Schwache Leistung==> nicht LLM! (Solution) | Posts 16+

@Jean,
Okay, so, regarding the climate, that would make sense, but it's different in my case.
Sure, here's the translation:

'For example, the lack of initial acceleration is only present in the first...'
1/2 kilometer, if it's cold, otherwise not at all.
No problem.

@Thorsten,
With the rotation speed, it's just a matter of...
I've been distant from you. The main problem is, how...
As mentioned above, the maximum speed is...
missing. I only mentioned the gear speed.
So that you understand that the transmission/engine is far from reaching its limits in terms of RPM. No more power is available above 180 km/h!
I can shift into the 4th gear at a significantly higher speed (as mentioned above).
'Rev it up! So, the engine doesn't have a revving problem, unlike many people in the forum who have a longer 5th gear.'
'I want to say that in my case, the 5th gear is nowhere near the rev limit, but I'm not getting any more power!'

With other models (with a longer 5th gear), the power seems to be there.
to be!

Best regards, Holger.

Hello Jean,

ich bin zwar kein Fachmann, und das mit der Klima zieht gewiß auch Leistung, ich glaube aber nicht, daß eine Anfahrschwäche damit etwas zu tun hat, ich denke eher, da klemmt was, oder ein el. Prproblem.
I also have Climatronic, and it has happened to me before that I stalled my diesel engine, although only on certain days (days when it wasn't so hot in the morning). (By the way, my first diesel was surprisingly the one that did this!)
I think it's like this for me:

It takes a moment after starting the car for the climate control system to activate (as I said, it's automatic!!). I don't know if it's different with a regular air conditioning system, where it might be controlled manually.
Suspected cause: The engines are likely having issues with the oxygen or air-fuel mixture.
I noticed it very strongly in Switzerland (at an altitude of about 2000 meters).
It barely responded to the accelerator at first, and it was difficult to get it moving.
It takes some getting used to.

Regarding tire pressure:
'Our Passat feels like it's floating' with this tire pressure. It drives well with a pressure between 2.0-2.3 bar when the tires are cold; anything more feels uncomfortable (STOCK TIRE SIZE: 195 R15).
'I'm still using the original, low-quality tires on the front, but I've already switched to Michelin tires on the rear. With winter tires from Continental, the car feels quieter and more comfortable!'

Holger:
So, I'm not an expert.
But I think you should be happy that your car can go up to 180!

I think it's subjectively a little better for me now.
Vielleicht ist es ein el. Valve?!

I suspected the famous AGR solenoid valve.
I once removed the connector, drove the vehicle, reattached the connector, and tapped it gently with a screwdriver in case it was stuck. I repeated the same process with the LLM (likely referring to a different component).
There's probably some kind of solenoid valve there that's somehow directing the vacuum. Try tapping it gently, or maybe it's stuck.

As I said: it might be something else entirely.

This morning, while driving on the A65 (which was mostly slightly downhill), I felt like the car had more power than usual when I reached 180 km/h. Only time will tell if that's really the case.
'Does anyone know which electric valve is connected to the LLM (with those thin pressure hoses)?'

So long .
Thorsten.

Hello Jean,

ich bin zwar kein Fachmann, und das mit der Klima zieht gewiß auch Leistung, ich glaube aber nicht, daß eine Anfahrschwäche damit etwas zu tun hat, ich denke eher, da klemmt was, oder ein el. Prproblem.
I also have Climatronic, and it has happened to me before that I stalled my diesel engine, although only on certain days (days when it wasn't so hot in the morning). (By the way, my first diesel was surprisingly the one that did this!)
I think it's like this for me:

It takes a moment after starting the car for the climate control system to activate (as I said, it's automatic!!). I don't know if it's different with a regular air conditioning system, where it might be controlled manually.
Suspected cause: The engines are likely having issues with the oxygen or air-fuel mixture.
I noticed it very strongly in Switzerland (at an altitude of about 2000 meters).
It barely responded to the accelerator at first, and it was difficult to get it moving.
It takes some getting used to.

Regarding tire pressure:
'Our Passat feels like it's floating' with this tire pressure. It drives well with a pressure between 2.0-2.3 bar when the tires are cold; anything more feels uncomfortable (STOCK TIRE SIZE: 195 R15).
'I'm still using the original, low-quality tires on the front, but I've already switched to Michelin tires on the rear. With winter tires from Continental, the car is quieter and more comfortable to drive!'

