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safe's Avatar
 
Join Date: Feb 2004
Location: Sweden
Posts: 4,149
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Deceleration Valve defective?

Hi
My idle is way to high, ~18-2000 rpm.

If I squeeze the top vacuum hose together the idle drops to a more normal rpm.
With that description is it safe to say that its kaputt?



Its kind of expensive, I guess I can live without it. If I remove it I should plug all vacuum hoses right?

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Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
Old 08-05-2006, 07:56 AM
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Location: Novato, CA
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Guess what, it's adjustable! Back off the locknut and turn in the stem clockwise to increase the spring tension against the diaphram 'til you get it to idle.
Old 08-05-2006, 09:37 AM
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I'll try that.
I read about it but I thought it only controlled the rpm it held for a few seconds.
__________________
Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
Old 08-05-2006, 10:37 AM
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Join Date: Feb 2004
Location: Sweden
Posts: 4,149
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Adjusted it and it now workes fine!
I have to remove it and put it in a vice to break the lock nut free.
__________________
Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
Old 08-21-2006, 07:41 AM
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Quote:
Its kind of expensive,
Glad you were able to save a few bucks ( or whatever they are in Sweden).

Joe
Old 08-21-2006, 07:58 AM
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Join Date: Feb 2004
Location: Sweden
Posts: 4,149
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Actually I'm not sure the "adjusting" fixed the problem.

It is adjusable, the revs and time changed when I turned stem, but when have broken loose the lock nut and reinstalled it the problem was gone. I guess it just needed a good spanking

__________________
Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
Old 08-21-2006, 08:04 AM
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