Passat TDI (110 PS) / Still no performance despite replacing the air mass flow sensor!

Hello everyone!

My Passat TDI (110 hp), built in 10/97, with the AFN engine, doesn't produce the expected power. Top speed on the highway is approximately 150 kmh. Even less up here.

I believe that the 235mm tires are also to blame, and so I installed a chip.
installed. (Speed-Buster) Afterwards, the car had its power back. On the railway, speeds of around 205 kmh and endless acceleration.
During a long highway trip a few weeks ago, the speed suddenly dropped from 170 km/h to 120 km/h. Then, on the mountain, the trucks overtook me.
(how embarrassing
I was at a rest stop and tried to find the problem. After the engine was restarted, the car ran normally again until the next full-throttle acceleration.
I tried the game 5 times, and then I removed the chip, because I suspected the error was there. But even without the chip, the car didn't run any better!

Upon arriving home, I had the fault memory read out at the VW service. Result: Error LMM. Unfortunately, I cannot provide the exact error code.

Subsequently, I replaced the LMM with an LMM from an auto parts store.
Performance without chip like before, with chip (with the old setting) significantly better. But a few days later, the performance drop on the highway while accelerating occurred again.

Now I have installed a new LMM again. (This is my third one...) It is also a used part. In a separate compartment, the function was checked. (Everything is OK.)

The car still doesn't have proper power. When I accelerate in 3rd or 4th gear, the turbo kicks in suddenly around 1900 RPM. Without the chip, the car has almost no power.

I have already checked all the vacuum hoses, replaced the fuel filter and air filter. Unfortunately, without success.

Regarding VW, I initially don't want to go to them, as they tend to replace parts (like the O2 sensor, turbocharger, etc.) based on suspicion, without actually finding the root cause of the problem. Estimating repair costs is very difficult.
Some people from the forum have also left a lot of money at VW, and the
The car still isn't running.

Is there perhaps an experienced TDI (Technical Diving) enthusiast in the Remscheid/Solingen/Wuppertal area who could help me in my desperation? (Measuring pressure)
Even helpful tips would be very helpful to me.


I wish you all a wonderful Monday!
Best regards, Gerd.

Hi

"The VTG (load control) on the AFN system often malfunctions, causing the engine computer to enter a reduced power mode until the next engine start.

Maybe you can draw a useful approach from this:

/viewtopic.php?p=1207#1207

For the VTG dry check:
Detach the hose from the filling nozzle and, using a large syringe and a short hose, suck the contents from the nozzle.
Pay close attention to the membrane rod: it should be able to be smoothly and delicately moved into any position without jumping or hooking, with a total stroke of approximately 1 cm.
Probably, you will find something else... then --> see above.

Hello Ulf!

Thank you for your quick response.

Since I'm not exactly a professional mechanic, I need to first get the {ITEM} in.
Manual: Find the parts 'Hose from the air intake + membrane rod' I will try this tomorrow.

I also read through the other contributions.

Nevertheless, I would be very grateful for practical assistance in the areas of Remscheid/Solingen/Wuppertal.

I am also happy to receive any other advice.

Is there a turbocharger repair shop near me?
What costs will I incur if the turbo (VTG) is defective?
(Material / Labor costs.......)

Thank you, Gerd.

[Translating...]

Hi,

wie lange, d.h. wieviel km fährst Du Deinen Chip?

Gr.W.

Hello Wilhelm Busch!

I have been using this chip since approximately August 2001. By then, I had already driven the car approximately 20,000 km.
After chip installation, approximately 40,000 km. (Under optimal performance and normal fuel consumption ) The vehicle is driven 6 times per week, approximately 2 times per day, covering around 25 kilometers each time. (This means it is always started from a cold state)
Furthermore, I also travel a lot by train. (If possible, I also sometimes go a bit faster to clear the cat's litter box...)
Since 8,000 km, my car has been experiencing absolutely no performance issues.
(also auch mit einem Chip, der entfernt wurde)

The car has now accumulated approximately 130,000 km.