Holger:
So, I'm not an expert.
But I think you should be happy that your car can go up to 180!

I think it's subjectively a little better for me now.
Vielleicht ist es ein el. Valve?!

I suspected the famous AGR solenoid valve.
I once removed the connector, drove the vehicle, reattached the connector, and tapped it gently with a screwdriver in case it was stuck. I repeated the same process with the LLM (likely referring to a different component).
There's probably some kind of solenoid valve there that's somehow directing the vacuum. Try tapping it gently, or maybe it's stuck.

As I said: it might be something else entirely.

This morning, while driving on the A65 (which was mostly slightly downhill), I felt like the car had more power than usual when I reached 180 km/h. Only time will tell if that's really the case.
'Does anyone know which electric valve is connected to the LLM (with those thin pressure hoses)?'

So long .
Thorsten

Test result:

Hello,

Here's the promised result:
After driving approximately 250 kilometers on the highway last night, here's what I believe is the final impression:

Translation:
Acceleration: The car starts to accelerate around 1300 RPM, pulls strongly up to approximately 190-195 km/h, and reaches a top speed of around 200 km/h at 4060 RPM.

The boost or pressure of the turbocharger is no longer comparable to what it was before. When the car accelerates from approximately 140, 150, 160, or even 170 km/h, it starts to pull, not like a Porsche, but it accelerates smoothly and consistently.

Fuel consumption after the update: at speeds of 140/150 km/h, the display shows approximately 5.5-6.2 liters (previously, it showed over 6.8 liters).

The consumption isn't much lower, it's just fun to accelerate now, but if I ease off the gas while maintaining the speed, it uses significantly less fuel => it must have something to do with the turbocharger being engaged now.

That might mean:

A) Possibly, the stuck electromagnetic valve for the EGR system, which was disconnected a few days ago, is now allowing for better airflow!!!!????? (A fixed value instead of a variable one may mean that the problem of the known air-fuel mixture in the PD system is being mitigated?)

B) The electromagnetic EGR valve may be 'stuck'.
C) The electromagnetic valve, possibly related to the LLM (likely a specific component or system), might be 'stuck' and be transmitting some kind of 'counter-pressure' (or not, function unknown).

That's my opinion, as described above. Nothing has been proven, but it helped me (hopefully permanently).

My suggestion: Just tap on the solenoid valve! It might help, and it won't cost anything.

So long .
Thorsten.

Hello, fellow sufferers.

Since Thursday morning, I've been experiencing the same problem again, as usual.
Weak acceleration, somehow less power, it doesn't seem to pull very well...

I'm slowly getting annoyed with this car.
By the way, the magnetic valve was supposedly tested.
According to the workshop's instructions, the valve will be checked to see if it's making a rattling noise, or if it's not.
(It had never made that noise before! It always switched on with the vacuum.)
Was if the solenoid valve was actually stuck?
Good advice is expensive once again.

So long .
Thorsten.

Hello guys,
I have a G4 TDI PD (AJM) engine. Even before any tuning, it could only reach a top speed of 205 km/h on a flat road (215 km/h with GPS), although the official paperwork states a top speed of 192 km/h.

Hello,
I'm experiencing the same problem. I have a Bora, manufactured in 2000, first registered in December 1999, with engine code AJM and a 6-speed gearbox.
Initially, shortly after purchase, when it was a one-year-old car, it could reach up to 220 km/h if it was running well, otherwise it consistently reached 210 km/h.
'Now, even on relatively easy hills, he's running out of breath, and his top speed is only 185-195 km/h, with a rare occurrence of reaching 200 km/h on good days.'
LMM values are within normal limits.
In my opinion, the fuel consumption is too high, approximately 7 liters on average.
It can't be the fuel filter; it was just replaced, along with the timing belt and air filter, during the inspection.
Has anyone of you found a solution yet?

Best regards,
hanomag2001
Wishing everyone a smooth and wrinkle-free journey.

