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Registered User
Join Date: Feb 2008
Location: Bayside Wi
Posts: 2,562
Overboost control

On my stock 77 930 I drove it into heated dehumidified storage last fall. The fuel pumps are humming now but will not start. I noticed the boost gauge was showing some boost before I put it away when just driving normal and spiking almost to the 1.3 mark under very light throttle. My thought is the overboost sending unit is Kaput. Where is that overboost cut off sending unit located and the control unit that monitors it? I probably have spares if I knew where located and what they looked like. Thanks. All the modded ones start right up after winter storage. Contrary to popular opinion the pristine original is the one with a problem, go figure. Hate to put it on a trailer and not able to find a Porsche expert to make a house call just yet.
Anthony @ Voitureltd Bayside WI.

Last edited by voitureltd; 06-20-2017 at 01:03 PM..
Old 06-20-2017, 12:26 PM
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Registered User
Join Date: Apr 2011
Location: Santa Cruz, CA
Posts: 955
The overboost switch is the small hex with wire attached on the intake manifold. On the 1977 it is about 2" to the right of the boost guage sending unit.

Hope this helps!

Old 06-20-2017, 01:14 PM
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infraredcalvin's Avatar
Join Date: Sep 2007
Location: Ladera Ranch, CA
Posts: 1,271
1st page of the "my car won't start" sticky... the overboost switch is the one with the smaller square around it. It should be looking right at you on the 77 intake... take off the wire and ground it (stock or not, there is an empty spade terminal near mine that works well for this).

Infraredcalvin - AKA Pat
'76 Turbo Carrera #311 - Factory LSD, Sport Seats
'75 914 GT clone project
'74 914 track basket-case
Old 06-20-2017, 06:25 PM
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