 Djet question, idle adj. screw |
|
|
|
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. |
|
|
  |
| Java2570 |
 Jul 21 2011, 07:18 AM
Post
#1
|
|
Senior Member  Group: Members Posts: 649 Joined: 7-May 11 From: Fishers, IN Member No.: 13,035 Region Association: Upper MidWest  |
I have a 74 2.0L with stock Djet EFI and have a question Re: idle adjustment screw.
Is it normal or abnormal to hear the air slightly hissing when you increase the idle adjustment screw? It seems to become noticeably louder when I have it at about halfway out. It does seem to adjust the idle but it isn't super sensitive like I've read it should be; could I have a leak in the plenum or elsewhere? I have replaced all of my vacuum hoses and feel pretty good about them not leaking in general....however, I'm unsure about the intake plenum and throttle body gasket. I don't seem to have any real problems with high idle or idle hunting but was concerned about the idle screw hissing a bit. Thanks for the help!! |
   |
 
|
| 76-914 |
Jul 21 2011, 07:48 AM
Post
#2
|
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,502 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
|
QUOTE(Java2570 @ Jul 21 2011, 06:18 AM)  I have a 74 2.0L with stock Djet EFI and have a question Re: idle adjustment screw. Is it normal or abnormal to hear the air slightly hissing when you increase the idle adjustment screw? It seems to become noticeably louder when I have it at about halfway out. It does seem to adjust the idle but it isn't super sensitive like I've read it should be; could I have a leak in the plenum or elsewhere? I have replaced all of my vacuum hoses and feel pretty good about them not leaking in general....however, I'm unsure about the intake plenum and throttle body gasket. I don't seem to have any real problems with high idle or idle hunting but was concerned about the idle screw hissing a bit. Thanks for the help!! Normal |
|
|
|
| kkid |
Jul 21 2011, 09:54 AM
Post
#3
|
|
Member Group: Members Posts: 343 Joined: 18-December 07 From: Oakland, CA Member No.: 8,483 Region Association: Northern California |
QUOTE(76-914 @ Jul 21 2011, 06:48 AM) QUOTE(Java2570 @ Jul 21 2011, 06:18 AM) I have a 74 2.0L with stock Djet EFI and have a question Re: idle adjustment screw. Is it normal or abnormal to hear the air slightly hissing when you increase the idle adjustment screw? It seems to become noticeably louder when I have it at about halfway out. It does seem to adjust the idle but it isn't super sensitive like I've read it should be; could I have a leak in the plenum or elsewhere? I have replaced all of my vacuum hoses and feel pretty good about them not leaking in general....however, I'm unsure about the intake plenum and throttle body gasket. I don't seem to have any real problems with high idle or idle hunting but was concerned about the idle screw hissing a bit. Thanks for the help!! Normal (IMG:style_emoticons/default/agree.gif) your ears are normal (IMG:style_emoticons/default/biggrin.gif) |
 |
|
| Java2570 |
Jul 21 2011, 10:08 AM
Post
#4
|
|
Senior Member Group: Members Posts: 649 Joined: 7-May 11 From: Fishers, IN Member No.: 13,035 Region Association: Upper MidWest |
QUOTE(kkid @ Jul 21 2011, 11:54 AM) QUOTE(76-914 @ Jul 21 2011, 06:48 AM) QUOTE(Java2570 @ Jul 21 2011, 06:18 AM) I have a 74 2.0L with stock Djet EFI and have a question Re: idle adjustment screw. Is it normal or abnormal to hear the air slightly hissing when you increase the idle adjustment screw? It seems to become noticeably louder when I have it at about halfway out. It does seem to adjust the idle but it isn't super sensitive like I've read it should be; could I have a leak in the plenum or elsewhere? I have replaced all of my vacuum hoses and feel pretty good about them not leaking in general....however, I'm unsure about the intake plenum and throttle body gasket. I don't seem to have any real problems with high idle or idle hunting but was concerned about the idle screw hissing a bit. Thanks for the help!! Normal (IMG:style_emoticons/default/agree.gif) your ears are normal (IMG:style_emoticons/default/biggrin.gif) OK, thanks guys!! That makes me feel better! |
|
|
|
| r_towle |
Jul 21 2011, 10:18 AM
Post
#5
|
|
Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
|
Its an Idle Air Bypass screw.
The more its open, the more air flows past the screw. the screw is shaped like a cone, so the air will hiss going past it. rich |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 17th May 2024 - 06:30 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.