 D-jet troubleshooting, Only one item left on my list! |
|
|
|
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. |
|
|
| saigon71 |
 Mar 16 2014, 04:06 PM
Post
#1
|
|
Advanced Member  Group: Members Posts: 2,014 Joined: 1-June 09 From: Dillsburg, PA Member No.: 10,428 Region Association: MidAtlantic Region 
 |
My 1974 2.0 D-jet is running very strong, but there were two lingering issues with the FI that I wanted to address over the winter:
1. A severe idle "hunt." The engine would rush up to about 1200 RPM, then nearly stall...repeat cycle. 2. Every once in a while the car would buck, most notably at highway speeds...it wasn't bad, just annoying. Last week I installed a new circuit board in the TPS purchased from Dave Sprinkle a few years back. It was calibrated according to the Pelican tech article using an ohmmeter. I took a 210 mile road trip over the weekend to test things out. The car now idles perfectly through the entire warm-up sequence. Thanks Dave! (IMG:style_emoticons/default/beerchug.gif) The problem is that I still have the same bucking issue. All my research points to the TPS. Any suggestions on what to check next? |
   |
 
|
  |
Replies
| watsonrx13 |
May 11 2014, 08:08 AM
Post
#2
|
|
Advanced Member Group: Members Posts: 2,735 Joined: 18-February 03 From: Plant City, FL Member No.: 312 Region Association: South East States |
Thanks for everyone's suggestions. I have pulled the distributor and removed the vacuum advance. I visually checked the arm and it looks clean. I also manually was able to move it. I hooked up a vacuum gauge to the advance port and nothing moved nor did it hold vacuum. I hooked up to the retard port and was able to get vacuum and movement.
At this point I'm assuming the advance side isn't working and I've placed an ad for a2.0l vacuum advance. Once I've replaced the vacuum advance I'll reinstall the distributor, hook up the vacuum hose and test the car again. Also someone commented about the vacuum hose not routed correctly, I've included a photo of where the hose is connected to the plenum. Stay tuned for more updates. Vacuum advance, advance side where arm comes out.  Distributor (039 905 205A) with vacuum advance removed. The advance is removed by removing the circlip from the distributor and (2) screws.  Distributor removed. The distributor is easily removed by removing the wires to the FI trigger and coil and unbolting the mounting nut and washer. Do NOT loosen the locking arm.  Location of the vacuum advance hose on the plenum.  --- Rob |
|
|
|
Posts in this topic
saigon71 D-jet troubleshooting Mar 16 2014, 04:06 PM
914_teener Fuel pressure. Mar 16 2014, 04:36 PM mepstein I had a bucking issue. sometimes bad, sometimes no... Mar 16 2014, 06:27 PM boxsterfan My car has the "idle hunt" problem on wa... Mar 16 2014, 09:17 PM
saigon71
My car has the "idle hunt" problem on w... Mar 17 2014, 06:24 AM watsonrx13 I have a '74 2.0 D-jet also. My runs very well... Mar 17 2014, 06:04 AM Philip W.
I have a '74 2.0 D-jet also. My runs very wel... Mar 17 2014, 06:25 AM brant
[quote name='watsonrx13' post='2011990' date='Mar... Mar 17 2014, 03:22 PM larss
To both of you who richened the mixture by enri... Mar 17 2014, 11:16 PM Philip W. I have a new wide band installed and will be testi... Mar 18 2014, 08:15 PM larss
My 1974 2.0 D-jet is running very strong, but the... Mar 17 2014, 06:32 AM Philip W.
My 1974 2.0 D-jet is running very strong, but th... Mar 17 2014, 08:05 AM r_towle
My 1974 2.0 D-jet is running very strong, but the... Mar 17 2014, 10:40 AM plas76targa Bob,
i get the same bucking issues. It's usual... Mar 17 2014, 11:36 AM jsayre914 Bob,
I fixed this issue by removing the trigger p... Mar 17 2014, 01:58 PM davesprinkle The interdigitated traces (love that word, I found... Mar 18 2014, 07:44 PM saigon71
The interdigitated traces (love that word, I foun... Mar 19 2014, 07:28 PM watsonrx13 Thanks for all of the suggestions. I'm going t... Mar 20 2014, 06:51 PM watsonrx13 I finally purchased and installed a new Bosch ... Apr 21 2014, 06:46 AM 914itis Bob,
Some may remember my long thread after insta... Apr 21 2014, 12:46 PM 914_teener
Bob,
Some may remember my long thread after inst... Apr 21 2014, 07:32 PM zymurgist Wow, good info in the linked thread. Mine is doin... Apr 21 2014, 08:49 PM luskesq Timing (and it wasn't off by much) caused my i... Apr 21 2014, 09:08 PM watsonrx13 Well finally had a chance to check the vacuum adva... May 10 2014, 10:39 AM r_towle The distributor has never been cleaned...well it... May 10 2014, 10:45 AM watsonrx13
The distributor has never been cleaned...well it... May 10 2014, 12:14 PM type47 I checked the vacuum advance on a distributor on a... May 10 2014, 10:51 AM r_towle
I checked the vacuum advance on a distributor on ... May 10 2014, 10:52 AM type47
I checked the vacuum advance on a distributor on... May 10 2014, 04:06 PM The Cabinetmaker One port is advance, the other is retard. May 10 2014, 12:19 PM boxsterfan I think your vacuum line (as pictured) is hooked u... May 10 2014, 02:08 PM r_towle Yup, one is advance, one is retard.
Retard was lef... May 10 2014, 02:12 PM watsonrx13 Rich thanks for the reply, that explains everythin... May 10 2014, 03:46 PM The Cabinetmaker Where does the hose with the clamp go to? It's... May 10 2014, 04:06 PM 914_teener I really think you should yank that dizzy out and ... May 10 2014, 11:06 PM r_towle Remove the other two screws and pull out the actua... May 11 2014, 08:51 AM watsonrx13 Rich, which (2) screws are you talking about remov... May 11 2014, 09:19 AM watsonrx13 OK, I reread your reply and did the following
1. ... May 11 2014, 09:44 AM Dtjaden Carb or brake cleaner would work well. The RS clea... May 11 2014, 10:08 AM watsonrx13 Cleaned parts. BTW, I added a small amount of grea... May 11 2014, 10:23 AM watsonrx13 Successful test drive. The engine idles great and ... May 11 2014, 10:52 AM r_towle Was at moms today.
You found it....
I use whateve... May 11 2014, 04:01 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 11th May 2025 - 09:20 AM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.