Alhambra 7N: Noisy Engine - Fix It!

Hello,

My new Alhambra DSG with a 170 hp TDI engine was incredibly quiet for the first few kilometers.
Starting at 700 kilometers (presumably on the odometer), it became louder. I have a strong rumbling noise in the 1200 RPM range. Unfortunately, this noise cannot be recorded.
However, there's now also a snorting sound that can be clearly heard in the appendix.
(Microphone 30 cm away from the head. No body sounds picked up by the microphone.)

He only does that when it's warm. Currently, the odometer reads 1300 km.
Is that a normal operating sound?
I removed the engine cover, and it seems like the noise is coming from the head. There's nothing loose that I can see from the outside.


Thank you very much!

Hi,
a) This is a warranty claim - take it to the dealer, without attempting any repairs yourself.
b) The buzzing sound is speed-dependent and sounds similar to what a small, faulty ball bearing might sound like, for example, from an auxiliary component or a roller. It's less likely to be a valve or a turbocharger, and probably not a sticking injector either.
Is the same issue present when removing gas and in the LL (Low Latency) mode?
hg
Herbert.

Hello Herbert,

'When idling, there's nothing unusual to hear. Based on the sound when accelerating, I suspect it's related to the injector. There's still a slight knocking sound after releasing the accelerator, but I'm not sure how quickly the fuel injection system responds to changes in throttle position.'

If you're feeling brave, try reaching for the serpentine belt tensioner.

My tension spring is now also making noises.
Once it makes a "qieck" sound when starting, and then you can hear it (well, I can hear it).

Since my Golf 3 TDI, I've had firsthand experience with belt tensioner issues, so I'm something of an expert on the subject.

m;

EDIT

After listening to it several times, I've come to dismiss the Spanner theory.
Is this about the "bubbling" sound caused by the small gas bursts at the end?

That sounds like "hot air," like something that couldn't possibly be caused by the tensioner.

The air and components labeled "from the valve cover" could refer to cyclones, oil separators, and membranes that are installed inside.

Hello Martin,

I'm referring to the loud, rattling noise coming from the nail, starting at 1100 RPM.

I just came from the doctor's office.
Soon, a rearview camera will be installed in my car. During this visit to the workshop, vibration dampers will be attached to the fuel injection lines, even though my car is supposedly not affected by this procedure according to the system.
I really don't believe that this can have any acoustic effect. The pipes are very solid, and when you put your hand on them, there's no audible change.
Subsequently, (even though it might not achieve anything - ...it will not achieve anything), the intention is to document the technical details and coordinate the next steps.

LOL, unfortunately, I can't see the tachometer in the MP3.

Vibration dampers are designed to prevent pipe fractures, not to reduce noise.
What a shoddy job... I might as well stick cotton wool in my ear... although that would actually dampen the sound .

m;

There's a report about a humming or booming sound coming from the 2.0 TDI engine. The cause is a rattling plastic part in the intake area. Isolating it with foam, etc., can help. You can test this while the engine is idling with the hood open, if a second person can bring the engine up to the relevant RPM. I found information about this somewhere on Motor Talk. Apparently, VW also searched for weeks without success, but it was actually a fairly simple problem to solve.

Best regards.
Christian.

Damn.

That's exactly what I did when playing golf – I wrapped the plastic sheet with the fabric tape around it. I just forgot about it.

m;

VW develops a great engine, and then it fails due to a plastic hose.
On April 23rd, I have an appointment at the workshop regarding the camera. They will also check the tires at that time. I won't be doing any modifications before then.

'My Octavia CR TDI also has this humming noise, but it's been there since the very first kilometer. The Alhambra only started making the noise after a few hundred kilometers.'

It's hard to believe that VW equipped its TDI engines in multiple model lines with this flawed component for years! This significantly devalues the entire vehicle.
Actually, I don't want to do much tinkering. I expect a solution from Seat. A different part needs to be installed there.

This box in front of the air filter seems to be a kind of cyclone separator. I also think it might be noisy and could potentially create standing waves at certain frequencies. How necessary is this component?
My cars have never had a separator like this before. I would like to close it off at the rear.

Do you mean this part here?
/viewtopic.php?t=15151&highlight=3c+intake

that reliably performs its function in vehicles like the Golf 5, Passat 3C, etc.

Yes, it's about this part.
However, the Octavia is much more flexible than the Alhambra. Perhaps the Passat is different again. Maybe it's also attached differently to the crossmember.
What I also notice about your picture is:
The separator on the Alhambra seems to be positioned much deeper compared to the air filter box. It's not as easily accessible as it seems from your description.
There might be acoustic resonance between the air filter housing and the separator. Certainly, the air pulsates at the rear outlet of the separator. Perhaps an acoustic mat could be placed on the air filter housing, not to dampen it, but to reduce reflections.

For the 1.9 TDI engine, there's a different pipe available, although it addresses different noises.

Fat on a Golf 2, naturally aspirated diesel style .

/viewtopic.php?t=24026&highlight=1k0129618bj

m;

To improve the audibility of the hammering sound, I adjusted the equalizer settings.
Please provide the text from the attached file. I need the text to translate it from German to English.
It doesn't sound much better than live. The recording doesn't capture it well.

It could also be a loose screw or a loose bracket on the engine.

Best regards, Rainer.

...or a clanging metal sheet, or something like that...