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Registered
Join Date: Mar 2009
Location: Greenville, SC
Posts: 9
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Extremely High Idle when clutch is pushed???
Hello All
On my 1981 911 SC Targa at start up it idles extremly high (3,000 - 4,500 rpm)when I press in the clutch and give it a little gas. Does anyone have an idea of where to start in solving this issue. I have played wall flower for years looking at this site and waiting for the day I can participate and write about a car of my own. Now I am here and can share the highs and lows of owning this great machine! |
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03-07-2009, 08:45 AM
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Somatic Negative Optimist
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A possibility is that the Bowden cable for the clutch is somehow touching the bellcrank assembly for the TB on the transmission housing.
Clutch cable and accelerator mechanism is close together there.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats.  Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
Last edited by Gunter; 03-07-2009 at 09:04 AM.. |
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03-07-2009, 09:00 AM
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Registered
Join Date: Dec 2003
Location: Arapahoe County, Colorado, USA
Posts: 9,032
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Welcome to THE Forum
 You will find a lot of help here. A common place for the clutch to interact with the accelerator is a mis-placed clutch cable Bowden tube at the accelerator linkage bell-crank at the transmission. Check to see if the Bowden tube is contacting the shaft of the bell-crank. This is at the rear of the transmission mount on the driver’s side. It is also possible for the clutch cable to be on the wrong side of the accelerator rod at the front of the tunnel. If this were the case, it wouldn’t be a subtle interaction at all. This is usually undrivable. Best, Grady
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03-07-2009, 09:00 AM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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You say this just happens @ startup? After driving a while will it idle @ normal speed w/ the clutch in?
If so, I would also check the AAR, which keeps revs up during cold warmups, as well as the decel valve, and the sensor plate and its setting.
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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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03-07-2009, 09:24 AM
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Registered
Join Date: Mar 2009
Location: Greenville, SC
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Thank you very much Gunter & Grady! I will look at that and let you know how it worked out. It is starting to get warm (Spring is on the way) and I am so ready to start driving it more. I see you guys have been on the forum for a while. Trust me... this is the first of many questions from me.
Regards, Madera |
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03-07-2009, 09:31 AM
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Location: Greenville, SC
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I have only had the car for a month and I have not driven it much. About 4 times. What do you mean when you say a while?
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03-07-2009, 09:33 AM
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Join Date: Mar 2009
Location: Greenville, SC
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Paul,
I read the thread on the Decel Valve and I don't that is the problem. I get a normal idle at start up. It is when I press the clutch in and then give it gas and let off the gas... it does not go down, but continues to idle high. |
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03-07-2009, 09:36 AM
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Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,456
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binding plastic bushings at the front throttle bell crank as well as the rear one on the trans can also do it. check the cruise cable at the engine throttle. the black plastic end can pop out of it's holder and hang up. a couple of zip ties takes care of that.
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03-07-2009, 09:40 AM
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Join Date: Mar 2009
Location: Greenville, SC
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Wow! I am impressed with all the feedback that I am getting! I will check it out. I ordered my 101 projects book this week.
Where can I get the most comprehensive diagram of the engine and its components? What book, website, etc.??? |
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03-07-2009, 09:53 AM
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Registered
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Just out of curiosity, After you push the clutch & give it some gas, if it is idiling high, reach down and pull the gas pedel up & see if it drops to a normal idle. (See if the pedel is partially sticking...)
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Kevin '84 Carrera RoW Coupe "I'd like to offer moral support, but I have questionable morals"
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03-07-2009, 09:57 AM
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Registered
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Oh, and for any further direction, were gonna need to see some pics...
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Kevin '84 Carrera RoW Coupe "I'd like to offer moral support, but I have questionable morals"
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03-07-2009, 09:59 AM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Madera 911,
What I meant was this: does this symptom occur just @ startup, or does it continue to happen once the engine is warmed up? Say you've been driving a half hour and then pull up to a stoplight? You only mentioned "at startup".
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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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03-07-2009, 10:00 AM
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Join Date: Oct 2005
Location: UK
Posts: 1,442
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Porsche website has parts diagram available in PDF form:
http://www.porsche.com/usa/accessoriesandservices/classic/genuineparts/originalpartscatalogue/originalpartspdfcatalogue/
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83 911SC Targa Everything I say is my personal opinion, and has nothing to do with my team. |
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03-07-2009, 10:03 AM
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Location: Greenville, SC
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MindtrapX
Yes! When I reach down and pull up the accelerator it idles back down. |
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03-07-2009, 10:21 AM
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Registered
Join Date: Mar 2009
Location: Greenville, SC
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Pics coming soon!!!
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03-07-2009, 10:22 AM
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Registered
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Quote:
 Like you, I have only had my car for a few months and just got some shifting issues fixed this week.
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Kevin '84 Carrera RoW Coupe "I'd like to offer moral support, but I have questionable morals"
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03-07-2009, 11:19 AM
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gjs
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Funny, I think I fixed mine today. It would stick @ 2100 rpm. Would correct when I pulled peddle up. Took off the bushings on transmission, cleaned, WD 40 and reassembled. Think the swepco dripped on it during last trany change, making it stick. Seems ok now, need a few days to be sure.
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03-07-2009, 03:00 PM
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Location: Greenville, SC
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Thanks,
That makes complete sense to me. I will do that and see what happens. |
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03-07-2009, 04:52 PM
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ME 262 (SOLD)
Colibri
Gas Mizer
Mileage King
Dog Bus
1984 Porsche 911 Carrera
