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Registered
Join Date: Mar 2005
Location: Carnation, Wa
Posts: 202
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Throttle response not what it was
When I first got my 1980 SC a few months ago, the throttle response was absolutely electric. I would blip the throttle and the revs would just SCream to-wards red-line.
Recently the throttle response has slowed down quite noticeably. I cannot correlate this decrease in responsiveness to any particular thing. No recent maintenance events or improvements correlate to the decreased responsiveness. I observe two new behaviors: 1. Blipping the throttle in neutral the revs climbs more slowly with a slight roughness. 2. When the car is just beginning to warm up, the revs have a hard time stabilizing when the throttle is suddenly closed. Thanks, Matt
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Matt West 1980 911 SC |
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05-21-2005, 04:51 PM
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Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Might do a search on the frequency valve.
Joe |
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05-21-2005, 04:57 PM
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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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When you got it a few months ago, it may have been cooler. You may need to lean it out a bit. Souk posted a thread on this last fall...search on that. I need to adjust my mix as well...lazy me..
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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05-21-2005, 05:01 PM
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Join Date: Mar 2004
Location: Los Angeles
Posts: 17,383
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You are getting use to the car. When I first got my 911, it was Faaast. Now I am ready to make it faster, but $$$$$$$$.
Jeff |
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05-21-2005, 05:15 PM
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Location: Novato, CA
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05-22-2005, 01:21 AM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Second VaSteve. See if leaning i/16 turn helps. If still not ,try another 1/16 turn. If that doesn't work, let us know.
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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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05-22-2005, 06:51 AM
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What about the vacuum advance? I found a similar problem with my car and removed the hose from the vacuum advance, plugged the holes, BAM whole new car.
I might not know if this is right, but if all else fails I just wanna throw this out.
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Matthew “Sometimes the questions are complicated and the answers are simple.” |
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05-22-2005, 07:53 AM
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Join Date: Mar 2005
Location: Carnation, Wa
Posts: 202
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Just wanted to update this post with the answer...
The fuel air mixture was off. CO was at a 6 and adjusted down to 2.5. Probable cause was cleaning the gunk from around the air sensor plate. Throttle respone is electric again 
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Matt West 1980 911 SC |
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06-01-2005, 05:50 PM
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1979 Porsche 911 SC (ROW) Rebuilt 3.0
