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01-08-2006, 02:34 PM
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#1 |
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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...
Nope....it simply "connects", no resistors, diodes, capacitors...nothing. To clear one doubt,...are you checking the O2 signals right at the ECM connector wires? .....did you pierce the O2 wires as near as possible to the ECM connector? (sorry, two doubts). LUK
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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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01-08-2006, 03:06 PM
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#2 |
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Registered Member
Join Date: Feb 2002
Location: Jacksonville, FL
Posts: 706
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Re: O2 sensor help...
Okay,
now i just checked the o2 signal from each sensor by taking a reading from the pierced upper left white wire on each sensor harness while the car was running and at operating temp. Only got .4 volts ish on the left and 1.4 vdc on the right. they are only three wire 02's, so I'm interpolating the chart. Going to do the key off test now, I'm going to be p-od if I ruined these 02's already.
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1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy |
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01-08-2006, 03:27 PM
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#3 |
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Registered Member
Join Date: Feb 2002
Location: Jacksonville, FL
Posts: 706
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Re: O2 sensor help...
got no voltage on the upper left,
got .67 vdc on the black and got an intermittent 12vdc on the upper right... sound right? sounds like the 02 is bad...good power, just no signal.
__________________
1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy |
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01-08-2006, 04:26 PM
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#4 |
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Registered Member
Join Date: Feb 2002
Location: Jacksonville, FL
Posts: 706
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Re: O2 sensor help...
replaced 'em again. no change...checking for voltage at pcm
I used bosch 02's from advance auto parts. going to do a continuity check too from the sensors to the harness...
__________________
1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy |
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01-08-2006, 05:10 PM
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#5 | |
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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
__________________
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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