 Got her running..., 4000 RPM idle speed!!!! |
|
|
|
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. |
|
|
| bpetry |
 Dec 3 2007, 09:58 PM
Post
#1
|
|
Newbie  Group: Members Posts: 8 Joined: 12-November 07 From: Springboro, OH Member No.: 8,324  |
OK, so I just got my '72 1.7 EFI running for the first time. Replaced all the vacuum and fuel lines and I thought everything was hooked up corectly per the pelican tech diagrams but after she fires up she idles for a few seconds and then zips right up to 4000 RPM (with no muffler I'm sure the neighbors loved that!). The throttle plate is almost all the way closed so it must be sucking air from somewhere else. I pinched off the big hose that goes from the plenum up near the oil fill and that seemed to slow it down a little, but I don't like letting it rev that high, especially when it hasn't been run in so long so I shut her off and figured I'd come in and ask the experts, any ideas? Regards, Brian Petry, Springboro, OH |
   |
 
|
  |
Replies
| Dave_Darling |
Dec 4 2007, 02:38 AM
Post
#2
|
|
914 Idiot Group: Members Posts: 15,196 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
|
You have a large air leak. Most likely you have a hose going straight from something "upstream" of the throttle (like the air cleaner, or the rubber hose from the air cleaner to the throttle), to "downstream" of the throttle body (like the manifold). There should never be any hoses that go directly from the one to the other, without having some "component" in the middle.
--DD |
|
|
|
Posts in this topic
bpetry Got her running... Dec 3 2007, 09:58 PM
jimkelly first get a muffler on it : )
maybe disconnect co... Dec 3 2007, 10:11 PM brp986s I disagree with altering the ecu mixture and cold ... Dec 3 2007, 10:46 PM McMark The throttle would have to be significantly open t... Dec 3 2007, 11:28 PM nola914 There's a bunch of possibilities. Sounds like... Dec 3 2007, 11:32 PM BiG bOgGs Just recently I got my engine fired again, also af... Dec 4 2007, 06:15 AM bpetry Thanks for all the replies. I've got a bunch ... Dec 4 2007, 06:46 AM army dude Its not supposed to idle that high?
Ian Dec 4 2007, 02:14 PM swl I agree with all the air leak guys. It is going to... Dec 4 2007, 07:27 PM
bpetry Yep it was the AAR hose to the intake. I plugged ... Dec 4 2007, 11:25 PM ConeDodger Mark asked me to take a picture of it and I will g... Dec 4 2007, 11:40 PM McMark Bring it with you Saturday Rob. We'll show it... Dec 5 2007, 12:17 AM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 4th July 2025 - 10:41 AM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.