Engine/Transmission (1998.5 - 2002) heed help with kind of a sudder

[JMarkos]

Just got home from snowmobling, when I would get to about 20-28 psi of boost in what seemed to be 5th gear more than the rest it would kind of sudder or maybe a jerking, kind of like when you are running out of gas in a gaser, but when you give it some more pedal it would clear up and run fine. Bad gas, dirty filter, what do you guys think?



Thanks in advance.

 

[WyoJim]

Always change filter

Once back in 1973 I called a service truck out to my log job to see why my diesel log skidder was missing. He set about changing the fuel filter and I said "I changed that just yesterday". He said "Don't matter, when a diesel acts up thats always the first thing to do".



Well he was right, it fixed it, but I don't know why he couldn't have told me that on the phone and saved me the service charge.

 

[HeberRam]

Jmarkos... I would first do what Wyojim said , change out the filter. If that doesn't cure it you may want to check your fuel pressures, you may have a lift pump going out.

 

[Boost]

Mine is the same

Mine does the same exact thing as yours. Shudders, misses seems like its running out of fuel. Only at a certain throttle setting. Let off a little it goes away, full throttle and it goes away. I can feel it worse the heavier the trailer I tow. A couple weeks ago I was towing a 7000lbs trailer going up a long 6-7% grade and when it would miss it would actually throw me forward against the seat belt. I had a new lift pump installed with no change. Then i installed a fuel pres. guage and I never see less than 10psi. APPS, IAT, MAP all checked out OK and no codes set. I went for a ride with the service manager with a gizmo hooked up to the port below the ashtray. He was able to shut off each cylinder one at a time and that duplicated my problem. I will have a new vp44 installed in a couple of days so I will post the results of that. I am lucky in that I have a great dealership to work with. They go out of there way to help.



Rob

 

[JMarkos]

boost now that scares me, I just put in a new filter tonight, bought some fuel conditioner, and checked the map senser,helpfully mine will be easier. I did talk to the dealer today, he said it sounds pretty minor, I hope, I don't have time for this crap right now. Let me know how it works out. Thanks for the help.

 

[Diese1nut]

Hesitation

Markos

I hope Boost has found the answer because after going to six different dealers with the same problem the only advise I can give you is, SELL THE TRUCK!

The dealerships are useless and don't have a clue. If it wasn't for this same problem I would love my truck. I am still fighting with DC, and have yet to get it corrected. All I want is my truck fixed.

Look and search the post and you will be surprised at how many people have this same problem, stick or auto. No cure

If I knew of this problem before I would have looked for a good used 12 valve 98.

I wish you luck.

 

[rubberneck]

boost, keep us posted, this thing is driving me nuts, my symptoms are exactly as yours, only moderate throttle, and only 1500-1900 rpm, heavier the trailer the worse. i thought i read on another thread that somebody had put on a new vp44 but it didnt fix the problem. please keep us posted. if its not the vp44 then what ECM i guess. damm this sucks

 

[PROSTAR190]

Ditto everything above... . I would love to know what the problem is!!!! I am starting to think that it is the injection pump.

 

[WyoJim]

Well my 98 did the same thing you guys describe. At around 60 or 65 mph with the camper on it would feel like the wind was bumping it with little jerks. Speed it up and it would go away. It was the torque converter trying to slip and Bill K's valve body cured it.

Then I put the EZ on and it started doing it again at around 50 to 55. Jerk, jerk, jerk. Then I found out that it didn't do this with the EZ in the middle position. I still run the EZ on the far right because now that I know what does it, it don't bother me.

 

[RustyJC]

Fellows, I don't have a solution to this problem, but I've noticed that the Edge EZ has been mentioned on several threads as, if not a direct cause, at least an aggravator of this problem.



We've made several trips to the Texas Hill Country towing our 13,500 5th wheel since adding our Edge EZ (running on setting #3). We've had no problem whatsoever with surging, flat spots, cruise control hunting, etc. running anywhere from 60-75 MPH (2000-2500 RPM).



I guess the point I'm trying to make is that the Edge EZ itself probably isn't the root cause of the problem - if it were, I'd expect all trucks equipped with the EZ to exhibit these symptoms.



JM2CW...



Rusty

 

[RustyJC]

Fellows, I don't have a solution to this problem, but I've noticed that the Edge EZ has been mentioned on several threads as, if not a direct cause, at least an aggravator of this problem.



We've made several trips to the Texas Hill Country towing our 13,500 lb 5th wheel since adding our Edge EZ (running on setting #3). We've had no problem whatsoever with surging, flat spots, cruise control hunting, etc. running anywhere from 60-75 MPH (2000-2500 RPM).



