The info in my signature is up to date, with that in mind, I have an issue with the engine stumbling. No matter if I'm in the 0 setting or 3 setting it will stumble on acceleration from around 55 mph. When if you slam the throttle. In the stock setting it doesn't do it as bad. Feels like a miss. Now if I place the quad in 4 or 5, it will stumble until it kicks the wire tap in and then you can feel the miss ever so slightly. There are no codes, I have changed out the injector lines all 6 and torqued them down 28lbft. I was thinking it was the old lines, maybe they were just over torqued, no luck. This issue is really prevalent when towing. Now with no codes, could it still be the VP? Also I have noticed that my pressure gauge that I have hooked to the fass is bouncing. Still holding 20psi at the fuel pump, but pulsing. Just confused on where to go. Don't want to start throwing money at it. The VP is 14 months old and has 45k miles on it now. Any advice appreciated, thanks in advance.

6 hours ago, pepsi71ocean said:

You have a manual, I believe it will be easier for you to run higher pop pressures then me, being i have a built auto. I would say 320 should be good for you, My 100's I wish i popped higher to 325.

But If you do get them repopped, please let me know what the side effects are, and drivability issues as I'm writing up an article for this for future use.

Thanks Pepsi. What side effects have you seen?

HATS OFF TO DAP!!!!!!

I just got home and my injectors were delivered. According to the paperwork, 4 of the 6 wouldn't even pop. The 2 that did were in the 270 range. They cleaned and installed 6 new nozzles under warranty and repoped them for 330 average.  Thanks again to DAP, and I will update once they are installed. Probably be this weekend. 

24 minutes ago, mossyoak71 said:

HATS OFF TO DAP!!!!!!

I just got home and my injectors were delivered. According to the paperwork, 4 of the 6 wouldn't even pop. The 2 that did were in the 270 range. They cleaned and installed 6 new nozzles under warranty and repoped them for 330 average.  Thanks again to DAP, and I will update once they are installed. Probably be this weekend. 

How old were your injrctors?

5 minutes ago, Marcus2000monster said:

How old were your injrctors?

I got them last year on black Friday.

How many miles were on them?

I've been having a dead spot when engine is cold at around 1000 rpm not sure if it's injector related but kinda seems that way. Mine were supposed to be poped to 320, it's only been few months and few thousand miles. Not sure what to think yet, may wait till next spring when it's wormer and see if it gets better. Could be pop pressure related. Kinda getting tired of taking injectors out though. Want to drive it for 100k without doing anything but oil changes ha ha.

4 minutes ago, Dieselfuture said:

How many miles were on them?

I've been having a dead spot when engine is cold at around 1000 rpm not sure if it's injector related but kinda seems that way. Mine were supposed to be poped to 320, it's only been few months and few thousand miles. Not sure what to think yet, may wait till next spring when it's wormer and see if it gets better. Could be pop pressure related. Kinda getting tired of taking injectors out though. Want to drive it for 100k without doing anything but oil changes ha ha.

You probably just jinxed yourself because you said that lol! 

10 hours ago, Dieselfuture said:

How many miles were on them?

I've been having a dead spot when engine is cold at around 1000 rpm not sure if it's injector related but kinda seems that way. Mine were supposed to be poped to 320, it's only been few months and few thousand miles. Not sure what to think yet, may wait till next spring when it's wormer and see if it gets better. Could be pop pressure related. Kinda getting tired of taking injectors out though. Want to drive it for 100k without doing anything but oil changes ha ha.

I had about 30,000 on them and I just wonder if it's something in the system that's causing it cuz I've got a set of DDP ones and they act up really bad so I don't know. Anybody out there with any experience with this like to know if there's anything that could cause it I'm new to Cummins so this is all a learning curve

I had ddp 120s that were smokey and laggy too. Terrible. They were brand new full price from xdp. Even checked  over a second time by ddp. Went with Don at f1 diesel per Jacobs advice and it's the best thing I ever did. My 220s from Don smoke half as much as the ddp 120s. I went with the size don reccomnended. Jacob says f1 or infinite performance or Haley speed. That's all I'd ever go with now after my experience

Edited November 15, 20186 yr by rogerash0

Like im going to be next on injectors. My DAP 7x0.0085 are getting a bit dirty, haze, and faint misfire. I've got close to 100k on them.