Hello,
I'm experiencing the same problem. I have a Bora, manufactured in 2000, first registered in December 1999, with engine code AJM and a 6-speed gearbox.
Initially, shortly after purchase, when it was a one-year-old car, it could reach up to 220 km/h if it was running well, otherwise it consistently reached 210 km/h.
'Now, even on relatively easy hills, he's running out of breath, and his top speed is only 185-195 km/h, with a rare occurrence of reaching 200 km/h on good days.'
LMM values are within normal limits.
In my opinion, the fuel consumption is too high, approximately 7 liters on average.
It can't be the fuel filter; it was just replaced, along with the timing belt and air filter, during the inspection.
Has anyone of you found a solution yet?

Best regards,
hanomag2001
Wishing everyone a smooth and wrinkle-free journey.


Hello Hano,

The only thing I can recommend with a clear conscience is to try to go to a large workshop, but if possible, speak to someone who knows what they're talking about and explain the problem.
Make sure to have it scanned with a VAG-Com diagnostic tool, and it *must* be the newer model; the older ones won't detect intermittent errors.

I'm still experiencing intermittent power loss, sometimes with no acceleration at all, and a fuel consumption of around 9 liters on the highway. At other times, it's almost normal, with a fuel consumption of around 7 liters on the highway!

Recently, a sporadic mass airflow sensor (MAF) failure was diagnosed in my car. I suspect the issue is with the wiring harness connected to the MAF sensor or the control valve located above it, which is on the left inner fender of my Passat.

Unfortunately, due to a lack of funds, I am unable to have the error investigated again at this time.

PS: I've now driven almost 98,000 km. Does anyone know how much a 'major' service costs for a Passat AJM PD with 85 kW?


Sol long and good luck .

I hope I have explained the situation reasonably well; I am a bit overwhelmed by this strange error story!!

If it runs smoothly and pulls well up to around 4000 RPM, but then doesn't go any higher, then everything is likely fine.
Eventually, the acceleration stops, and as far as I know, the car is officially registered with a top speed of 193 or 195 km/h.

After all, it's a diesel! It can't run at 250 km/h... even the V6 TDI models are only officially registered for a top speed of 217 km/h!

Hello Kenny,
Okay, I understand that the registered top speed and the fact that a diesel isn't a sports car are clear. However, if you know that it was previously running at 210-220 km/h according to the speedometer, and now it's only reaching around 185-195 km/h, then in my opinion, something is wrong with the vehicle. It is still reaching its engine speed, though.

Hello Holger,
How can you tell how fast you're driving by looking at your car's climate control?

Best regards,
Hanomag2001

I also have the AJM engine, but with the MJ01 gearbox in my Golf, which has 6 gears. It only goes up to just under 200 km/h now, whereas it used to be almost 220 km/h initially.

Based on my understanding of the values, the LMM (mass airflow sensor) readings are at the lower limit. I'm going to get the correct Torx screwdriver (with a hole) to remove the LMM and verschandeln it. Right now, I have the opportunity to test the engine every day, and I'll be able to tell if anything has changed.

The "sometimes it works, sometimes it doesn't" issue sounds familiar. Sometimes you can tell the Golf wants to run, but most of the time, it just seems like it doesn't feel like it.

The air filter, diesel filter, oil, etc. have all been replaced recently (as part of the 60,000 km service).

A colleague has the same car with the same engine (Passat Variant). Without any modifications, it reached a top speed of 200 km/h (approximately 124 mph) at around 4200 rpm. The AJM engine becomes less responsive above 3200 rpm, and above 3500 rpm, it requires patience, which is normal.

I experienced the same symptoms. (No more power/acceleration above 160 km/h).
Max, approximately 185 (km/h, speedometer reading).
For me, it was the mass airflow sensor.
Since then, things have been taking off like a rocket. Of course, also thanks to the ATU box.
According to the speedometer, it's running at approximately 215 km/h again. The actual top speed is 205-208 km/h (according to the climate control display).

Best regards, Alex.

