Anderson PMS 02 readings...

Hozer 88GTConv · 11-07-2006, 05:54 PM

Gents,
The stang has been in layup for a while and I started driving it again regularly last week.
I've noticed the 02 sensor readings on my Anderson PMS data screen are all over the place. I know that the stock 02's are non-linear so it never sits at .46 like it's supposed to.
My prob is that the readings fluctuate from .00 to .72 and everything in btwn.
Is this typical with stock 02's or has anyone managed to get some voltage stability with stock 02's?

richs347 · 11-07-2006, 07:18 PM

I see the same thing on the stock 02 reading - but on my PMS on the wideband reading it sees the correct voltage and gives the right read out. If you're only looking at the stock 02's I'd be inclined to say what you see is ok...

Hozer 88GTConv · 11-08-2006, 09:19 PM

Thanks Rich,
I haven't installed my wideband yet. It's been in the trunk for over a year, yeah I know...lame.
Doesn't do a hell of a lot of good in there...

Jeff Chambers · 11-09-2006, 08:18 AM

O2 readings should be toggling. That's how the computer manages when in closed loop. Only in open loop will you see a steady O2 output, hopefully at your commanded lambda. In closed loop, the O2 should toggle anywhere from about .1V to .8V with .45V being stoichiometric. The computer will add a small amount of fuel; when the O2 responds with a voltage above .45V the computer then removes a small amount of fuel and looks for the O2 voltage to fall below .45V. This toggling action is the computer's management of fueling. It then learns and makes corrections based on the amount of fuel it has to add to induce this toggling.

Hozer 88GTConv · 11-09-2006, 10:28 PM

Thanks, Jeff. I just wanted to confirm that it's just pointless trying to tweek the fuel curves with the stock 02 sensor outputs to the pms.
Without the wideband or some time on the EGA, it seems tough.

11-07-2006, 05:54 PM	#1
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Anderson PMS 02 readings... Gents, The stang has been in layup for a while and I started driving it again regularly last week. I've noticed the 02 sensor readings on my Anderson PMS data screen are all over the place. I know that the stock 02's are non-linear so it never sits at .46 like it's supposed to. My prob is that the readings fluctuate from .00 to .72 and everything in btwn. Is this typical with stock 02's or has anyone managed to get some voltage stability with stock 02's? __________________ 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

11-07-2006, 07:18 PM	#2
richs347 Registered Member Join Date: Mar 2002 Location: Manassas, VA Posts: 24	Re: Anderson PMS 02 readings... I see the same thing on the stock 02 reading - but on my PMS on the wideband reading it sees the correct voltage and gives the right read out. If you're only looking at the stock 02's I'd be inclined to say what you see is ok... __________________ 1992 GT; 347 w/ a Vortech V2 SQ S-Trim, PMS, ... www.mustangpartstech.com

11-08-2006, 09:19 PM	#3
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: Anderson PMS 02 readings... Thanks Rich, I haven't installed my wideband yet. It's been in the trunk for over a year, yeah I know...lame. Doesn't do a hell of a lot of good in there... __________________ 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

11-09-2006, 08:18 AM	#4
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: Anderson PMS 02 readings... O2 readings should be toggling. That's how the computer manages when in closed loop. Only in open loop will you see a steady O2 output, hopefully at your commanded lambda. In closed loop, the O2 should toggle anywhere from about .1V to .8V with .45V being stoichiometric. The computer will add a small amount of fuel; when the O2 responds with a voltage above .45V the computer then removes a small amount of fuel and looks for the O2 voltage to fall below .45V. This toggling action is the computer's management of fueling. It then learns and makes corrections based on the amount of fuel it has to add to induce this toggling. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

11-09-2006, 10:28 PM	#5
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: Anderson PMS 02 readings... Thanks, Jeff. I just wanted to confirm that it's just pointless trying to tweek the fuel curves with the stock 02 sensor outputs to the pms. Without the wideband or some time on the EGA, it seems tough. __________________ 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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