01 5.9 Cummins starts, runs, no accellaration
 

I have had this 2001 Dodge 3/4 ton 4x4 5.9 Cummins 24 valve turbo diesel for almost 5 years . I'm a plumbing contractor so , I keep this truck loaded with tools , supplies , and I pull a 3500 lb Bel-she trailer with my mini-excavator a couple of times a month. I ask a lot from this truck, and it's a hoss. 296,000 miles auto transmission. My problem I'm having is that the past few months , the truck will be going along , and suddenly just fall flat on it's face, and right before you think it's going to die , it picks back up.That was before last week, I went to a job , limped it half way there and all the way back. I put in in my shop and started checking anything and everything. I replaced all of my battery leads with some 00 welding leads + and - both I checked the codes by using the key in ignition and on off, on off, on P1693 is the only one I'm getting , now. Earlier in the week I got the 1693 and P0122 . Replaced the APPS , same symptoms. Starts right up , idles great, start to push the accelerator , and it will almost jump up to 1400-1500 RPM and fall hard right back to about 1000-1100 and stay right there. It smokes when it is put under a load . The truck had a quadzilla adrenalin chip in it when I bought it. I disconnected it , when it started all this . Truck is bone stock,vp44 rebuilt 3 yrs ago. I've worked on and researched this to where I almost want to sell my truck. Please help me :argh::s:

Well if you have done a lot of research on these trucks you have probably seen where these injection pumps like to have good fuel pressure at all times.
Do you have a fuel pressure gauge?
What is your pressure?
Do you have an aftermarket fuel system?

You said the truck fell on its face now when you said bad do you mean that The pedal almost felt dead?

When you free Rev the truck does it spoke it all does it pop?
Hopefully we can keep this rolling get you figured out as soon as possible:c:

I just bought a gauge last night. Install today . I also installed a airtex fuel pump last night. By fell on its' face , I mean, I could be going any speed at all and all of the sudden it's like it just dies. No power no acceleration, nothing until it picks back up. It has never died on me though. When it's at idle , it's fine , but as soon as you try the accelerator , it's like it wants to go , it revs up to 1400-1500 rpm real fast , but just as fast it goes back to a constant 1000-1100 rpm . No more no less. It has only a couple of times "popped" right at first when I started it, but then idled fine. I have checked every wire in the engine compartment. Ground wires too. I'm really stumped . I've seen a couple of similar threads on these symptoms , but I have not seen a solution . I would be very grateful for any help I can get. Thank you for your time. There is not enough time in the day , I really do appreciate you allowing me to occupy some of yours !!!:s:

The truck does smoke when you raise the rpm. I haven't even thought about taking it out of the garage. It probably wouldn't make it like it is. Like I said , the truck is all stock, and I do keep a good maintenance routine. The pump that I got has between 14 and 29 psi. Do I need a bigger pump? I'm kind of new to a diesel if it's not able to dig . It must be the plumber in me:argh:

thats good pressure, its when they start too fall below 13-10 that you should worry, or go higher than low 30's at WOT, especially being stock. The popping is strange, like a backfire pop? Can't help but think the pumps the culprit, thats a weird spot for it too be idling at 1000-1100, is your foot still into it when it does that? or only after you've let off?

There's a small range of fuel pressure that you need to be operating in while using a VP 40 for anything below 13 PSI is considered bad anything above 20 psi at Idle is considered bad. 13–20 is all the range you have to play with

I agree this sounds like a injection pump issue

The truck usually idles at about 750 + . When I was talking about it idles at 1000-1100 I meant with your foot in the pedal. Not 1000 at normal idle. I picked up a obd2 last night , but it wouldn't read everything I got P1689 and P0216. The other day it was 1693 and 0122 from the dash . When I had to change the pump last time , it wouldn't run at all. Why would it run and idle if the pump is bad ? I have a friend that's bringing his scan over this morning. I'll report back with the findings . Thanks again

Well , sorry for they delay on the fuel pressure . I checked the pressure last night , just a footnote , the truck stars up better than it has in a year or so. Fuel pressure at idle is 8-10 psi when you open the throttle it goes down to 5-6 psi. the truck is not throwing . My friend brought his scan tool over the other day , the only codes were 1693 , 0216, I really need get this thing fixed , injection pump or whatever , the truck needs to go to work. Thanks for any and all advise and suggestions .:argh::argh::argh:

I would start with a new lift pump. There is a bunch of them out there, take your pick.
Then if that fixes it great! If not than you may be needing a vp-44

This truck does not have a lift pump , did not come with one . It does have an aluminum "block" that bolts right up to where a pump would go , but it is only a pass thru for the fuel line . I did put a pump in its place but it did not make a difference, But I am not sure of my wiring of the pump. Since there was not one (stock) so no wiring harness. I tapped the pump wires into the fuel heater , on the side of the fuel canister .I figure I'm not going hunting AGAIN this weekend and fix the buggy:s::td:

How do you have fuel pressure with no lift pump?

It has the in-tank pump that's it. That's how It's been since I've had it

That would be the lift pump.

I just bought a 01 that is having same issue. Truck has 78000 miles on it. It sat for an extended amount of time. Truck smoked like a train when first stared. I removed the fuel filter to find almost an inch of what looked like snot. Cleaned filter cup and replaced filter. This helped greatly with smoke. Now truck has dead pedal. Purchased recommended in tank fuel pump from advanced auto. Removed tank and cleaned it well. With pump in tank I have Bypassed lift pump. Still I have dead pedal,and four codes that appear when I cycle the the key three times 1693,0230,1689,0216. I have disconnected both batteries for 30 min and reset the apps sensor. Didn't change a thing. My question is with pump in tank and lift pump not connected will this cause problems with the computer by it not recognizing the lift pump? Any advice would be greatly appreciated.

