![]() |
|
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. |
|
![]() |
telank |
![]()
Post
#1
|
Newbie ![]() Group: Members Posts: 8 Joined: 23-August 15 From: Indiana Member No.: 19,091 Region Association: Upper MidWest ![]() |
I'm in need of ideas to resolve an idle speed dilemma. My 914 is a 1975 1.8L which I bought about a year ago. It seems to be very stock and still has the L Jetronic FI system in place. Here is the challenge.... I have been using the process in the Haynes manual for setting idle speed. If I set the speed when the car is warm, the next time t is started cold it is difficult to start and will idle so slow it barely stays running. Once warmed up all is good. If I set the idle speed right after starting before it is up to temperature - after it does warm up - it will be idling at over 2,000 RPM. Outside of this issue the car runs good and strong. The plugs are perfect color - so no indication of too lean or rich mixture. Thanks for your thoughts or ideas!
|
![]() ![]() |
TheCabinetmaker |
![]()
Post
#2
|
I drive my car everyday ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 8,304 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 ![]() |
Will this type of valve provide more, or less air volume?
|
telank |
![]()
Post
#3
|
Newbie ![]() Group: Members Posts: 8 Joined: 23-August 15 From: Indiana Member No.: 19,091 Region Association: Upper MidWest ![]() |
Will this type of valve provide more, or less air volume? What I think I've learned through the process of sorting this problem is...... At least a couple versions of these auxiliary air valves were used on 914's through the years. All valves were open when cold to provide extra air into the engine during warm-up. As the engine warmed the valve closes. If the valve is working properly the bimetallic coil or strip inside the valve is heated by a heating element and that closes the valve. If the valve is not functioning properly for some reason, or stuck open or closed you are not getting the proper amount of air. The problem may be most noticeable at start up or when warm - depending on how one has adjusted the idle speed screw. In my situation the valve was stuck closed so the engine would barely idle and run when cold. Once warmed up all was good and the engine idled smoothly. If I adjusted the idle screw so that it idled properly at cold start up the idle speed would rise to ~ 2,000 RPM when warm because I had opened the throttle excessively to allow the engine to idle when cold to compensate for the non-functioning AAR. There are folks who know much more about this than do I. So if I've misstated something hopefully they will jump in and correct any confusion I may have created! |
![]() ![]() |
![]() |
Lo-Fi Version | Time is now: 10th June 2024 - 07:30 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 ... |