Diagnosing an intermittent D-Jet problem..., Hesitation under load at 2800 RPM but only when cold... |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Diagnosing an intermittent D-Jet problem..., Hesitation under load at 2800 RPM but only when cold... |
MikeInMunich |
Oct 10 2016, 02:46 AM
Post
#1
|
Member Group: Members Posts: 392 Joined: 19-November 13 From: Munich, Germany Member No.: 16,674 Region Association: None |
Hi again from Munich!
Here are the details. But please see update from Feb. 5th below! I have a D-Jetronic intake. Under load and at about 2800 RPM Im experiencing an intermittent hesitation. Yesterday my son and I took the car out for a drive from Munich, towards Innsbruck and back and we ran into a bit of rain coming along the Aachensee (lake), and this hesitation got worse. Then I remembered the only other time I've had this car out with 100% humidity and that it wasn't running well on that day either, so this is apparently a clue. So what can this be? And why does it happen at all, even when it's not raining, albeit not as noticeably? Is there a cure? Experts / senior gurus out there, thank you for your time and sharing your knowledge and experience, in advance! With kind regards, Mike in Munich (IMG:style_emoticons/default/smilie_flagge6.gif) |
914_teener |
Feb 14 2017, 02:38 PM
Post
#2
|
914 Guru Group: Members Posts: 5,200 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
So did you do everything Brad noted?
I would suggest methodical checklist approach.. |
MikeInMunich |
Feb 14 2017, 03:28 PM
Post
#3
|
Member Group: Members Posts: 392 Joined: 19-November 13 From: Munich, Germany Member No.: 16,674 Region Association: None |
So did you do everything Brad noted? I would suggest methodical checklist approach.. That was awesome of Brad to take the time to type up such a long list, and yes, most, though not all of those things were checked. It was quite exaustive. I'm pretty sure that it's either the TPS or a bad connection, likely at the CHTS. Just wondering right now if anyone has a clue as to why the symptom would stop when the car is fully warm. Thanks, M.i.M. |
914_teener |
Feb 14 2017, 04:01 PM
Post
#4
|
914 Guru Group: Members Posts: 5,200 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
So did you do everything Brad noted? I would suggest methodical checklist approach.. That was awesome of Brad to take the time to type up such a long list, and yes, most, though not all of those things were checked. It was quite exaustive. I'm pretty sure that it's either the TPS or a bad connection, likely at the CHTS. Just wondering right now if anyone has a clue as to why the symptom would stop when the car is fully warm. Thanks, M.i.M. If you have checked everything he posted........it should run fine. Two things....if it is an electeical problem the symptom may be stopping because the connection heats up and the intermittent connection is no longer intermitent. Meaning copper commections have high coefficents of expansion and make better contact. If it is fuel then....same thing....fuel atomizes better in warm air. Have you tried upping the fuel pressure to 32 psi instead of 29? |
Lo-Fi Version | Time is now: 27th May 2024 - 08:50 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |