 Deceleration valve |
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| Montreal914 |
 Apr 18 2011, 09:45 PM
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#1
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Senior Member  Group: Members Posts: 1,568 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California 
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Hello everyone,
I recently started to tacle my high idle issue (stock 2.0 FI). I have read many of the posts about the vacuum line and idle. I did replace all vacuum hoses with the AA kit, which I thought was very nice. I know things are properly connected but my idle is still close to 1500rpm. I disconnected the vacuum line going to the deceleration valve at the air filter end, plugged it, and the idle came down to 1000. The deceleration valve is properly connected with the side port going to the air filter. Is the valve supposed to partially open when idling or is it supposed to be completely closed? Thank you for your input |
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Replies(1 - 6)
| Dave_Darling |
Apr 18 2011, 10:15 PM
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#2
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914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Completely closed at idle. Sounds like it's stuck open or at least leaking.
--DD |
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| Strudelwagon |
Apr 18 2011, 10:28 PM
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#3
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Member Group: Members Posts: 411 Joined: 11-October 08 From: interior, British Columbia Member No.: 9,633 Region Association: Canada |
QUOTE(Montreal914 @ Apr 18 2011, 08:45 PM)  Hello everyone, I recently started to tacle my high idle issue (stock 2.0 FI). I have read many of the posts about the vacuum line and idle. I did replace all vacuum hoses with the AA kit, which I thought was very nice. I know things are properly connected but my idle is still close to 1500rpm. I disconnected the vacuum line going to the deceleration valve at the air filter end, plugged it, and the idle came down to 1000. The deceleration valve is properly connected with the side port going to the air filter. Is the valve supposed to partially open when idling or is it supposed to be completely closed? Thank you for your input Check out this site. It has a great section on the decel valve (scroll down to the dottom) http://members.rennlist.com/pbanders/DJetParts.htm SW |
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| Montreal914 |
Apr 18 2011, 11:14 PM
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#4
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Senior Member Group: Members Posts: 1,568 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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OK, That is what I thought.
Is there a way to check inside or repair thoses? From what I have read in other post I don't think it is possible but I ask. What should I expect to pay for a used one? I know some people run without them and it is for smog purpose but I like to think that if Porsche put it there, I would like to keep it. Thank you for the answer (IMG:style_emoticons/default/smile.gif) QUOTE(Montreal914 @ Apr 18 2011, 08:45 PM) Hello everyone, I recently started to tacle my high idle issue (stock 2.0 FI). I have read many of the posts about the vacuum line and idle. I did replace all vacuum hoses with the AA kit, which I thought was very nice. I know things are properly connected but my idle is still close to 1500rpm. I disconnected the vacuum line going to the deceleration valve at the air filter end, plugged it, and the idle came down to 1000. The deceleration valve is properly connected with the side port going to the air filter. Is the valve supposed to partially open when idling or is it supposed to be completely closed? Thank you for your input |
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| Montreal914 |
Apr 18 2011, 11:17 PM
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#5
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Senior Member Group: Members Posts: 1,568 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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Thank you, I will read carefully (IMG:style_emoticons/default/smile.gif)
QUOTE(Strudelwagon @ Apr 18 2011, 09:28 PM) QUOTE(Montreal914 @ Apr 18 2011, 08:45 PM) Hello everyone, I recently started to tacle my high idle issue (stock 2.0 FI). I have read many of the posts about the vacuum line and idle. I did replace all vacuum hoses with the AA kit, which I thought was very nice. I know things are properly connected but my idle is still close to 1500rpm. I disconnected the vacuum line going to the deceleration valve at the air filter end, plugged it, and the idle came down to 1000. The deceleration valve is properly connected with the side port going to the air filter. Is the valve supposed to partially open when idling or is it supposed to be completely closed? Thank you for your input Check out this site. It has a great section on the decel valve (scroll down to the dottom) http://members.rennlist.com/pbanders/DJetParts.htm SW |
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| blitZ |
Apr 19 2011, 07:25 AM
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#6
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Beer please... Group: Members Posts: 2,223 Joined: 31-August 05 From: Lawrenceville, GA Member No.: 4,719 Region Association: South East States |
I removed my deceleration valve several years ago and have not missed it.
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| Spoke |
Apr 19 2011, 09:04 AM
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#7
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Jerry Group: Members Posts: 6,986 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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If the Deaccel valve is adjusted too low, it will not close up when returning to idle.
You can test the valve by putting a vacuum pump on the sense (small) hose and pumping it down to see where the valve opens up. The vacuum pump I have is one that is sold for vacuum brake bleeding. Never used it for bleeding brake but did use it a lot for FI component testing. |
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