 Decel valve, high idle=faulty valve? |
|
|
|
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. |
|
|
  |
| brownaar |
 Oct 13 2006, 05:34 PM
Post
#1
|
|
Member  Group: Members Posts: 263 Joined: 23-September 04 From: Gate City, VA Member No.: 2,813 Region Association: None  |
Noticed recent problem with high idle after warm-up. Checked throttle, it was closing completely. Two other suspects high on the list were AAR and decel valve. Clamped hose from decel valve to plenum, idle dropped to normal, AHA culprit found. Anybody else have any problems like this? Is this indicative of a bad valve? I know most people have done away with the decel valve and plugged the lines.
Thanks |
   |
 
|
| McMark |
Oct 13 2006, 05:49 PM
Post
#2
|
|
914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
With the car off, you should not be able to blow/suck air through either of the large orifices. If it's not closing when the car is off, it's busted. If it IS closing, then you have enough vacuum at idle to open the valve.
|
|
|
|
| Dave_Darling |
Oct 13 2006, 06:57 PM
Post
#3
|
|
914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
|
Yes, you have a bad decel valve.
--DD |
|
|
|
| brownaar |
Oct 15 2006, 07:27 PM
Post
#4
|
|
Member Group: Members Posts: 263 Joined: 23-September 04 From: Gate City, VA Member No.: 2,813 Region Association: None |
Here's another question. If you have the connections from the decel valve to the plenum and the air filter housing backwards, what does the valve do? Do you have an open valve at idle(vacuum leak condition=high idle) or does the valve do nothing. Without checking the valve, I switched the hoses from the plenum and the air filter housing and, voila!, idle has dropped. Did I fix the problem, or is the valve just doing nothing at this point?
|
|
|
|
| 914-8 |
Oct 15 2006, 07:31 PM
Post
#5
|
|
Senior Member Group: Members Posts: 802 Joined: 23-January 06 From: Cal Member No.: 5,461 Region Association: None |
I'd definately just get rid of the decel valve. It's not necessary, and the car drives better without it. I hate the hanging RPMs that happen on cars with decel valves on it.
|
|
|
|
| Dave_Darling |
Oct 16 2006, 08:49 AM
Post
#6
|
|
914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
|
QUOTE(brownaar @ Oct 15 2006, 06:27 PM)  Here's another question. If you have the connections from the decel valve to the plenum and the air filter housing backwards, what does the valve do? If you're talking about the larger-diameter hoses, then you can hook them up either way. I believe if you hook the smaller-diameter hose to the air cleaner, it will simply never open. --DD |
|
|
|
| bd1308 |
Oct 16 2006, 10:25 AM
Post
#7
|
|
Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
the D-Jet one is adjustable BTW.
the L-Jet version needs the hose connected to the plenum, while the two big hoses connect elsewhere. |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 21st May 2024 - 11:13 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.