 Possible decel valve problem, Idle likes to drop to zero after warmed up. |
|
|
|
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. |
|
|
| boxsterfan |
 Oct 9 2013, 02:20 PM
Post
#1
|
|
914's are kewl  Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California  |
1974 2.0L D-Jet
Once the engine gets warmed up, my engine RPM likes to drop down to zero when letting off the gas. This is not just a "gauge" bouncing issue but rather you can feel that the motor has dropped to zero (stalling). Does this sound like a condition that can occur because of a faulty decel valve? Anyone in San Ramon, CA have a known working spare one i could test with? Part#: U039133551 Referred to affectionately as a decel valve, this factory installed device lets the idle down slowly to more effectively limit the unburned gas exiting the tail pipe and keep the engine from stalling. mounts on the right side of the firewall just above the pressure sensor and just behind the battery and three vacuum lines attach to it. |
   |
 
|
Posts in this topic
Java2570 I think typically the decel valve starts leaking a... Oct 9 2013, 02:28 PM Java2570 I'd look at fuel pressure, possible fuel deliv... Oct 9 2013, 02:41 PM The Cabinetmaker I agree. Remove the hoses and plug them. Take the ... Oct 9 2013, 03:38 PM 76-914 What's your idle rpm when it's cold and be... Oct 9 2013, 03:42 PM
boxsterfan
What's your idle rpm when it's cold and b... Oct 9 2013, 11:45 PM r_towle Remove and plug the AAR, decel! and all other ... Oct 9 2013, 09:09 PM boxsterfan Thanks everyone. I will troubleshoot this weekend.... Oct 9 2013, 10:46 PM Philip W.
Remove and plug the AAR, decel! and all other... Oct 10 2013, 08:30 AM boxsterfan
Remove and plug the AAR, decel! and all othe... Oct 10 2013, 10:13 AM worn
How do you adjust the MPS? I know this part is ... Oct 10 2013, 11:33 AM Philip W.
How do you adjust the MPS? I know this part is... Oct 10 2013, 12:29 PM worn
I guess i like to tinker with these things, and... Oct 10 2013, 01:21 PM Philip W.
I guess i like to tinker with these things, an... Oct 10 2013, 06:45 PM 76-914 :agree: Oct 10 2013, 09:04 AM rick 918-S I just fired up a rebuilt 2.0 I took it for a driv... Oct 10 2013, 07:05 PM r_towle
I just fired up a rebuilt 2.0 I took it for a dri... Oct 10 2013, 08:14 PM boxsterfan
I just fired up a rebuilt 2.0 I took it for a dri... Oct 10 2013, 09:17 PM  |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 2nd April 2026 - 09:50 AM |
Invision Power Board
v9.1.4 © 2026 IPS, Inc.