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Reference Sensors

Hello Everyone,
I know of the two reference Sensors on the 944 engine (one for measuring engine speed and the other for measurinfg crank position). I see those sensors listed second in this page from The Parts Bin website but what is this first sensor listed? Any ideas?

Thanks, Michael

http://catalog.thepartsbin.com/?year=1987&make=PO&imageField.x=20&imageField.y=12
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Michael R. Ganshirt

Silver 1987 924S
1995 VW Passat GLX Wagon
1986 Audi 4000S

Ausgabe Geld auf meinem porsche ist gesuender als das Spielen und Drogegebrauch.
Old 10-02-2003, 01:14 PM
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They should be identical.
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1983 944 Lux (manual) 2.5 litre 8 valve na and no pas

1991 944 (automatic) 2.7 litre 16 valve na and pas

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Old 10-02-2003, 01:18 PM
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What they have listed there is something diferent though. Must be an efor in their catalog, eh?
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Michael R. Ganshirt

Silver 1987 924S
1995 VW Passat GLX Wagon
1986 Audi 4000S

Ausgabe Geld auf meinem porsche ist gesuender als das Spielen und Drogegebrauch.
Old 10-02-2003, 01:25 PM
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I think the double overhead cam model uses just the one sensor for both speed and tdc measurement and has a different connection because of this. If you have two sensors you need the lower of the two in the catalogue.
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1983 944 Lux (manual) 2.5 litre 8 valve na and no pas

1991 944 (automatic) 2.7 litre 16 valve na and pas

"I have only five words for you: From my cold, dead hands."
Old 10-02-2003, 01:30 PM
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The two reference sensors are identical, same part#
But there is also a TDC sensor located next to the reference sensors.
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Vinny
Red '86 944, 05 Ford Super Duty Dually '02 Ram 3500 Diesel 4x4 Dually, '07Jeep Wrangler '62 Mercury Meteor '90 Harley 1200 XL
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Old 10-03-2003, 04:29 AM
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Really? I haven't come across that third sensor . I'll have a peek this weekend. Thanks for the info folks.

Michael.
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Michael R. Ganshirt

Silver 1987 924S
1995 VW Passat GLX Wagon
1986 Audi 4000S

Ausgabe Geld auf meinem porsche ist gesuender als das Spielen und Drogegebrauch.
Old 10-03-2003, 11:59 AM
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When you look at the engine from above, the TDC sensor is located to the right of the reference sensors on the same bracket.
It's round with a wire on it.
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Vinny
Red '86 944, 05 Ford Super Duty Dually '02 Ram 3500 Diesel 4x4 Dually, '07Jeep Wrangler '62 Mercury Meteor '90 Harley 1200 XL
"Live your Life in such a way that the Westboro Baptist Church will want to picket your funeral."
Old 10-03-2003, 04:49 PM
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only later model 944 (85.5 and up I belive)have the third sensor it's just for diagnostics so you only need the two and they have the same part #
I had the three sensor model on the 87 engine I bought and I was told that the third sensor was totally unnesseary.
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Old 10-03-2003, 05:33 PM
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Actually I ran into this on my Early '85 944 which I think has the same motor layotu as the '87 924S. I had only the two identical sensors. I removed and replaced one for a broken connector, and removed and cleaned the other. They are magnetic so they pick-up bits of metal which may disturb the signal. Later motors have a seperate TDC sensor that is different and is mounted near the two twins.
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'85 (Early) 944 - Beater
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Old 10-03-2003, 06:08 PM
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