Effects of different 02 sensors

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Jan 8, 2007 | 05:01 AM

2002ScottOnyxSS

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From: New York

Effects of different 02 sensors

Trying to diagnose a pig rich and stalling condition on a newly installed 96 LT1 (OBD-II) in a 68 camaro.

At idle, the emissions are pretty bad...gasoline smell in whatever you are wearing.

I hooked up autotap and found a pretty constant 45 mV on B1S1 and very lazy 375-425 mV on B2S1.

When I brake for a light or stop sign, the car typically stalls. Power brake
application is forcing a very rich condition, maybe? I need to do some more runs..

I pulled the front O2 sensors (no rears) and found two different model sensors. Left was 4E31 (unknown brand, very small diameter), right was AC AFS 138.

I was hoping to swap in two LS1 O2's to see if that made a difference, but the connectors were a different config

Would the two different 02 sensors make a difference and explain some of the above?
I will probably just order two new OEM O2s and call it a day...

Programming by PCMForLess. No codes detected, but the programming is basic air/fuel/spark..alot has been programmed out.
I need to get 'Edit soon, but that is another story

thanks
Scott