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) |
BeatNavy |
Oct 11 2016, 11:11 AM
Post
#2
|
Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
There's a hole in the engine tin next where the #3 spark plug wire goes. There's a one wire lead coming out of it. That lead is part of the CHT, although you probably can't see the sensor itself (as it's under the tin). You need a deepwell 13mm socket to get it out, and you have to bunch up the lead inside the socket.
The CHT has a profound impact on mixture to the point that if the circuit is open the engine won't start or will die almost immediately (and won't start again until cold). I can see the "bucking" thing being possible with a sketchy CHT connection, but I'm also a fan of what I think are more likely suspects, like FI grounds, ignition connections, etc., etc. |
Lo-Fi Version | Time is now: 9th June 2024 - 09:44 PM |
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 ... |