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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,125
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ID'ing sensors on the #3 intake sensor bracket for Carreras
Which plug is the reference and which one is the speed sensor on this bracket?
Someone posted other that what I thought so now I am confused which is which. I can do a continuity test but that'd be too much work...  Bentley shows in the "Ignition" section but only states the OEM labels. I do not have these labels anymore.
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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; 09-11-2011 at 08:23 PM.. |
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09-11-2011, 08:16 PM
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Member 911 Anonymous
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I marked mine with red paint on the connection side for one and fished one at a time. Simple enough.
Whatever you do, DO NOT TWIST the sensors into the mount bracket at the Bell Housing. The sensors are liken to light bulb filaments and they will snap if twisted. Ask me how I know
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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09-11-2011, 09:57 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,125
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If replacing, that is fine. For diagnosing, it'd be nice to known which one you are measuring.
Last edited by Tippy; 09-12-2011 at 04:25 AM.. |
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09-12-2011, 04:16 AM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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Take a look at the notch in the bellhousing. The sensor that reads the teeth is the speed/timing sensor. The sensor that reads the set screw in the flywheel is the reference sensor.
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Kevin L '86 Carrera "Larry" |
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09-12-2011, 05:29 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,125
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I am talking about probing the sensor at the plug that connects on the #3 intake sensor bracket.
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09-12-2011, 06:36 AM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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I know that. But the plugs are exactly the same so you can't tell a difference visually. So go underneath to the transmission and look at which plug is pointing at which location on the flywheel area and trace the wires back to the male-female plug connections on the intake.
If you don't know which ones to plug in right now, just plug 'em in. Doesn't matter which goes where, as it won't harm anything if you're wrong. If it starts, they're connected right. If it doesn't start, then they're plugged wrong. Switch 'em and it'll start right up.
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Kevin L '86 Carrera "Larry" |
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09-12-2011, 06:56 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,125
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The plug arrangement is set a given way on the engine side going to the DME.
Just curious which is which of the two. |
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09-12-2011, 07:14 AM
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Marble Grey
