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

OK thank you very much for all these informations. I like to learn. Thank you.

OK. Thank you very much. I like to learn.

Thank you

I changed the tps. My engine speed is running at 750. I remember that before changing the vp44 the idle was around 840. I wonder what is causing this? because that is the problem. a lower engine speed. It starts well, stays at this speed. I don't know if it is electrical or mechanical. Can I increase the idle speed like on any old car with a screw? Is the ecm playing tricks? Why don't I have any error codes, even when it stalls? It's crazy....

I'm going to change my lift pump to see. I don't think it'll change anything. But just in case...I also changed the T-joints of the return line of the VP44 at the rear of the engine. It's annoying to change them. I don't know if I should tighten them or not.... could that cause the stalling?

It annoys me because I love my truck. It helped me a lot, especially to get my wife out of a ravine with her old beetle.... now I'm wondering if the ECM is playing tricks on me too? It's hard to know, especially since there are no codes as I already said..... the worst is that when it stalls I put it back in park or neutral I turn the key and it starts again as if nothing had happened. I engage 1st, if I accelerate it stalls again, if I leave it idling with the speed it moves normally.... it's a crazy story.... and the gears change well too, I have no jump, no slipping, no heating.....

I still think it’s your injectors @jeremyf9806 I don’t trust any of the mainstream builders anymore, there is almost no quality control-quality control doesn’t fit their business model. I’d either have a trusted local shop set up some oem Bosch injectors, or order some Mach 1’s from Flux Diesel.

Maybe you re right. But I've changed them 2 times. One was rebuilt to give me 75 more hp. The others are new Boschs that I bought from RockAuto.

1 minute ago, jeremyf9806 said:

The others are new Boschs that I bought from RockAuto.

They are stock OEM injectors - correct?

• John

Yes, I bought bosch on Rockauto

Here's what I did today. First, I changed the complete TPS. Then I tested the continuity of the TPS cables, from the VP 44 to the ECM. Then I changed the lift pump. In the end, it stalls after a long time while it's running. I noticed later, maybe it's a dream, that it stalls on a downhill slope. If I drive in neutral and accelerate slightly from 750 to 1200 rpm, it stalls as if it's drowning in diesel or out of diesel. I restart it, it restarts...

I still have these small diesel leaks between the connections of injection lines 1, 3, 4, 5 and the tubes. I tried to loosen and tighten, at the time there is nothing, it appears after acceleration I think.

Theseare that I bought on rockauto : :BOSCH 0432193630

These are the same number that I had pull to change them

All the continuity tests I've done are good. I forgot to mention that I even tested the lift pump cable, and it's good.... It's so confusing...

I dont know if the ecm could be the problem or if these are these small leaks, or if it could be the return line on the tee....

I checked Rock Auto and I see that they are genuine Bosch OEM injectors. I don't think the problem is injectors.

You do need to get this figured out as you don't want your wife to have to spend too much time in a ravine with an old Beetle.

• John

Edited yesterday at 09:01 PM1 day by Tractorman

Looking back on the thread, Mike mentioned this a few days ago

“Remember Bosch stock injectors are NOT made as a set. You could have low end of 293 bar you the high end of 327 bar. This can affect idle performance. Ihigh suggest AGAINST using stock injectors. Buy+50 HP from any good injector shop and they are balanced as a set within 2% of flow rate”

I still think it’s very likely both sets of your injectors have been mismatched. I learned this the hard way over the past year or so. Had your same stall issue after I ordered and installed a matched set from the same outfit that did Mikes injectors. Pulled them out, had 2 shops pop test them and they ranged from 290 to 330 bar (both shops showed same numbers on each injector). Pulled them back out, send them back and told them specifically what I wanted (310 bar-I believe they set them up at like 308 normally) they sent them back and I had them independently tested again and they were still off-not as much but by then I was mad. Keep in mind this was a “premium” set, not their normal budget injectors. I tossed those and went with the Mach 1 from Flux bc the owners are still directly involved with building their injectors and they’re perfect. For whatever reason my 2000 model is very sensitive to matched/balanced injectors and it sounds like yours is too.

This shows my truck stalling after shifted intro reverse. On a slight hill, if the initial fuel input didn’t create enough force to back it up it would just drop and stall. The pics below show the idle RPMS from 2 different tuners. Roughly 750.

OK I understand. I dont know what can I do. Because remove all again and again.... wahou.....

I think I m going to keep the 75hp to control. If I understand the pressure for these injectors must be at 310 bars ? Not less not more?