Best regards, Gerd.

[Translating...]

nur so als tipp. ich denke, dein ansaugkrümmer ist von innen mit blowby-öl und abgas versottet und dadurch ist der querschnitt reduziert. Prüfen kannst du das entweder manuell indem du die Abgasrückführleitung zum A.krümmer abbaust und mit dem Finger mal im Loch rumrührst. Falls da schlammiges Zeug dran ist s.o. oder du schnappst dir ein Diagtool und ließt Meßwerteblöcke konkret die 008. da stehen begrenzungsmengen drin. motdrehzahl/wunschmenge/dremobegr./ rauchbegrenzung. vergleiche die beiden letzten mal . 3<4 auf meeresnullniveau. oder wohnst du im Himalaya?

Hi zusammen

Quote:

I think your intake manifold is clogged with blow-by oil and exhaust gases, which has reduced the cross-sectional area. You can also check this manually by disconnecting the exhaust backflow line to the A. manifold and then stirring around with your finger in the hole.

I would prefer to perform this test by removing the intake pipe before the manifold and then looking into the manifold, because this way I can see the actual intake air path instead of the (relatively unimportant) exhaust intake channel.
Additionally, you have the AGR valve right in front of you, and you can also visually check its ease of operation.

Hello everyone!

I have been on a business trip for a few days, and therefore now
First, perform the 'leak test' on the power outlet.

Since I am not an automotive locksmith, I first had to find the charging unit.
I then performed the test. (The engine was off!)
With considerable effort, the suction rod moved up slightly while vacuuming.
I wouldn't exactly call him/her/them sensitive. After vacuuming, the rod immediately went back down, as if a strong spring was pulling it from below.

Is this okay?

The thick hose, which goes from the LMM (Manifold Absolute Pressure Sensor) into the airbox, was slightly oily in the area around the airbox. (Not oily sludge or anything like that)

I think, I'll probably have to get the car inspected by VW.
Please provide me with a few tips on how to handle workshop costs.
narrow down. I'm concerned that the garage will first replace everything that looks like it's causing a problem. (LMM.............) One example would be replacing a ladder or something similar.

In the event of a stuck VTG (Variable Transmission Gear), is it possible to repair it?

Best regards, Gerd.

Hi

Quote:

With considerable effort, the suction rod has moved up slightly during the suction process. I wouldn't exactly call him/her/them sensitive. After vacuuming, the rod immediately went back down, as if a strong spring was pulling it from below. Is this okay?

The total distance is approximately 1 cm. To get "all the way up," you naturally need to suck harder than for the first few millimeters, due to the spring inside the container.
For testing, I always use a large syringe (50 ml or more), and it's too cumbersome for me to suck the liquid out with my mouth.

Quote:

The thick hose, which runs from the LMM (Manifold) into the intake manifold, had a slight amount of oil in the area around the manifold. (Not oily sludge or anything like that)

It seems it wasn't about that, but rather about the intake manifold, because from then on, soot from the AGR (Exhaust Gas Recirculation) system starts to come into play.

Quote:

I think I'll have to get the car checked out by a VW mechanic. Please provide me with a few tips on how to handle workshop costs. narrow down. I'm concerned that the workshop will first replace everything that appears to be faulty. (LMM.............) One example would be replacing a ladder or something similar. In the event of a stuck VTG, is it possible to repair it?

As much as possible from here

/viewtopic.php?t=3011&highlight=vtgmembrandose

self-check/handle!

"It was exactly the same for me, when I was on the train at around 150 km/h, suddenly an emergency stop. In my case, it was the turbo hose, it had a crack. You can hear it if you stand in front of it with the hood open and someone presses the gas pedal. You'll hear a strange hissing sound. It also took me quite a while to find it, the crack was exactly on the bottom and, to top it off, it wasn't cheap! (76€ for the stupid hose)"