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VWCOOL
Samba Member
Joined: June 02, 2006
Posts: 1821
Location: Down under
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 Posted: Mon Jun 05, 2006 10:21 pm Post subject: 1976 Beetle fuel injection help |
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Hi all, I have just bought a 1976 Californian-spec Beetle/Bug with EFI.
As I am in Australia and our cars were carb only (mine is an 'import'), information is scarce. I can work out most of it myself, but there is one component of the EFI that is baffling me. It is mounted to the near-side (left-hand as you face the engine bay) engine lid hinge mount and plumbed to the TB and intake pipe, after the air flow meter.
I would guess it is some kind of idle air control valve (IAC) but there is no wiring to it (just a third, smaller pipe stub/vacuum line that is missing - where does THAT go?) and there is already an IAC mounted down under the fan belt, letting air from near the Air Flow Meter to just below the throttle body/cold start injector.
My car has aircon - could it be an 'idle-speed-up' valve for when the air is on?
Can anybody help me?! |
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volkenstein
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Joined: June 26, 2005
Posts: 858
Location: The Land of Oz
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| Posted: Tue Jun 06, 2006 4:44 am Post subject: According to my Bentley |
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VWCOOL,
Ctefeh here...according to my Orange Bentley, that's a "Decel Valve" up behind the left hand side hinge. It should have a large (from behind the hinge) vacuum hose connected to it and a smaller one exiting to the left, can't see the pic properly as it's a real UFO shot...
It's a smog device used for when you are closed throttle decelerating...if faulty, idle speed will be too fast.....again according to the book...
Pics in the manual are crap for where the hoses go....
Maybe someone else has a decent pic of all the FI hoses???
Volkenstein
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71 RHD AS Super - "Klaus"...
Wisdom of youth, energy of old age... |
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VWCOOL
Samba Member
Joined: June 02, 2006
Posts: 1821
Location: Down under
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| Posted: Tue Jun 06, 2006 4:53 pm Post subject: |
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| hey thanks for that - that kinda makes sense. There is a plugged vacuum hose (like a distributor advance hose) sitting around doing nothing close by. Do you reckon this valve opens or closes at closed throttle (I would guess open)? I might have a play... |
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volkenstein
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Joined: June 26, 2005
Posts: 858
Location: The Land of Oz
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| Posted: Tue Jun 06, 2006 6:23 pm Post subject: Pinch it shut.... |
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VWCOOL,
I'll look tonight, there is a specific test (just pinching shut a hose) to determine if it's bung.
"Bruce" posted a pic of an A/C FI engine and "Livens" has one so maybe a direct PM would be worth a shot for a close up of the little blighter?
Volkenstein
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71 RHD AS Super - "Klaus"...
Wisdom of youth, energy of old age... |
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volkenstein
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Joined: June 26, 2005
Posts: 858
Location: The Land of Oz
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| Posted: Wed Jun 07, 2006 1:38 am Post subject: An odd one.... |
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VWCOOL,
Supposed to close during deceleration, doesn't mention it's running state. The test is to pinch the large hose at the rear shut while idling. If idle rises, it should be binned if nothing else is wrong (hoses).
Volkenstein
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71 RHD AS Super - "Klaus"...
Wisdom of youth, energy of old age... |
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DasBug
Samba Member
Joined: May 11, 2006
Posts: 92
Location: NW Iowa
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| Posted: Wed Jun 07, 2006 11:49 am Post subject: |
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Here are couple of pics of my California-bought Super and where the hoses are attached to the engine. You can see the smaller hose and the larger hose in the two pics with the arrows.
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'79 convertible |
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VWCOOL
Samba Member
Joined: June 02, 2006
Posts: 1821
Location: Down under
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| Posted: Fri Jun 09, 2006 7:39 pm Post subject: |
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| thanks for that - I will reconnect the small hose to the device mounted on the hood hinge; it is the 'switching' vacuum that opens the valve on decel and allows some air into the engine |
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