Hi,

I have a Golf 4 TDI with 115 horsepower and 4motion, and I'm experiencing the same or a similar problem. The mechanics at the workshop tested almost everything; they tried a different mass airflow sensor, a different engine control unit, etc. I was then told that the turbocharger was faulty. The turbocharger was replaced, but the car still couldn't reach its top speed. Then, they gave the car a software update, but that didn't work either. The master mechanic now says it could only be the pump injector unit. VW has offered a quote for replacing this unit, which would cost me 1400 euros. However, I'm not going to have it done because the mechanic previously said it was probably the turbocharger, and it wasn't, and I had to pay 500 euros for nothing. I'm slowly coming to terms with the fact that my Golf probably won't go over 185 km/h anymore (it used to do 205 km/h). In any case, I won't buy another TDI; I find them too unreliable. When the engines are running well, they're great, no question, but mine isn't running properly, and I don't want to spend 1000 euros to get the top speed back.
Regards,

Flo.

Hello,

...and then it turned out that it wasn't him after all, and I had to pay 500 euros for nothing.
Have them reinstall your old chargers and refund your money. You shouldn't have to pay for a misdiagnosis!

Okay, unfortunately, I'm experiencing similar problems with my Golf IV TDI/GTI 6-speed. It runs really well from around 1600 RPM, but starting around 2200-2500 RPM, the power gradually decreases. The top speed is approximately 190 (sometimes 200). I previously had a Passat 3B TDI with 110 horsepower – I wish I had that engine again...
The lack of power above 2500 RPM is so significant that a higher gear in the lower RPM range performs much better!
'I've also noticed that when I slightly ease off the accelerator once I'm in the higher RPM range, the engine seems to pull a bit better – meaning there's a noticeable increase in power.'
The mass airflow sensor (MAF) and the throttle position sensor (TPS) have been replaced, and I personally cleaned all the conceivable connectors.
The problem still exists - just like for many thousands of others. There must be a solution, right???

Best regards,
Sure, here is the translation of the text from German to English:

'Det' is a German word that means 'it'. It is a pronoun that is used to refer to something that has already been mentioned or is understood from the context.

For example, in the sentence 'Det er en fin bil', the word 'det' refers to the car.

'Det' can also be used to refer to something that is not specific or that is not known. For example, in the sentence 'Det er viktig å være snill', the word 'det' refers to the general concept of being kind.

Here are some other examples of how 'det' is used in German:

* 'Det er en vakker dag.' (It is a beautiful day.)
* 'Det er en god idé.' (It is a good idea.)
* 'Det er viktig å være forsiktig.' (It is important to be careful.)
* 'Det er ikke alltid lett å være ærlig.' (It is not always easy to be honest.)

I hope this helps!

Stoney wrote:

Hi, I have a Golf 4 TDI 115 HP 4motion, and I'm experiencing the same or a similar problem. The mechanics at the workshop tested almost everything: a different mass airflow sensor, a different engine control unit, etc. They then told me that the turbocharger was faulty. The turbocharger was replaced, but the car still couldn't reach its top speed. After that, they gave the car a software update, but that didn't work either. The master mechanic now says it could only be the pump-injector unit. VW has offered a quote for replacing this unit, which would cost me 1400 euros. However, I'm not going to have it done because the mechanic previously said it was probably the turbocharger, and it wasn't, and I had to pay 500 euros for nothing. I'm slowly coming to terms with the fact that my Golf probably won't go over 185 km/h anymore (it used to do 205 km/h). In any case, I won't buy another TDI; I find them too unreliable. When the engines are running, they're great, no question, but mine isn't running properly, and I don't want to spend 1000 euros to get the top speed back. Regards, Flo

That's nonsense. No other car can help against stupidity when it comes to repairs.

eindet wrote:

The lack of power above 2500 RPM is so significant that a higher gear in the lower RPM range pulls much better! "I've also noticed that when I slightly ease off the accelerator once I'm in the higher RPM range, the engine seems to pull better – meaning there's a noticeable increase in power." The mass airflow sensor (MAF) and the throttle position sensor (TPS) have been replaced, and I personally cleaned all the conceivable connectors. The problem still exists - just like for many thousands of others. There must be a solution, right???

Hi,

...and it's called: first, completely check all engine data using VAGCOM - and, above all, interpret the values with understanding!

If, for example, the air mass value is too low despite a new mass airflow sensor and correct boost pressure, the engine may be experiencing breathing problems: for instance, due to a clogged intake manifold (due to soot and oil buildup) and/or debris from a damaged catalytic converter blocking the exhaust.

Possible causes include: incorrectly adjusted camshaft, clogged diesel filter and/or air filter, possibly a malfunctioning pre-lift pump, etc.