O2 Sensor
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Joined: Sep 2007
Posts: 172
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From: Southampton, MA
Car: 89 Firebird Formula
Engine: 305 Vortec, Single-plane, 4 barrel
Transmission: T5, soon 700R4
Axle/Gears: 88 10 Bolt, Disc, Auburn, 3.23
O2 Sensor
So I did a lot of things to my car, one thing was a new O2 sensor. The car runs terribly rich and fail emissions. You can smell it easily. Misses aswell.
But My OTC Monitor 2000 makes it appear that the ECM is getting a good reading from the O2 and the car is acutally lean more often than rich.
So, should I perhaps swap the sensor in case the new Bosch one was defective?
-Dave
But My OTC Monitor 2000 makes it appear that the ECM is getting a good reading from the O2 and the car is acutally lean more often than rich.
So, should I perhaps swap the sensor in case the new Bosch one was defective?
-Dave
Supreme Member
Joined: Jul 2005
Posts: 1,675
Likes: 3
From: Arab, Alabama
Car: 1988 Trans Am GTA
Engine: 350 4BBL
Transmission: 700R4
Axle/Gears: 3.27
Re: O2 Sensor
Try putting the old one back in. (now, I know you didn't throw it away...)
Is the end of the exhaust within 2 feet of the o2 sensor? Ie
pen exhaust
Is the end of the exhaust within 2 feet of the o2 sensor? Ie
pen exhaust 
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HoosierinWA
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Oct 7, 2015 10:15 AM