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elripster · 05-09-2008, 07:31 AM

O2 sensor will make your mileage drop. When they fail, the engine defaults to rich. All O2 sensors are upstream from the Cat so that's Ok.

You might make sure your CEL (check engine light) doesn't have a burned out bulb because it should be sending an error with the sensor unplugged.

I have the 3.0 so I hope that someone will 4 cyl experience will chime in. However, you can check the FSM link on the 86-95 page and it will give you more particulars.

Frank

05-09-2008, 07:31 AM	#2 (permalink)
elripster Registered User Join Date: Feb 2004 Location: Plainfield, IL Posts: 1,295	O2 sensor will make your mileage drop. When they fail, the engine defaults to rich. All O2 sensors are upstream from the Cat so that's Ok. You might make sure your CEL (check engine light) doesn't have a burned out bulb because it should be sending an error with the sensor unplugged. I have the 3.0 so I hope that someone will 4 cyl experience will chime in. However, you can check the FSM link on the 86-95 page and it will give you more particulars. Frank __________________ 1994 4runner, 3.0, auto, 5.71's, Truetrac (rear), 33's, BJ spacers, Coil spacers, air shocks, D-ring anchors, 4Crawler F/R swaybar discos, Marlin rear bumper. www.sdori.com