348SStb

Every single non-GT Porsche 4.0 car (718) and 992 car (3.0 and 3.8 turbo model) has these annoying injectors which make the terrible sound. Your car has it too, even if it doesn’t bother you.

I don’t have the energy to review this entire thread — do you have a link to, copy of, or a further explanation of that bulletin?

Edit: I found the bulletin.
And if your car has a fix from the factory, that’s great!

Airbag997

This^^ The DI fuel pump is making all the noise. DI engine fuel pumps run off the camshaft (typically) and are relatively "noisy" with the constant solenoid actuation. Piezoelectric injectors are near silent, much quieter than solenoid injectors.

h_4711

I tell you again : After 10.000 miles the initially dominating ticking of my GTS 4.0 at idle speed has completely vanished - that's not in my imagination, I use to record and analyze the engine sound by scientific technical methods - see attached file in #151 of this thread for example.
So, is there anybody, who can tell me why annoying noises from a high pressure fuel pump should disappear after some hundred hours of operation ?

I agree with Airbag997, that piezo injectors must be excluded as a reason of ticking. Their sound periodicity at idle speed is 35 ticks/second (much more than the ticking periodicity) at a frequency of about 17,5 kHz (not hearable for most adults).

By exclusion of these reasons a (initially) sticking hydraulic lifter remains, which has become more and more free after some thousand miles of operating in my car.
Ticking of many GTS 4.0 engines is reported, but not of all. None of the cars tested by the motor press ticks and there is no ticking in Porsches sound example for this car.

Anyway, there is no hint that ticking does affect engines lifetime. I didn't find any report of severe engine damages worldwide. Investigation of metal wear in the oil filter of my car was negative.
It seems, that valve system does withstand increased clearances without any problems.

sonicworld

As I was driving my new CGTS 4.0 home from the dealership last November, with the window down I noticed the ticking on the highway. I only heard it when pressing on the accelerator, when I lifted off the accelerator it would stop. And the faster I revved the engine, the faster the ticking would occur. As the car has been in winter storage will be curious to see if the issue changes as time goes by.

TXshaggy

The 718 non-RS 4.0 engines are unique; from the press release"

"For the first time ever, piezo injectors are used for direct fuel injection in a high-revving naturally aspirated engine. They split each injection process into up to five individual injections. This contributes to a particularly thorough combustion process. A variable intake system with two resonance valves ensures optimum gas exchange in the cylinders."

Accompanying these new injectors is a new high/low pressure fuel rail/solenoid system that's at the heart of some of the racket reported.

348SStb

Yup. Injectors, injection system, some esoteric components, whatever.

I first noticed this back in 2020 and nobody at the dealer knew what this was and everyone thought I was crazy. It’s downright annoying and the car sounds like a diesel engine at idle. I’m glad Porsche has finally acknowledged the problem after a long period of denial. With that being said, it looks from that Internal Porsche Document that fixing this at the dealer level would involve very invasive maneuvering, and I don’t think I’d trust a dealer to do this.

GTSPYDER23

completely agree. Never noticed it. Love the car too much anyway….

ubzer

It doesn't bother me at all. It's an engine developed for GTs with a lot of displacement. Even mechanical noises are welcome here.
Also according to the development department in Weissach

Westcoast

Hmmm, interesting take on this, can you share this 'Porsche' document that states this actually a problem that requires a repair action? I have yet to see or read anything official that says these engine noises are anything other than what is expected of this configuration.

Without corroborating documentation, you appear to be guessing. EDIT *** OK, I have been provided the TSB, it appears to be one of those actions that are predicated on a customer complaint. ***

sonicworld

I've seen it too, I believe it was posted earlier in this thread. Although, to be fair, no where does it state it necessitates any action. But does list actions that can be taken, in increasing complexity, should the customer complain.

mikedee

Why are we gatekeeping this TSB ?

UncleDude

I think this is it.

justince

Has anybody waived this TSB at their dealer and attempted this "fix"?

perfe.gt4

I had the car at the dealer's for the first 2-year service and they said the warranty does not cover any noises. I didn't mention the injector ticking some owners discuss here, but I did mention a random chirping noise I often hear.
As long everything works, they don't pay a great deal of attention.

But interestingly enough, they charged for additional work (0342) for water drainage. Allegedly, Porsche warned them to start checking this to avoid potential problems later. Anyone else got that on their invoice?

subwoofer

The loud chirping/rattling sound is really off-putting to me. I really disliked it with the OEM exhaust. I now have a loud aftermarket rear box which (thankfully) drowns out that annoying chirping sound. I guess the only way to deal with it is to drown it out with a loud exhaust.