For starters, the "recommended" lift pump is really not what is recommended on here.
#1 lift pump for most people here is going to be a FASS fuel system,
#2 on the importance list is going to be to install a fuel pressure gauge, and watch it, like a hawk!
No more than 20 psi, no less than 15 psi.
From the sounds of it, your vp44 is going bad. 0216 is a vp "death" code, mix that with a dead pedal and you have a real good chance of a vp that is on its way out.
If you are replacing the vp, it would be idiotic to not install a good lift pump, and a good fuel pressure gauge, none of these are cheap. But it should be your last time throwing a vp in it for a while

Thank you sir. I will be installing fuel pressure gauge this weekend.

what would be the best solution , as far as the lift pump is concerned . bypass the pump in tank or get another fuel tank that doesn't have the pump in it? I have pretty much figured that the injection pump has to be replaced . This will be the last time for a long while I hope. after 3 fuel pumps (in tank) and 2 injection pumps., I'm just about done !!! is it possible , or would it help to put a lift pump where they usually have one . Where is the best place to run the wiring ? As far as it functioning like it should. Thanks

But a FASS fuel system and a ddt sump, you will then have a completely different fuel system from the tank to the vp, between both of them it will have all the hoses needed, the FASS will come with its own wiring harness that ties into the engine harness on the driver side of the engine, back about 4/5 the way, and down 3/5 of the way you will find a grey plug that the FASS hooks too, it will also hook to the battery, it also comes with its own fuel filter/ water separator :tu:

I Re-checked my wiring last night, I found the grey shielded wire with 2 wires in it , was pretty toasty in the middle. It's the one that goes from injection pump to the ecm. It was not shielded for 6" on both sides. I replaced the wire with a protected (heat) wire from napa, but this wire was not shielded. Does it matter? After I replaced it , reset apps etc... It fired right up, better than it did, idles fine 14 psi fuel pressure ,when you accelerate ,1000 rpm that's it pressure climbs a little. I really don't want to replace the IP if its not out. Could it be the CKP ? it's a bear to get to. Can I test it someway ? Still banging my head:argh::argh::argh:

Well after many headaches, from banging my head, I believe I have found my problem. The data link wire ( the grey shielded wire) had been getting warm over the years , I replaced it , and the connections to the injection pump. and presto . I do think that I'll try to find a new injection pump wire connector though. Thanks for all the help . I'll still be looking to get the fass system pretty soon . :tu:

I believe I have fixed my problem. After a new "in tank" fuel pump , which was not bad , but between the +- data link shielded wire and the plug that goes into the back of the injection pump , we are up and running again:jump: I'm still getting a "flat" spot when I'm moving at various speeds though. Hope it's just trying to relearn the computer . Going to find out today. Look out Bambi I'm heading your way pretty soon:tu:

Cummins loss of acceleration
 

When my 03 did that it was the throttle position sensor I had to replace which was 400$ and fixed the problem over a year ago never done it since. It would just happen out of nowhere. Sounds like exact same thing mine did. But I do not know if 01 has the same set up or not. I'm no expert is why I found this site.

03 shares the same tps sensor, but it has a different fuel system

I have been driving the truck this week, I'm waiting on a TPS to be delivered , but the truck starts (rough at first) then after warming up it does o k but I am still getting the dead pedal . I have to either let off the pedal or kind of pump the pedal until she goes, it's a pain but I think that the TPS should remedy the problem. I also believe that the shielded wire , (data link + -) has or had a lot to do with it. I am having trouble finding the wire NAPA has not found it yet for me . does anyone know where to get it?:humm:

every pump i have had with a dead pedal shortly bombed

that's what I'm expecting. :td: But , I'm looking at the bright side, I've already got my new exhaust , Going to order a Fass system including the IP then it ought to be good for another 300 thousand or so. I 'm grateful for the advise and suggestions

Well after I had to have my truck towed home night before last , on the way back to a jobsite< had to pull into a church lot and shut it down. Sounded like a can rattling around in the engine. The 2 outside threads of the fan belt were gone. wrapped up around the pulley(s) . unwrapped them, put a new belt on it , the starter (NEW) spins but, does not grab the flywheel . or that's what it sounds like. :s: I can't take to much of this new 1/2 ton, no gear shift knob having , 4 door hemi... HELP

Well, the torque convertor is done, I think that will cover the noise(s), and maybe a speed sensor, but, before I put it on the road it's fuel upgrade time and exhaust. I am kind of stumped though. My 01' stock Cummins does NOT have a lift pump. If I mount one where it normally goes , where should I connect the wire from the lift pump ? or does it matter? I am not going through this again , I hope. I already have the pump and exhaust. Been plumbing way to much !!! Want to go hunting !!!:dang:

Well still having issues , I installed new injectors from DSS , also a poormans sump , 1/2" line to anew aftermarket pump (air tex) that I had . New . my return leaks at the tee sometimes . where is the best place to tie it back in ? also , the truck runs great but, it is hard to start after I shut it off unless I let the pump cycle for a while . I'm getting grey /white smoke when I start it up. fuel pressure is 16-18 wot or idle ,I 'm turning 300,000 this week . thanks for any help. it is greatly appreciated .

That leaking return T is allowing air into the injection lines. White smoke on startup=air and hard starting. It's a sealed system, and it's got to stay that way. :w2:

I would also recommend resseting the apps, sometimes with the problem you were describing with the wiring the ecm can lose it's reference points for throttle position creating flat spots or reduced travel inputs. Resetting the apps is free, easy, and just might help, if you replace the unit it still needs to be done.