![]() |
|
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. |
|
![]() |
jmargush |
![]()
Post
#1
|
Member ![]() ![]() Group: Members Posts: 463 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 ![]() |
I am having trouble getting my new 2056 with a 9590 cam to idle. When I start it is idles around 500rpm or lower and I can't speed it up with the by pass screw.
I am running L-jet injection I hear a hissing sound when the engine is idling but I cannot find a vacuum leak, plenum couplers are new and all other hoses are in good shape. I can't find the hissing with a mechanics stethoscope so I was going to try to find a leak with propane but it has been too cold to work on it lately. The idle does seem to get a little better after it has warmed up a bit I think, it has been several weeks since I have had it out. One question I had is does the new cam require any change to the mixture? if so how do I go about adjusting the mixture? Thanks in advance for any input |
![]() ![]() |
jmargush |
![]()
Post
#2
|
Member ![]() ![]() Group: Members Posts: 463 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 ![]() |
Ok I went back and set the timing at full advance 28 degrees BTDC
I am still fighting the idle. When first started it idles low As it warms up it rises to 800 rpm Once it is reved it idles at 1800 rpm If I turn the bypass screw in I can lower it but as soon as I rev the engine it climbs back to 1800 rpm If I try to pull it down by placing a load on the engine it will drop but as soon as the load is gone it climbs right back up. Acts as if the vacuum retard isn't working. I checked the diaphragm and it was good. Idle mixture @ 800 rpm is 19.6 - 20.7 when it idles at 1800 rpm mixture is 13.1-14 any more ideas of what to look for? |
![]() ![]() |
![]() |
Lo-Fi Version | Time is now: 26th June 2024 - 11:06 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 ... |