. Im going to order a comp tomorrow and try it, I need to be able to turn it off when I tow my 22' BAJA HAMMER , I dont like the black smoke on the right side.

thanks to all who have chimed in
wrangler

 

The performance boxes amplify the signal to the computer, so when your box is on it will amplify the stutter, with the box off you will barely feel it. Does it run bad at a constant rpm with light load? does it quit if you apply more throttle? does it quit if you apply less throttle? this is symptom of APPS going bad.

Yes injectors will throw overboost code.

 

does anyone know if the apps is what causes the problem with the pedal, because my truck is acting the same way.

 

just glanced through this thread. have u tried at apps reset?

 

I did and it still does the same thing. Is it the apps or would it be something else.

 

i have a edge comp in my truck and when it is cold out sometimes i get a shudder. in my case it is called timing shudder. i noticed you said its barley noticeable when you take out your ez. do a search for it

 

I will chime in on this from my experience. After thinking I was happing a apps problem I found out that a slipping clutch don't take off like a gasser does mine is grabbing from take off it will slip grab slip grab then go and last night I nailed it in 4th and i waited a second then grab also out side of the box have you check too see if you had any drive line slack possible ujoints?

 

well with no codes and before jumping into a new pump, id really look into that tps(throttle position sensor(aps sensor), that will cause dead peddal and surgeing on the highway, wich could cause a shudder, has it ever fell flat on its face before, were you stepped into it and it just didn't go, or been travling at low speeds and have it drob back in rpm?

 

I read this entire thread and I am having the exact same problem with my 02' HO. It only does it when it's below 40 degrees outside. Light acceleration or to the boards, it runs smooth. Here is what we've tried on my truck:

Map sensor
apps
cam sensor
boost sensor
Edge comp disconnected
I.P.
ECM
turbo
injectors

It doesn't throw any codes when it shutters, but if it does it real bad, you can hear it coughing repeadily back through the turbo. It did this with the stock turbo and now with the HTT. We've also hooked the computer on it and drove it around. All the parameters are within spec, nothing out of the ordinary.

We have racked our brains with this issue. It's just like you say, take the injectors and/or chip out, it doesn't do it nearly as bad, but seems like the more power added, the more it amplifies the shuttering.

I don't know if your problem is exactly the same, but it sure sounds like it.

 

did you pull the codes out of the pcu and the ecu? i believe, if memory serves me correctly, that the ecu is last, and that is where the 0216 and the 1688 codes (vp death codes) are stored. are you sure you checked both computers? just thinkin out loud here