How does a faulty flexible pipe manifest itself?

Hi,

"After my car had a new timing chain installed, I've noticed a duller engine noise after about 1,000 km. When I drive into the underground parking garage with the window open, it sometimes sounds like something is blowing out of the exhaust." However, there is no hissing sound audible, rather a deep, muffled hum.

Could a defective flexible pipe become noticeable in some way?
That must have taken quite a beating due to the raising and lowering of the engine...

Hi,

I only hear a hissing sound when accelerating strongly, which I suspect is due to a faulty flexible pipe.
I've only ever heard that dull rumbling sound from tension in the exhaust system.
I have quite a bit of experience with both, as I'm driving a "prototype" myself.

Regards,
dieter

My (two 1Z engines and one ASV engine) always started with a rough idle.

Especially at the beginning, there's a characteristic engine speed (usually only at certain loads) where it makes a lot of noise.

The APE (gasoline-powered model) that is being welded today sounded like it had a sports exhaust.

Diesel engines often make a noticeable rumbling sound, even when idling, that can be heard from below. If you press the "Kat" button, the buzzing sound stops.

m;

Hello,

Additionally, there's a slight exhaust smell, as the interior fan is located nearby.

I certainly noticed that myself, back then!

Best regards, Ferdi.

Ferdi wrote:

Hello, Additionally, there's a slight exhaust smell, as the interior fan is located nearby. I certainly noticed that myself, back then! Best regards, Ferdi

Hi,

That gives me particular cause for concern, because I always have problems with my eyes wanting to close on a specific section of the highway. Will you definitely smell it, for example, under full load?

If the hood seal is properly installed, you won't smell anything.
And if that were the case, you would hardly experience carbon monoxide poisoning with a diesel engine .

I also don't understand how exhaust fumes could possibly enter the passenger compartment of a Golf 4 TDI if the flex pipe is broken.

First of all, I consider a flexible pipe to be broken even when it is still completely sealed.
The problem is that the system first becomes mechanically unstable, and then the exhaust system starts to resonate. Long after the initial defect begins, it can continue to worsen and release exhaust gases.

My three defective Flex hoses on the 1Z were all perfectly verschandeln on the outside... and the 1Z is already producing a noticeable amount of soot.

At most, you might smell something near the traffic light, but it's impossible to tell whether the smell is coming from the exhaust pipe or if it's just being drawn forward from somewhere else.

The fact that even a flexible exhaust pipe – especially on a highway – shouldn't produce any smell while driving can be seen at the installation point: The gases will flow along the angled splash guard, parallel to the exhaust pipe, and there should be no opening leading to the interior of the vehicle; otherwise, you would have completely different problems.

Greetings.
Martin.

P.S.: Please search for "Flexrohr" in this forum... I think I know something about it .

Thank you for your contributions.

I can now check it on stage while the engine is running, and it's really airtight.
I still don't know why the engine is making a louder noise than usual at the moment.

As I said, "dicht" and "dröhn" are not directly related.

Did you perhaps get gas somewhere else?

My Trekker is definitely quieter with the Ultimate Soup (the G3 always sounded the same).

m;

No.

basically, like most of Jet's products.

I suspect it's related to the slightly different mounting position of the right engine mount. Immediately after the timing belt replacement, when it was colder than it is now, it was actually less noisy than it was before. But now, with a slightly higher temperature, the situation seems less favorable.

Or maybe I'm just crazy, and I'm a little off track right now because of a few problems .