Hesitation at low revs + noisy tappet - Page 2 - 6SpeedOnline

Sep 15, 2009 | 03:46 PM

#16

movingup

Registered User

Joined: Mar 2008

Posts: 70

From: san francisco

Rep Power: 21

still dont like it

Mar 4, 2013 | 11:43 PM

#17

arthurk

Registered User

Joined: Jan 2004

Posts: 181

From: Melbourne, Australia

Rep Power: 34

Quote:

Originally Posted by Bonerwall

I am told that "tappet noise" is really the DFI engine's high pressure fuel being injected into the cylinder-head (unique to the new DFI engines).

+1

I took mine in thinking it was an issue and was told the same thing. He basically said it is not a mechanical noise and its the high pressure injectors. I was there for another reason and mentioned it to them at the same time.

Mar 5, 2013 | 10:07 AM

#18

tiyyara

Registered User

Joined: Jan 2012

Posts: 380

From: Indiana

Rep Power: 30

Quote:

Originally Posted by Alan

7200 miles on my 997.2 C2S. When the engine is initially cold, there is a definite hesitation. I've "fixed" the problem by waiting 20 secs of so and (maybe) let the high pressure fuel pump stabilize - seems to help. The car sounds like a little like a diesel on start up - not a pretty sound coming from the DFI. Everything smooths out at operating temperature

I have the exact same thing. 1/2 hesitation in the morning or when engine real cold after being parked for long time.
Had it to dealer, they kept it several days and compared it to 2 other cars with same engine and same year and ran it by Porsche NA help tech line or whatever it is called.
Exactly due to the "overrun-richness" of DFI engines.
Resolves within 30-60 seconds and runs like a devil.
No fault codes, no errors, no check engine lights

Apr 20, 2017 | 05:41 AM

#19

f911

Registered User

Joined: Mar 2017

Posts: 7

Rep Power: 0

Hi

I have the exact same thing.
The main hesitation in the morning. Around 2000RPM.

No fault codes, no errors, no check engine lights

My car: 911 997.1 2005 tiptronic s carrera s (Chrono Sport) 150KM.

This happens mainly in Gear #2.

It does not matter if I'm in D or M mode or "Sport mode"...

My mechanic also told me it looked normal. These engines "like" high rpm ..