Diesel cleaner

Hello,

My TDI is still chugging along through everyday life. You probably know my story: fluctuating idle speed, jerking between 1400 - 2000 RPM...

Okay, here's the translation:

'I just read the following on tdi-ruckeln.de:'

If you experience rough idling, which is likely caused by a malfunctioning fuel quantity control unit, I recommend using the method described in the forum, which involves cleaning the fuel injection pump with LiquiMoly diesel cleaner.
Simply extend the pump's inlet and outlet lines with two hoses, attach them to the container (LiqiuMolly cartridge), start the motor (allowing it to warm up beforehand), and slowly draw the contents of the container out while varying the motor speed. Run it up to maximum RPM - Attention: New timing chain?! - for about 10 minutes, then reconnect and get on the highway.
Furthermore, an additive that makes diesel fuel less viscous can be worthwhile.


What do you think about it? I think the idea is quite good, before I spend 1000 euros on a new pump (which I don't even have).
Here it comes.

What I don't understand. How can I run the engine for 10 minutes without using the ESP (Electronic Stability Program)?
What are the inlet and outlet of the pump? I'm connecting the suction line from the filter to the cleaning container, right? Then the engine sucks the stuff out and burns it, or what? Does the engine run for 10 minutes with that?

Thank you in advance for any corrections .

Best regards.
David.

Hi David,

I also tried that, even drinking two cans straight... it didn't do anything!!!


The principle is simple: you use the can instead of the tank for the inflow and outflow. Okay, so you need to make short extensions to the fuel lines and connect them to the inlet and outlet of the LM (Lambda) sensor housing, and then run the engine at varying speeds (or drive the vehicle).

Give it a try; if it doesn't work out, you've only wasted 10 euros. It can't be that bad.

Exactly my opinion: I have nothing to lose. I'll definitely give it a try.
Is Liqui Moly okay?
Sorry, one more silly question (I still don't understand): So, this stuff is a diesel replacement, meaning the engine runs on it and burns it? The return line is the oil leak line (is that what it's called? -> I still remember that from the Bundeswehr training course ).

Ciao.
David.

Hi,

Apparently, biodiesel is supposed to have a cleaning effect. At least, I haven't heard of any cases where the diesel filter got clogged after someone added a diesel cleaner to the tank. With biodiesel, it's supposed to be like that if you've been running on diesel for a long time and have accumulated a lot of deposits. Then the biodiesel could also dislodge the dirt in the pump.
'Practice makes perfect.'

Regards,

Eike.

DocSnydor wrote:

Sorry, one more silly question (I still haven't understood): So, this stuff is a diesel replacement, meaning the engine runs on it and burns it!? The return line is the oil leak line (is that what it's called? -> I still remember that from the Bundeswehr training course ).

Yes, this stuff burns like diesel. The label on the can says "...can also be used plain...".

Yes, the oil return line connects to the return port at the pump.

Here's the translation:

'I have the same plan, but unfortunately, I'm running into a problem: Where can I get this LM stuff? I've been to many stores that offer a wide range of LM products, but none of them have the 'Diesel Cleaner'!' So, where do you get it from if not by stealing?

I just bought a liter of this stuff. It's called Liqui Moly Speed Diesel Additive. I found it at our local Marktkauf store. They didn't have it at the gas station (DEA) here. It cost 12.01 euros.
Let's see if it makes a difference. I will report here...

Liqi Moly Diesel Cleaner, Container: 500ml, Article number: Number: 5170

Below.
[url][/url]
Enter "Diesel" in the search bar.http://www.liqui-moly.de/web/lmhomede.nsf/pages/index_produkte{MARKER}

but the only ones who benefit from such additives are the seller and the manufacturer!

Okay, if you're driving an old car, a lead replacement is quite good, but otherwise, the German language is so good that you don't need anything else!

Okay, for the mobile food stalls, biodiesel seems like a different story, but I definitely wouldn't put that in my car!

TDIBubi wrote:

but the only ones who benefit from such additive products are the seller and the manufacturer!!

Unfortunately, the Diesel Flush is not an additive but is used in its pure form, and it's certainly a relatively inexpensive way to potentially avoid an expensive repair (at least it's worth a try).

But I forgot -- it seems TDIBubi has money to spare, so one could easily afford a new pump (~1500 EUR).

By the way, this diesel cleaner can also be used as an additive, but in that case, I agree with your opinion (it doesn't do much or very little).

Okay, if you're driving an old car, a lead replacement is quite good, but otherwise, the German language is so good that you don't need anything else!


Okay, so, my 'old-opa-box(tm)' and my scooter are here, but they have a different opinion .

CU Gremlin.

Okay, here's my experience with this stuff:

Yesterday, I smoked half a liter (it took forever), and I was constantly adjusting the gas flow.

Right off the bat, the engine still stutters, but it's slightly less noticeable. However, starting the engine this morning at -8°C was a dream. It started on the first try and immediately ran at a stable idle speed. Also, the engine is now running much more smoothly and responds better to the accelerator.

Conclusion: It was definitely worth it. However, it didn't help me with my 'jerky' problem.

Best regards.
David.

DocSnydor wrote:

Yesterday, I smoked half a liter (it took forever), and I was constantly adjusting the gas flow. Right off the bat, the engine still stutters, but it's slightly less noticeable. However, starting the engine this morning at -8°C was a dream. It started on the first try and immediately ran at a stable idle speed. Also, the engine is now running much more smoothly and responds better to the accelerator. Conclusion: It was definitely worth it. It, however, did not help me with my

"jerky" problem.

Hi David,

That might actually help our colleagues who are struggling to get started.
How was the starting behavior like before? Were there ever any "accidental" good cold starts, or was that one good start definitely "sensational"?

@Bertil and other pump experts:
What could have happened then? Could the spray pattern have been improved by dissolving deposits, for example, at the nozzle openings?

ulf wrote:

@Bertil and other pump specialists: What could have happened then? Has the spray pattern potentially been improved by dissolving deposits, for example, at the nozzle openings?

The spray pattern of the nozzles may have changed because some deposits have likely cleared from the nozzle openings. Possibly, some deposits in the pump have been dissolved, but apparently not enough.
I'm thinking along the same lines as you.

ulf wrote:

That might actually help our colleagues who are struggling to get started.

.....I'll get my engine running...and if I fill the entire tank with LiquiMoly!!!

But a good tip!

Best regards, Christian.

Hello,

Quote:

This might actually help our colleagues who are struggling with the start of their projects...

I added the Liqui Moly diesel system cleaner some time ago.
The starting performance could have been better, although the can also stated that it "increases the cetane number."

Since I replaced the temperature sensor on the engine, the cold starting performance between 0 and 5°C has improved significantly.

Best regards, Rainer.