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Join Date: Jul 2002
Location: Grosse Ile, Mi.
Posts: 80
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decelerator valve
I have a 1977 911s, 2.7 cis. I believe I am having a decel valve problem. What vacuum lines are connected to it? Can I bypass it to determine that it may be faulty? My engine seems to be surging when accelerating. The revs will stay high in between gear shifting, but not always. Removing the small line off the top seems to make no difference nor does raising or lowering the stem going into the bell with the adjustment screw.
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06-10-2005, 09:39 PM
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Location: Novato, CA
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Quote:
ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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06-10-2005, 10:08 PM
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The linkage has been cleaned in the past and adjusted for maximum movement/acceleration
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The older I get, the more I realize that patience is a virtue and, I only wish that I had some. |
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06-11-2005, 12:35 AM
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If bypassing the decel valve has no effect, then you are still probably dealing with a sticky linkage...
ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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06-11-2005, 12:38 AM
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Location: Grosse Ile, Mi.
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The linkage has been cleaned and adjusted for maximum motion/acceleration. That was one of the first things that I looked into was to see if the linkage was sticking.
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The older I get, the more I realize that patience is a virtue and, I only wish that I had some. |
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06-11-2005, 12:42 AM
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Join Date: Jul 2002
Location: Grosse Ile, Mi.
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I haven't bypassed the valve yet. Can I do that I guess is the question.
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The older I get, the more I realize that patience is a virtue and, I only wish that I had some. |
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06-11-2005, 12:44 AM
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Join Date: Jul 2002
Location: Grosse Ile, Mi.
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I just went out to the garage and rechecked the linkage. There might have been some drag on it so I cleaned and oiled it up. In the morning I will fire it up to see if it has made any difference. Thank you IANC.
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The older I get, the more I realize that patience is a virtue and, I only wish that I had some. |
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06-11-2005, 02:05 AM
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Registered
Join Date: Dec 2004
Location: Novato, CA
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Quote:
ianc
__________________
BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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06-11-2005, 02:26 AM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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You can try disconnecting the top line (which you have already done) plugging it, and then reattaching it. Or try plugging both the line and the stem.
Also, JW has recommended pulling the line from the side of the WUR on 76 and 77s only. This may help. You may have other vacuum leaks, like around the injectors, the airbox, popoff valve, and AAR. Or your sensor plate/plunger may be sticking.
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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06-11-2005, 05:39 AM
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