Hi excuse me to disturb you, I have a 98,5 dodge ram 2500 cummins. I ve just changed my vp44 by a rebuilt, I ve changed too injector by rebuilt 75 HP, changed the 6 lines by New, 6 connectors tubes seals, the fuel filter, put transparent hose to see if there is bubbles but no, and I have a problem. The truck start good, the idle doesnt move ( like apps dead), when I accelerate the engine cut off. I restart , it restart good. Before I forget I have installed before I changed all that, a superchips cortex programmer.... I found à little leak on my new injection lines ( 1, 3 4 5) at the connection with tubes... I have no code ... I make a video to explain it... what do you think it could be.... the little leaks? The programmer? The injectors? Thank you for your help

Mopar1973Man - Note

Attention: Our new member is from overseas and their native language is French. He's using a translator app from Google. Please be clear and explain your ideas well.

Mopar1973Man - In this video he's asking about the tach dipping down but it doesn't stall.

That is strange I have no code..... I have some little leaks between the end of the injection lines, I thinked it was this produce air which go inside by here and less pressure .... but I dont understand....

This happens when the idle speed drops, sometimes it cuts the engine and sometimes not at all....

Excuse me to disturb you but I live at Monaco, and in my country there is nobody to repair this truck. I ve just changed the vp44 I bought at Rockauto.com, because these are the only who ship in my country and with less taxes.... So maybe I missed something when reinstalling everything.... but I dont think... only when I install the injector lines to the connector tubes.... it was difficult to reposition them.... so thank you very much for your help.....

Mopar1973Man - You'll see the engine stall easily... What is the cause?

Edited May 5May 5 by Mopar1973Man

I moved @jeremyf9806 started as a PM to me and I'm trying to jump start him on the website for help. I marked up his post to help out a bit. He is trying to figure out the stalling issue on the free rev of the engine.

I've suggested checking the valve lash and any electrical between the ECM and VP44 for a basic ohm test just to verify.

Edited May 5May 5 by Mopar1973Man

OK. Thank you very much. So before I forget, I ve too 2 seals on return fuel line behind the 6th cylinders, and 2 seals not 3 on the T of the return line. Do you think it could be a problem .... thèse are oem mopar seals. I didnt know if I can put other seals or modified all the return lines.... so I found 2 mopar seals for the T. and little expensive... 75$ for 2 little seals.....

@jeremyf9806 , you have an unusual problem. Can you give some history on the parts that you replaced. Which parts were replaced before the problem and after the problem. What was the reason that caused you to replace the VP44 injection pump?

18 hours ago, jeremyf9806 said:

what do you think it could be.... the little leaks? The injectors?

Since the engine starts quickly and idles smoothly, leaks or injectors are not likely to be your problem. The leaks need to be repaired and they could make the engine hard to start after it sets awhile, but they are not making the engine behave as you describe.

18 hours ago, jeremyf9806 said:

what do you think it could be.... The programmer?

The programmer is a possibility. I would completely remove the programmer electrically.

I would double check the electrical connection to the PSG on the VP44. Make sure that a pin has not been pushed back inside of the connector.

Regarding the new re-manufactured VP44 injection pump that you installed - is the PSG new or re-manufactured? was the re-manufactured pump tested on the Bosch 815 test stand by the rebuilder?

Assuming that the engine was operating normally before you replaced the VP44, I wouldn't worry about checking the valve lash.

• John

Edited May 6May 6 by Tractorman

The leak is at the end of injector lines between the connector tubes n1 3 4 5, and the bolts which connect the lines..... I think but I m not sur I have misaligned the lines.. and I have changed too all the 6 injectors, by rebuilt with 75 hp more, with new seals and copper seals, maybe it s not adapted or calibrate I don t know....

And for the programmer, I ve bought several years ago a programmer superchips cortex, and sometime I ve installed torque program to have more torque , before my vp44 breaks... maybe the New vp44 could not support this, and I need to re install in stock.... it s a supposition.....

I have bought the vp44 at rockauto .... because these are only who can ship at my country and with less taxes .... If I was in US it would be more easiest for me to repair my truck, you have everything.....

But it s like that..... That I remember when I replaced the vp 44 7 days ago , the keyway are the same 035..... and I was happy for that. It was rebuilt by delphi apparently. So the psg5 I dont know if it was rebuilt too or not .It seems new, the wires too.....

Exact details are important here. In your mind you know exactly when you did everything - we don't, you have to tell us. Please answer each question.

• Why did you replace the VP44 - what was wrong with it? What were the symptoms?

• Did you replace injectors, tubes, and lines before or after the VP44 replacement?

• Did you use the key that came with the re-manufactured VP44 ?

• Have you inspected the electrical connector to the PSG for pins that could be pushed back?

• It is hard to know with the video what you are doing with the throttle. I think it is clear that the engine idles as it should. When you step on the throttle in the first video, did you make the rpms go past 3,000 rpm, or did that happens on its own?

Please, don't skip any questions.

Thank you,

• John

• I replaced the vp44 because I broke down at the gas station. I found a code p1689, the dodge would no longer start. I did a hot test to confirm that it was the pump and not something else..

• No, I ve replaced injectors, tube , seals, line in the same time with my new vp44.

