![]() |
|
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. |
|
![]() |
JDW914 |
![]()
Post
#1
|
Newbie ![]() Group: Members Posts: 25 Joined: 27-April 11 From: Toledo, Ohio Member No.: 12,990 Region Association: Upper MidWest ![]() |
I'm not sure what's going on here, but I'm hoping somebody here will.
I've been driving my car ('74 2.0 all original engine and FI) for a few years now, I did some tuning last summer, and it's been running great since. But, having it out only once a week at most, this winter the battery had started to show signs of wearing out - the car was getting hard to start and often needed charging - so last week I bought a new battery and installed it. Initially, this seemed to work great: I turned the key, the car started immediately, and it idled perfectly at 1200rpm. However, as soon as I touched the gas, the engine revved to 3000 and stayed there for about 20 seconds. Upon experimentation, it seemed that the engine would retain both power and speed of any throttle position for a ~20s period after the throttle was returned to idle. I was able to alleviate this to some extent by turning the idle-mixture adjustment to maximum and opening the idle bypass by 5 turns, but it still acts weird. When I set the idle mixture to do anything besides flood the rpm down, the engine stays at 1500 rpm even with the idle bypass closed all the way and the AAV closed off. My instinct is that it's a vacuum leak, but there's not a whistle to be hard or lose hose to be seen. Could it be (I hope not) something to do with the FI system? |
![]() ![]() |
Mike Bellis |
![]()
Post
#2
|
Resident Electrician ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None ![]() ![]() ![]() |
Changed your battery and this happened?
I bet your ground connection is bad and the engine is seeking earth through your throttle cable in the tunnel. micro welding the cable to the tube in the tunnel. Try to completely disconnect the ground cable from the car and clean the stud on the firewall and reconnect. |
![]() ![]() |
![]() |
Lo-Fi Version | Time is now: 17th June 2024 - 08:09 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 ... |