 The Dreaded Idle Mystery, Idle Me This |
|
|
|
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. |
|
|
| Apexster |
 Jan 2 2020, 03:05 PM
Post
#1
|
|
Newbie  Group: Members Posts: 8 Joined: 1-June 18 From: Concord, CA Member No.: 22,180 Region Association: Northern California  |
Looking for a little insight on the dreaded idle mysteries of a 1974 2.0 914. I've searched the archives for a couple months and tried just about everything.
Valves freshly adjusted. Compression is above 135psi and within 2% on all cylinders. Original D-jet intact with new hoses and all components tested and working. Fuel pressure tested (30-31psi from original 3 hose fuel pump). New plug wires, newly rebuilt distributor, recent fuel filter. I'm about to replace the 20 year old CHT sensor as well. The car revs smoothly and pulls very strong. Engine runs great anywhere above 1200 rpm. Problem is 3 or so minutes after a cold start it drops off the high idle and transitions to a rough idle, like it's running on three cylinders. When I spray carb cleaner in the air cleaner the idle smooths out immediately. Has anyone else come across this issue and perhaps suggest a plan of action to resolve it? (IMG:style_emoticons/default/confused24.gif) Thanks and Happy New Year to All. |
   |
 
|
Posts in this topic
Apexster The Dreaded Idle Mystery Jan 2 2020, 03:05 PM
Tdskip AAR? Jan 2 2020, 03:35 PM GregAmy Does it ever smooth out after warm-up? If so, coul... Jan 2 2020, 03:48 PM
Apexster
Does it ever smooth out after warm-up? If so, cou... Jan 2 2020, 07:53 PM Olympic 914 :agree:
Sounds like you could use one of Brads C... Jan 2 2020, 03:59 PM JawjaPorsche
:agree:
Sounds like you could use one of Brads ... Jan 2 2020, 04:34 PM Not_A_Six
:agree:
Sounds like you could use one of Brads... Jan 2 2020, 06:51 PM Apexster
[quote name='JawjaPorsche' post='2774198' date='J... Jan 2 2020, 08:05 PM GregAmy About a year ago the car developed a bit of warm i... Jan 3 2020, 05:58 AM Rand I appreciate Brad as much as we all do.
Spacers t... Jan 2 2020, 07:06 PM rjames
I appreciate Brad as much as we all do.
Spacers ... Jan 3 2020, 12:57 AM Apexster
I appreciate Brad as much as we all do.
Spacers... Jan 3 2020, 08:24 PM porschetub
I appreciate Brad as much as we all do.
Spacers ... Jan 5 2020, 04:03 PM porschetub [quote name='Apexster' date='Jan 3 202... Jan 2 2020, 08:13 PM rjames
Just re-read the above from your first post- Doe... Jan 3 2020, 01:06 AM rjames If the MPS has been rebuilt you absolutely need to... Jan 4 2020, 04:26 AM Apexster
If the MPS has been rebuilt you absolutely need t... Jan 4 2020, 12:18 PM rjames
[quote name='rjames' post='2774549' date='Jan 4 2... Jan 4 2020, 04:11 PM Apexster
[quote name='rjames' post='2774549' date='Jan 4 ... Jan 5 2020, 12:23 PM JawjaPorsche I replaced my injection wiring harness with a new ... Jan 4 2020, 06:45 AM Bleyseng Did you adjust the idle mixture after the engine w... Jan 4 2020, 12:57 PM JeffBowlsby The MPS is the primary fuel injection sensor to de... Jan 5 2020, 12:53 PM Apexster
The MPS is the primary fuel injection sensor to d... Jan 5 2020, 08:14 PM Bleyseng Vacuum is what controls the MPS so if you have any... Jan 5 2020, 01:55 PM Bucci I sent out the factory ECU brain and had all the c... Jan 9 2020, 08:19 PM Robson51
I sent out the factory ECU brain and had all the ... Jan 9 2020, 08:31 PM  |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 16th May 2024 - 09:38 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.