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After o2 sensor plugged in runs bad
1985 carrera runs great. 80,000 miles. installed new o2 sensor now it surges and bucks slightly. at transition. (even throttle). any ideas out there?
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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07-24-2009, 02:32 PM
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Member 911 Anonymous
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Check to insure the sensor is properly connected. MIne came loose and it caused havoc.
Make certain the harness is not broken or the metal shield is touching anything metalic, it will cause a false reading on the ECU(DME)
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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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07-24-2009, 02:36 PM
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I did a search after my post (stupid), i have my afm off and i will tweak it tomorrow and post results. i think it's running rich and hope for good things tomorrow.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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07-24-2009, 03:59 PM
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Do you have a LM1 to confirm AFR?
If not you can use a DVM to your O2S to get rough reading. Break a Leg 85
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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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07-24-2009, 04:10 PM
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Quote:
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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07-25-2009, 04:25 AM
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Member 911 Anonymous
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Do you have a Digital Volt Meter?
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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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07-25-2009, 08:12 AM
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I have a blue point dvm. I checked the o2 sensor output this am it was .50 .
i checked the afm and tweaked it. Still surges with o2 plugged in. no induction leaks, plugs new, wires almost new, valves adjusted.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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07-25-2009, 08:22 AM
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Member 911 Anonymous
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Did you check the value after you brought her up to running temps?
I assume yes. Adjust AFM to 0.80 volts, then jumper the B & C and set your base idle. If stock 780-800 or if SW Chipped 880-900 RPMs
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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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07-25-2009, 08:33 AM
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muck-raker
Join Date: Jan 2009
Location: Coastal PNW
Posts: 3,059
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I don't mean to hijack, but where do you adjust the AFM??? I can't find it in my Bentley. 
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STONE '88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended.  Deny Everything; Admit Nothing; and Always Make Counter-accusations 
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07-25-2009, 08:40 AM
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Member 911 Anonymous
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Hey KidRock,
When you look at the AFM in the engine bay. it is the left rear corner. It may have a cap that needs to be tapped out. There is a thread on that. If open, then someone has tampered with it in the past. Uses a 3MM Allen Wrench.
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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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07-25-2009, 08:43 AM
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1974 Porsche 911 targa 2.7
Marble Grey
