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Registered
Join Date: Jun 2006
Location: Virginia Beach
Posts: 556
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72 T MFI microswitch
I recently purchased a 72T with MFI. I've got it running okay, but when trouble shooting noticed it didn't have a throttle micro swithc on the stack. Don't see any wiring either. Did all MFIs have this switch? or?
My 72S has one. Any help or advice would be appreciated. Rusty Virginia Beach |
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12-02-2008, 06:51 AM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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Most folks remove it; it was there for emissions purposes and is a typical cause of numerous problems related to popping and farting in the intake tract. Keep it off unless you are going concours. Even then, install and disconnect.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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12-02-2008, 07:00 AM
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Registered
Join Date: Jun 2006
Location: Virginia Beach
Posts: 556
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thanks
It's just a driver and long range project or?
Thanks again for the quick reply. |
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12-02-2008, 07:08 AM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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Actually, it is there for fuel economy and to keep the engine from loading up on overrun. Search here for "speed switch" and "early_s_man" and then report back with questions.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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12-02-2008, 08:55 AM
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Max Sluiter
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I went through great pains to get the fuel shutoff circuit back to working order.
The microswitch and solenoid worked but I needed to buy and refurbish the RPM transducer. It makes a big difference. Better fuel economy, a crisper exhaust note, and better throttle response- engine braking is much better now. There is much less "popping" from the exhaust. Anything now is just little lean "ticking" noises at idle with the high-overlap cams.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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12-02-2008, 09:43 AM
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1971 Porsche 911S
