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Too big to fail
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3.6L O2 Sensor - on or off?
I see that some people disconnect the O2 sensor on their engines, even the 3.6Ls - why? What are the benefits/drawbacks?
FWIW, mine is connected.
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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07-04-2002, 01:55 PM
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Join Date: Jan 2002
Posts: 650
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I don`t know why anyone woukd unhook it. Mine is also hooked up. W/O your system would go into and open loop with a default setting at idle and part load. At WOT it dumps so much fuel that the O2 sensor is not a factor.
Tinker |
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07-04-2002, 10:31 PM
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Join Date: Mar 2002
Posts: 3,563
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The O2 sensor on my 3.2 Carrera (turbo) is also disconnected.
This makes the A/F ratio richer as the O2 sensor (when connected) forces the Motronics to run in the 13.x:1 A/F range. A bit too lean for a turbo application. Hope that helps FWIW...
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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07-05-2002, 04:01 AM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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If you must disconnect it for some reason, why not just connect a switch in the sensor signal wire so you can control when it operates? During part throttle operation a rich mixture can potentially dilute the oiling system, foul the plugs and decrease fuel mileage.
Sherwood Lee http://members.rennlist.org/911pcars |
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07-05-2002, 09:34 AM
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