• The key is the New with the new vp44. It s not the old. I just say it s the same that old.

• No I ve no inspect the electrical connector.

• The rpm pass at 3000 because I push the pedal with my hand. And I dont understand why thewhen the idle go down more under 600 rpm , and in the second vidéo I push slowly on the pedal and you can see the rpm when it goes down , it cut off the engine. It s my problem. Why.....

Thank you for your help.

My problem is why when the idle goes down either it goes down below its rpm or it turns off the engine. Before it broke down it never did that to me. Maybe I missed something.

Just a passing thought? What have the injectors been pop too? Typically the stock injectors are 4500 psi or 310 bar. Now if a injector is popped too low say around 290 bar it may create a possible stalling issues. Remember for every 10 bar you go down from 310 bar you are adding 1 degree of advancement to the fuel timing.

Understanding this i opted for 320 bar 7x0.010 on Beast. Slightly retarded but I can make up for that in my Quadzilla tuner.

Edited May 7May 7 by Mopar1973Man

I dont really know. I BOUGHT THEM on ebay us. This is URL

eBay

1998.5-2002 FITS Dodge Cummins® 24V PERFORMANCE INJECTORS...

Find many great new & used options and get the best deals for 1998.5-2002 FITS Dodge Cummins® 24V PERFORMANCE INJECTORS 75HP AND 150FT LBS at the best online prices at eBay! Free shipping for many...

I bought them because I would like little more power without paying too much, and modify the engine or ecm.... because I know on this dodge model ecm is little fragile and I dont want to change it because it s little expensive ....

Do you have a local diesel shop that can test your injectors popped pressure settings. I know factory is 310 bar but many rebuilders tend to cheat and drop the pop pressure attempting to add duration to the injection event. Typically here in the US is about 15 dollars per injector to be tested and reset the pop pressure properly.

Again just a thought?

Yes .... I think it s more easy to change them again than to control them..... because I saw the price is 40 $ for 1 injector....

Is there a tool I can buy to measure pressure, and is it affordable?

In France thé mecanic is very expensive ( taxes, workforce the price of parts)

Ouch. Dang dude!

True backyard me panic congrats to you sir. Yes there are injector pop testers looks like a bottle jack with a high pressure line on top. You'll need the collar for Cummins ISB injector to hook up your injector to the line. Here is a home made testers you can build. Check around there are injector tester out there.

https://www.vevor.com/injector-nozzle-tester-c_10329/diesel-injector-nozzle-tester-pop-pressure-quality-dual-scale-gauge-w-filter-p_010783068030?adp=gmc&utm_source=google&utm_medium=cpc&utm_id=13170729522&ad_group=123973570953&ad_id=522794665616&utm_term=&gad_source=1&gad_campaignid=13170729522&gbraid=0AAAAACq8bLUXF8f0n8A4cSDtb5-6E1BDV&gclid=Cj0KCQjw5ubABhDIARIsAHMighZJAaCPmzZWXF7fSGB7xMYT2jNokKPY8Xea5-F22SfBf5-b8tMthwYaAoCKEALw_wcB

Edited May 7May 7 by Mopar1973Man

OK. So I think saturday I will put stock program the ecm to check if it works....

I dont want to loose my eyes with a chinese tester....

2 hours ago, jeremyf9806 said:

My problem is why when the idle goes down either it goes down below its rpm or it turns off the engine. Before it broke down it never did that to me. Maybe I missed something

Thank you for the details of your repair history along with the timeline. This helps.

If I am understanding correctly, the engine runs fine now except for the brief low idle or the stalling. Have you driven the truck? How does it drive, other than the brief low idle or the stalling?

I am beginning to think that it is injector related.

• John

Yes, I drove the truck for 5 km. When I accelerate, the truck accelerates normally without any problem. The problem is when it returns to its rpm, it either drops below the rpm or it stalls like the videos.

I ve just buy 6 new bosch injectors at rockauto.... when I will receive them, I will installé them to see if my problems continue or not.... Maybe you ré right the injectors rebuilt I ve bought are not or bad calibrated some are at 295 bars instead of 310 bars.... I keep them and one Day If it s the problem I would take them to a specialist....

Hi everybody, I ve just finish to install new bosch oem injectors.....

I ve not tested the truck because it s raining and it s night.....

So tomorrow I will see if the problem continue or not.....

I ve control the vp44 harness to see , but there is no problème.....

Hello, I returned the Dodge to stock, changed the air intake sensor as well, charged the batteries fully. I restarted, the vehicle starts, but it seems to take 4 seconds to find its idle and stabilize. I drove for about 5 kilometers, it has not cut out yet. I let it reach its operating temperature. Maybe the tps has problems. I don't have any codes... at least I can't read them with my little scanners.... it's not a drbIII, which I would have liked.... too expensive for me.....

https://youtube.com/shorts/kva2LAikrEY?si=mi1WerZPDY71A0AO

Hi everybody, it s ok. The truck works now..... intéressant is no cut off.... The culprits: rebuilt injectors 75hp more, and tps ( I don t understand why it worked before... electronic 😁😁, like the vp44 😓😓).

Thank you very much for your great help ! !

If one Day you go at Monaco send me a mail , it s with great pleasure !

Glad to hear that everything worked out and thank you for reporting back.

• John