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01-08-2006, 05:10 PM
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Registered Member
Join Date: Oct 2005
Location: Sabana Grande, Puerto Rico
Posts: 33
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Re: O2 sensor help...
Quote:
The 12vdc is in the O2's for heating purposes only, not for signal voltage generation. They react to the presence (or absence) of oxygen in the stream and generate the voltage signal. If engine is off and after a short period of time, the signal voltage from the O2's should be very close to 0.0vdc=very lean=no exhaust fumes. Check this tech article on its description. Even though it's Audi related, it is a very good description of the O2 sensor. I think your problem is more a wiring issue first, and a possible set of bad O2's second. Once you get the wiring problem squared and replace the O2's, check them out in a KOER self-test. LUK/GL
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ACRONYMS: LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That and the classic... DILLIGAS=Do I Look Like I Give A S*** 1986 Mustang GT w/T-Tops  NOW: 5.0L Stock SB, X303 Cam, 700 cfm DP Holley, 289 '66 Heads, 1.7 RR, Richmond Gear 4+1 Tranny, Centerforce DF, 2.73 Gears WIP: 3.90 Gears, LS Overhaul, Adj. LCA's & UCA's (Granatelli), T-Top weather striping and rear braces bodywork 
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