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Chain fence eating turbo
 
Join Date: Dec 2008
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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 P & C's, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, depending on mood , 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 wheels (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..
Old 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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Old 08-25-2011, 05:33 AM
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Chain fence eating turbo
 
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No. That one has a 2 female and 1 male plug IIRC.
Old 08-25-2011, 05:55 AM
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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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Old 08-25-2011, 06:13 AM
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Chain fence eating turbo
 
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What is it for? Does it connect to anything or is it for dealer diagnostic equipment only?
Old 08-25-2011, 06:18 AM
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sensor

Dealer diagnostics, does not hook to anything else
Mike Bruns
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Old 08-25-2011, 06:25 AM
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Chain fence eating turbo
 
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Quote:
Originally Posted by MBruns View Post
Dealer diagnostics, does not hook to anything else
Mike Bruns
Thanks
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, depending on mood , 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 wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 08-25-2011, 06:33 AM
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Chain fence eating turbo
 
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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 P & C's, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, depending on mood , 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 wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 08-25-2011, 07:12 AM
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Quote:
Originally Posted by Tippy View Post
Curious, is it another speed-reference sensor?
IIRC, it's a top dead center (TDC) sensor.
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Old 08-25-2011, 07:45 AM
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Quote:
Originally Posted by Tippy View Post
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.
For a positive I.D., post a picture.
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Old 08-25-2011, 08:26 AM
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Chain fence eating turbo
 
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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 P & C's, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, depending on mood , 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 wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 08-25-2011, 10:21 AM
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KTL KTL is offline
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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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Old 08-25-2011, 10:46 AM
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Chain fence eating turbo
 
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Quote:
Originally Posted by KTL View Post
Correct. That one in the picture is the "diagnostic" TDC sensor. It does nothing to affect the behavior of the engine
Thanks

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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, depending on mood , 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 wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 08-25-2011, 12:18 PM
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