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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
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What is the sensor/switch dead-center, top in the back of a Carrera engine?
In my quest of solving my Carrera bucking and surging at low-RPM's, I saw the sensor/switch in the back of my engine at the top, dead-center very back between the sheetmetal pieces that is not hooked up to anything. I don't think it has been hooked up in many years as the connector has lots of junk in it.
It has a sheath over the lead/wires on it and a 3-prong male connector on the end. It is close to the breather housing. I know it probably is not my issue but curious what it is and I cannot locate it in the PET.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel Last edited by Tippy; 08-25-2011 at 05:56 AM.. |
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08-25-2011, 05:20 AM
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Are you sure it's not the male end of O2 sensor that is just lying in the wrong place?
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Alan Past: '74 914 2.0, '82 911 SC Targa, '88 911 Cabriolet, '88 911 Cabriolet again Present: '00 Boxster S "Happiness is not around the next corner......happiness IS the next corner." |
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08-25-2011, 05:33 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
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No. That one has a 2 female and 1 male plug IIRC.
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08-25-2011, 05:55 AM
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Registered
Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
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sensor
I think he is wondering about the sensor that is a test pick up for the dealers, it ends up near the throttle body behind the fan. it is not a performance issue.
Mike Bruns
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The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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08-25-2011, 06:13 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
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What is it for? Does it connect to anything or is it for dealer diagnostic equipment only?
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08-25-2011, 06:18 AM
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Registered
Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
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sensor
Dealer diagnostics, does not hook to anything else
Mike Bruns
__________________
The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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08-25-2011, 06:25 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
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Quote:
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel |
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08-25-2011, 06:33 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
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Curious, is it another speed-reference sensor?
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel |
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08-25-2011, 07:12 AM
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Quote:
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Mike 1976 Euro 911 3.2 w/10.3 compression & SSIs 22/29 torsions, 22/22 adjustable sways, Carrera brakes |
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08-25-2011, 07:45 AM
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Registered
Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
Posts: 5,238
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Quote:
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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08-25-2011, 08:26 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
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Excuse the dirty/oily engine. That was taken pre-rebuild........
 
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel |
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08-25-2011, 10:21 AM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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Correct. That one in the picture is the "diagnostic" TDC sensor. It does nothing to affect the behavior of the engine
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Kevin L '86 Carrera "Larry" |
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08-25-2011, 10:46 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
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Quote:
__________________
Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel |
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08-25-2011, 12:18 PM
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1976 Porsche 911
