Golf IV 1,9 Tdi AXR ruckelt unter Last (Solution) | Posts 16+

Just a moment...

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from the previous owner MTM chip to 130 hp

Was was the stuttering always present? Due to software modifications or changes in certain performance-critical areas, the stuttering can cause very severe issues on the PD...

No, this shaking only started after a few thousand kilometers, it happened suddenly.
Until then, the engine was running completely smoothly, I have been driving it for about 45,000 km.

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According to information from another forum, there was also a reference to the PD cable

Possible.

Further points to check would be the fuse box on the battery (Gammel/malfunctions), relay "109" (please use the search function), and generally any changes made to the engine control unit.
For AXR, tuning does NOT need to be done by soldering in the control unit. However, some suppliers do this (due to copy protection sockets or simply out of ignorance). Working on the engine control unit can lead to intermittent contacts/failures, as well as water ingress.
However, the control unit for the Golf 4 is relatively dry and located under the plastic cover near the windshield wiper linkage.

Best regards, Rainer

Thank you for the tips!

- I inspected the fuse box above the battery > everything looks good
- I'll replace relay 109.
- I can visually inspect the MSG to see if anything is visible.
However, the chiptuning was actually performed directly by MTM, I don't believe they did any soldering.

What else I noticed in the log is that the value of the air mass (target) no longer increases at some point. Normally, with increasing speed, more air should be sucked in and the value should still increase? There is a lack of air mass.

How can it be that there is a lack of air mass?
The intake valve appears to be fully functional as desired, I have also logged the MWB 10, the intake and boost pressures are almost identical.

Here's also a verschandeln log of 003 008 011.

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What else I noticed in the log, the value of the air mass (target) no longer increases at some point

Normal, the target air mass is only relevant at partial load.

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Hmm, I can't really tell the difference between shaking and vibrating; it's so strong that the entire dashboard vibrates when I press the gas pedal harder. So, the frequency will also increase.

Before you get a worm, someone should try it out to be able to distinguish,
whether the error is caused by the engine, the drive shaft, or the gearbox.

Is the performance normal?

dieselschrauber wrote:

What else I noticed in the log, the value of the air mass (target) no longer increases Quote: Normal, the target air mass is only relevant at partial loads.

Oh, I made a mistake, I meant air mass (Is), but it's not working.

@Car Service
That's certainly right what you're saying, but if it were the gearbox or the driveshafts, it wouldn't be emitting a strong smell from the exhaust, would it?
Those who have previously test-driven the vehicle, including certified mechanics, believe that the problem is likely related to the engine, transmission, or gearbox, rather than the drivetrain.

Okay, here's the log excerpt I meant: The air mass (IS) is actually too low!? The engine speed is continuing to increase.

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Air mass (IS) is too low

Yes, Loading Pressure is also.

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Quote: Air mass (IST) is too low Yes, the loading pressure is also

.

It seems that the air mass is already decreasing, while the boost pressure is still increasing, as I correctly interpreted the log.

Are the camshaft and hydraulic system still okay?

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Are the camshaft and hydraulic system still okay??

I can't say that, so far I haven't had any problems.
but I haven't really looked at them closely.
I had a chat with my friend, who's a car mechanic, and he said he's adjusting the camshafts.


How does the airspeed indicator work?
I bought one from another person, who also had 190,000 km on it. Not the one that was also defective, but the one with the lower power, 101 horsepower, didn't have any jerking.

Where else could it be?
Can I still contribute something related to logs?

Thank you, Steffffen, I've reviewed the logs using his Excel template:

How old is the fuel filter, actually? Air pump excluded?

So, the fuel filter is basically new (10TKM)
I cannot rule out the possibility of air in the system, but the MWB23 seemed to be in good condition!


Today, the PD cable was replaced > No solution found
Relay 109 replaced with a new one > Didn't help

"It's definitely a bit depressing for me, maybe I'll have Bosch check the vacuum pressure on the VTG-dose next time during their service."

Maybe the VTG mechanism is also jammed, and the low air pressure isn't providing enough air intake!?

Hello,

Regarding problems with the VTG, it is noted that the charging pressure builds up well at the beginning of the vehicle's acceleration, but then drops off.

Please check if the vacuum chamber at the VTG adjustment of the loader is sealed, and consider the possibility that tightening the VTG could cause a leak in the chamber itself.

You can check this in the following way:
- Using the basic settings mode of measurement block 10 or 11 (please refer to the documentation), enable/disable the VTG (Voltage) while the motor is running.
- The path of the VTG adjusting rod on the loading arm must be approximately 1 cm here. Is the path shorter, to check for mechanical faults at the VTG?
- Using a flat-jawed clamp, squeeze the hose towards the VTG (Valve Tube Gate) valve, so that no more air can pass through. Wait. The VTG valve must remain fully closed. If it opens slowly, it is likely due to a leak in the hose or the vacuum chamber.

Greetings, Rainer

Instead of the default setting, you can also apply a vacuum directly to the container.