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-   -   What is the sensor/switch dead-center, top in the back of a Carrera engine? (http://forums.pelicanparts.com/porsche-911-technical-forum/626514-what-sensor-switch-dead-center-top-back-carrera-engine.html)

Tippy 08-25-2011 05:20 AM
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.

Poor-sche Lover 08-25-2011 05:33 AM
Are you sure it's not the male end of O2 sensor that is just lying in the wrong place?

Tippy 08-25-2011 05:55 AM
No. That one has a 2 female and 1 male plug IIRC.

MBruns 08-25-2011 06:13 AM
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

Tippy 08-25-2011 06:18 AM
What is it for? Does it connect to anything or is it for dealer diagnostic equipment only?

MBruns 08-25-2011 06:25 AM
sensor
 
Dealer diagnostics, does not hook to anything else
Mike Bruns

Tippy 08-25-2011 06:33 AM
Quote:
Originally Posted by MBruns (Post 6217165)
Dealer diagnostics, does not hook to anything else
Mike Bruns
Thanks

Tippy 08-25-2011 07:12 AM
Curious, is it another speed-reference sensor?

IROC 08-25-2011 07:45 AM
Quote:
Originally Posted by Tippy (Post 6217265)
Curious, is it another speed-reference sensor?
IIRC, it's a top dead center (TDC) sensor.

86 911 Targa 08-25-2011 08:26 AM
Quote:
Originally Posted by Tippy (Post 6217032)
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.

Tippy 08-25-2011 10:21 AM
Excuse the dirty/oily engine. That was taken pre-rebuild........:eek:

http://forums.pelicanparts.com/uploa...1314296473.jpg

KTL 08-25-2011 10:46 AM
Correct. That one in the picture is the "diagnostic" TDC sensor. It does nothing to affect the behavior of the engine

Tippy 08-25-2011 12:18 PM
Quote:
Originally Posted by KTL (Post 6217686)
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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