ESP VP37: Faulty injection control causes over-revving

Hello,

I'm having the following problem (Renault Scenic, 1.9 dTi, manufactured in 1999, ESP is the well-known VP37 engine):

"The engine occasionally stutters, and sometimes the RPM briefly increases. Recently, it stalled while driving, but it could be restarted (the status of the warning lights was not precisely reported, as I was not the one driving)." The error often disappears for days and is completely independent of the outside temperature, engine temperature, or load conditions.
The error code in the system's memory indicated a problem with the "fuel injector adjuster" (according to a local repair shop, I haven't been able to access the data myself yet).
To be honest, I don't trust this engine. Something isn't right. The diesel filter is new, the strainer is clear, and this car has never seen any oil additives. If that particular problem isn't present, the bucket works just like it did on the first day.

So, I familiarized myself with the technology of this pump using the forum. I came to the conclusion that the displayed error is, at the very least, not responsible for the high-speed operation. And this error should trigger the emergency mode, but not shut down the machine, especially since the light for motor errors (what was it called again?) is not lit. I'm also not sure how French engineers program their control units.

I'm going to try flushing the pump with cleaner, just for testing purposes. Let's see what happens.

[Edit]
I just came across this while looking through some documents.

Symptoms: Jerky behavior in certain RPM ranges, with no other noticeable issues.
Common causes: only VP 37: worn injection pump, the metering unit is prone to jamming due to internal pump wear.

Sounds plausible. But as far as I understand the technology, the computer should be able to easily recognize and store that information, right?
[Edit]

Long story short: Does the displayed error match the actual problem, or is something else wrong? I have this feeling in my left toe, and I suspect it might be an electrical issue.

Best regards,

Fingers ([url][/url]http://www.fingers-welt.de{MARKER})

Hi,

I didn't want to keep the solution to my problem a secret from you.

[url][/url]

Keywords for forum search: VP37 quantity setting device, disassembly without OBD.

Hi,

Fingers.http://www.fingers-welt.de/gallerie/eigen/maschine/transport/autoschraubaer.htm{MARKER}

Hi Finger!

You can also buy a triangular nut.

I believe that ours is from Hazet, I'll check when I go to the workshop next time.

Hi,

An 8 mm socket will also work, and three corners need to be slightly rounded.
Regards,
A.

Hazet was not entirely correct; it is a Bosch product.

Part number: 0 986 612 605 "Socket wrench"

It has a 1/2" square drive on the back.

If my memory serves me correctly, Finger is the one who doesn't shy away from effort or setbacks, and who abstracts processes using the most unusual methods, resulting in things that are funny, interesting, and above all, very entertaining.

To put it another way: "The Finger," whose website has been entertaining me for a long time (I think it's great), isn't buying a key. He MUST build something himself .

While something like that might be fun as a hobby, if you rely on that activity for your livelihood, there's hardly any time left for experimentation. Especially when customers are already bothering you about how long it will take when they bring in the car .

hehe - yes - this homepage also amused me!!

I went to a Bosch service center, and they opened the screw for me. I then installed a new one, and that's it. Hopefully, I won't have to deal with that again anytime soon.

By the way, the thing with the oscilloscope isn't bad at all. If that really works, I could have saved myself a few hours of fiddling and experimenting... but you want to know how it works, and ultimately, you often end up with it better adjusted than it was with a fairly old pump.

Sure, here's the translation:

"Hello."

Hi,

Actually, you shouldn't even need an oscilloscope for that. If you measure the voltage at the specified points using a good multimeter and then readjust the pump to the same reading, it should work just as well.

Greetings.

Eike.