Last post on Sep 17, 2012 at 11:52 AM
You are in the Maintenance & Repair
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Engine, Fuel System
#458 of 460 Re: 91 S10 Blazer running rich, stalling on deceleration [rfletcher]
Sep 17, 2012 (7:32 am)
Is the O2 sensor a 3 wire unit, with the built-in heater? Maybe the heater circuit is open.
#459 of 460 Re: 91 S10 Blazer running rich, stalling on deceleration [srs_49]
Sep 17, 2012 (11:52 am)
Thanks, No, it's a new replacement O2 but the original one wire type. That's why I considered changing to the heated version. Real pain to do and a lot more expensive but would probably solve if not correct the problem. Seems a vicious circle. As I understand it, among other things, excess fuel will tend to cool the exhaust and non functioning / cooler than normal O2 will cause excess fuel. Maybe someone smarter than me can explain it.