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Registered
Join Date: Aug 2007
Posts: 4
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Problem with spontaneous revving on 1980 911 SC
1980 911 SC - I recently had a rebuilt transmission and clutch installed. A few times since I got the car back, when I hit the accelerator from a stop and push to higher RPMs to whip around a corner, the car spontaneously revs to redline and back down repeatedly until I turn off the car. One time when this happened, I tried starting the car several times and it did it over and over, so I turned it off and left it for a while. When I went back after a few hours, the car was fine. Any idea what this could be?
Last edited by rogomatic; 08-15-2010 at 08:03 AM.. Reason: Adding car year, make model |
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08-15-2010, 08:01 AM
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grateful user
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strange, might get under it and make sure you throttle linkage isnt hitting your drive axle. could have been put together wrong after the recent work, does it keep reving and dropping after you come to a stop?
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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08-15-2010, 08:54 AM
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Senior Advisor
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80's era fuel injection is more mechanical than electronic so I'm thinking there is a something binding or interfering with the linkage.
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08 Cayenne Turbo |
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08-15-2010, 09:52 AM
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Registered
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Cruise control cable bracket at the throttle housing hanging up?
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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08-15-2010, 10:03 AM
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Registered
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I had a similar issue with my 80 SC. It would hang on the current rpm sometimes when I let my foot off the accelerator. Turned out to be the linkage running thru the center tunnel. It was hanging up on some other cabling (clutch cable?). I had to gently bend some stuff out of the way.
Does anything squeak when you push the pedal with the engine off and everything quiet?
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Kyle - 1980 RoW non-sunroof 911sc - 3.2 Turbo, Mahle P&C, Carrillo Rods, Megasquirt II (Fuel Only for now), re-geared 3rd and 4th 930 gearbox, 2350lbs |
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08-15-2010, 11:58 AM
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Registered
Join Date: Aug 2007
Posts: 4
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This model doesn't have cruise control, so can't be that. The weird thing is that the engine revs to redline and back down, to redline and back down repeatedly. So perhaps it is a throttle issue (some cable or linkage in the way) but there's a safety mechanism so it revs down?? Someone else suggested vacuum line. Any other thoughts?
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08-16-2010, 04:53 PM
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75 Porsche 911
bike
1970 porsche E
1974 Porsche 911 targa 2.7
Greta
