BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 So who knows a thing or two about oxygen sensors?

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JRS9C1

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Posts : 434
Join date : 2009-01-20
Age : 27
Location : Bethel ME

PostSubject: So who knows a thing or two about oxygen sensors?   Mon Apr 25, 2011 6:14 pm

My sensors are screwed up right now...car runs good but O2s says that it's running rich? I would think it'd be running rough with incorrect or strange reading that are out of normal parameters.

FYI car is OBDII equipped and both rear O2s have *supposed* to have been deleted by Alex @ PCMPerformance.

Bank 1 is driver's side bank with cylinders 1,3,5,7.
Bank 2 is cylinders 2,4,6,8.

Sensor 1 is what should be reading (ideally) at around 0.5 V.

Here's what I was looking at when I pulled the car into the shop.

Bank 1 Sensor 1 - 0.911 V
Bank 1 Sensor 2 - 0.442 V
Bank 2 Sensor 1 - 0.442 V
Bank 2 Sensor 2 - 0.915 V


I thought this was weird and remembered when I installed my headers that bank 2 O2 sensor was difficult to clip and unclip. So I figured I plugged it into sensor 2 when it should be located in sensor 1.

Switched the O2 from sensor 2 to sensor 1 on bank 2 and got this.

Bank 1 Sensor 1 - 0.915 V
Bank 1 Sensor 2 - 0.442 V
Bank 2 Sensor 1 - 0.442 V
Bank 2 Sensor 2 - 0.438 V

I'm pretty confused as to what needs to happen. I guess the way to locate and confirm O2 location is to check for the color wires on the electrical connector and see where they are located in the PCM.

Any guesses anyone?
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sdstick

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Posts : 4284
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: So who knows a thing or two about oxygen sensors?   Mon Apr 25, 2011 7:25 pm

Trying to figure out what your asking.
So Sensor 2 on both sides should be programmed out so they dont need to be plugged in right?
Seems like that .442 area is correct and a steady .442 sounds like a programming setpoint.
So switch the wires on bank 1 sensors & see if it settles at .4XX?

Doesnt look like color will help

http://ss.lencolab.com/diagrams/impala_engine_2of3.pdf

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
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JRS9C1

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Posts : 434
Join date : 2009-01-20
Age : 27
Location : Bethel ME

PostSubject: Re: So who knows a thing or two about oxygen sensors?   Mon Apr 25, 2011 9:31 pm

Yes both rear O2s programmed out.

The question is why would the programmer make Bank 1 sensor 2 and Bank 2 sensor 1 a set value? Why'd he make bank 2 sensor 1 a set value where that's the one input on that bank that needs to be operating correctly?

Maybe send alex an email to see what he does when he deletes the rear O2s on a 96?
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waynes91

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Posts : 221
Join date : 2009-03-05

PostSubject: Re: So who knows a thing or two about oxygen sensors?   Mon Apr 25, 2011 10:38 pm

dont know nothing about o2's but the vast majority said to use ac delco 02s for bbodies,
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