11 minutes ago, Mopar1973Man said:

Like im going to be next on injectors. My DAP 7x0.0085 are getting a bit dirty, haze, and faint misfire. I've got close to 100k on them.

IMO that isnt much miles and those should last longer but being DAP prices are so good i dont mind changing every 100K. 

I'm in the middle of reading this topic "Testing Injector Pop Pressure in the real world" and starting to understand the pop. You know trying to get a powerstroke person to forget everything they know and learn the Cummins is not easy. I guess it's the simplicity of the Cummins that's the hardest to digest, like taking a step back in time.

4 hours ago, Marcus2000monster said:

IMO that isnt much miles and those should last longer but being DAP prices are so good i dont mind changing every 100K. 

Might not be worn out but pop pressure to low and getting inefficient.

I have a couple sets of new nozzles for 98-2002 24v by Mark Wilson (from the original PDR outfit) laying around somewhere.

 

Every set of nozzles/sticks (close to 2 dozen across various generation trucks) I've run/installed made by him have been outstanding.

 

Shoot him an email via his website dieseltuff.com and get his advice on nozzles/mods/POP pressures.

 

Very competitively priced, pretty much a next day turnaround, and he is not a middleman but a builder.

 

Couldn't be happier. 

My boss has a set of RV275s laying on the shelf that I might see if he will sell. I’ll prob send them to DAP and have ham repopped and tested. I think they’re used. 

On 11/13/2018 at 10:25 PM, Marcus2000monster said:

Thanks Pepsi. What side effects have you seen?

 

So far only positive ones. But some have reported stalling issues when in hot weather. But so far this is not something I have seen.

Man what a difference. Smoke is all but gone, idle is quite, and it does run a lot better. Thanks DAP for the quick turnaround. 

4 hours ago, mossyoak71 said:

Man what a difference. Smoke is all but gone, idle is quite, and it does run a lot better. Thanks DAP for the quick turnaround. 

 

Can I ask what pop pressure they were at, what you set them to, And anything else you noticed, things like turbo lag, or smoke, spool up. and if there is any mpg difference? I noticed you have twins?

Edited November 19, 20186 yr by pepsi71ocean

52 minutes ago, pepsi71ocean said:

 

Can I ask what pop pressure they were at, what you set them to, And anything else you noticed, things like turbo lag, or smoke, spool up. and if there is any mpg difference? I noticed you have twins?

well when I send them in four of them wouldn't even pop two of them were like 270 range. There's really no turbo lag cuz I have twins they light pretty quick. Smoke is just a haze I'm very pleased with the smoke for once now I can control it and stop and go traffic. Granted I haven't put the wiretap to it yet but these injectors are more than what I wanted which is a good thing cuz I can dial and back with the quadzilla. I did have an issue with stalling at first but then I looked at my tune that I had done for the 7 x 12 and they were starting off at 75% so I update to start off at 80% at 1 psi and I haven't had an issue since. Also I had them pop to 330, and they got the average to 329.

Well here we go again, I just want to take my 44 magnum 300 grain hollow points and just see how this engine will hold up!!! To say I'm disgusted is an understatement. Granted the engine idles better, and I do get better milage. The power is there when I need it. I just don't like feeling like I'm on a bucking horse going down the highway. With no weight on the truck, I thought it was just a tire out of balance. Today I hooked up to my gooseneck 20' and it bucked to no end at 55mph. Fuel pressure is good at a constant 18psi. The only thing I haven't changed is the VP44. It is driving me insane, and to top it off I can't figure out how to data log the quadzilla. When you hit data log it just shows the highest number reached in each category. The numbers never change. So how do I know when the data log has started? Getting really frustrated with this issue, and I know I won't be able to tow my 5th wheel like this. Seems to be getting worse. No codes, so anyone got any suggestions.

So reworking injectors helped and now it's back to same thing?