I guess the point I'm trying to make is that the Edge EZ itself probably isn't the root cause of the problem - if it were, I'd expect all trucks equipped with the EZ to exhibit these symptoms. It's certainly possible, however, that the EZ could aggravate or amplify a problem or abnormal operating characteristic that already exists.



JM2CW...



Rusty

 

[rubberneck]

rustyjc, im not sure i have heard anyone blame it on the ez. Believe me, i wish it was that simple. Actually when i first noticed the shudder in my truck, i yanked the ez. problem was much less pronounced, however under certain conditions, it was still there. So i got a new ez box and tried it, still there. It seems the problem is not caused by the ez, but as you stated, can definitely agravate it. I have seen some posts on how the ez caused a shudder because it was causing torque convertor or clutch slippage, and that makes total sense. again, that is certainly not the ez's fault it just happens when you exceed stock hp on the original tc or clutch.

This problem is totally different than that, my truck will actually sputter/run rough if i simply bring the rpm up to @1800 with the truck in neutral. I have had it on the scanner, and all "seems" to be working fine, and no trouble codes, but something is definitly haywire. so i would agree with you, dont anyone read these posts and think we are flaming the ez, its a great box, and i could not count the number of people i know who are running it with absolutely no problems. We're not trying to blame anyone for this (except maybe dc for putting bad pumps?? ecms??? sensors?? in our trucks) it would appear that the problem is definitely in the trucks, I wish we could limit it to a certain bomb, believe me i would be the first to rip it off, but unfortunately, we have to sort this out the hard way, trying to find dealers who are cool enough to listen to our problem without jumping right up and blaming the mods.

 

[Kent Kuykendall]

Same Boat

I too am having a shudder. I thought it might be my DDUFM. Although the replacement DDUFM did help the problem some and this box gives me 3-4 psi more boost. The shudder is still there but not as bad as the original box. Sometimes it seems to be triggered by bumps in the road, or maybe related to the throttle and the right foot jigleing around while on the throttle. So I leaned my foot on the hump while I drove. With foot resting on hump and peddle. I think sometimes it helps but not always. My problem is worse at low RPM but will happen at othertimes as well but seldom when at heavey throttle use.



Has anyone replaced their "Crank Position Sensor"? I have replaced my Boost and Air Temp sensors but have not changed the Crank Position Sensor. Anyone have thoughts on this one?



Kent

 

[Boost]

update

Monday will be my 7th trip to the dealer for the same problem. The tech and the service manager have both said it is the vp44 and was told last Monday that a new vp44 will be ordered. The problem is the "tech line '' will not authorize and send a new pump without some more tests, they even want to try another lift pump even though it was already replaced on trip #1 and I never see less than 10lbs at WOT. The service manager is as frustrated as I am. I took it to a Cummins shop out of my pocket and was told it is a bad vp44. So hopefully they will be able to convince the tech line on Monday that it is the pump and one will be sent. I have considered trading it but would have to take to big of a loss. I will post what happens on Monday.

 

[rmknizner]

How do you test a VP 44? I would love to point the dealer in a direction that could solve my truck's problem, which is not as bad as a "shudder" but more of a midrange miss.



I, too would pay out of pocket to have a Cummins shop look at it.

About how much did you have to pay?







Thanks!



Bob

 

[rubberneck]

keep us posted

boost, keep us posted, it sounds like we have the exact same symptoms, and i am curious as to what other "tests" the tech line wants performed. It would be nice to take the truck to the dealer and be able to "hint" at what the he!! they need to check out in order to get a new vp44 authorized. Please let us know when they replace the vp44 and give us a progress note. I hope this is the answer man. until then i will be shshshshaking right along.

 

[Diese1nut]

Shutter

I to am waiting to here from the line tech.

I took mine to Cummins at my expense and the said it was the V44 pump. I called Cummins tech support and they to said V44.

The two usless local dealers won't do any thing. I have been complaining to DC for some time now and still haven't got a call back.

Cummins original thought was the APPS but where it still does it while on cruise control the said that wouldn't be it.

We naad a class action suit. Mabey they would then pull there head out of you know where.

 

[Boost]

lucky #7

After seven trips to the dealer for the infamous "shudder, stumble, hesitation... " a new vp44 has been authorized by tech line. The bad news is its on back order. But at least its going to be replaced. They have checked or replaced everything else that could be causing it. Again, I am lucky to have a dealer that goes out of there way to help, it seems like trying to pull teeth to get DC to admit that it is a bad pump. I will post when it is replaced and what the results are.

 

[rubberneck]

good news

boost, that sounds positive, i really hope this fixes your shudder, as at least it will give the rest of us an idea of what direction we need to go

 

[JMarkos]

Are all you guys seeing this empty or with a load? Mine has only did it this once and it only does it with a load, expecially in cruise. I will have to wait till the weekend to tow.