closed loop
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
Yes, so either there is a fault in the O2 circuit, or you it is not getting hot enough. It appears that you have some cross counts recorded which would mean it's been in closed loop during the log. If I had to guess? I'd say it has headers, and the O2 was relocated to the collector, and doesn't stay hot enough at idle and goes open loop. Install a heated O2 and problem solved.
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Melting Slicks
Joined: Aug 2003
Posts: 3,389
Likes: 391
From: Lakeville MI
For the O2 to go ready, it needs to swing < 199 mv or > 699 mv.
;
; o2 RDY HYST PAIR
; (CAL = vdc * 2260
;
LC55E FCB 158 ; 699 mvdc, If o2 Volts GT THESH then o2 ready
LC55F FCB 45 ; If o2 < 0.199 VDC then o2 is ready
No closed loop until O2 is ready.
Heated O2 will generally go ready quicker and stay hot enough to maintain closed loop under most conditions. Get a 4 wire sensor to eliminate ground issues.
;
; o2 RDY HYST PAIR
; (CAL = vdc * 2260
;
LC55E FCB 158 ; 699 mvdc, If o2 Volts GT THESH then o2 ready
LC55F FCB 45 ; If o2 < 0.199 VDC then o2 is ready
No closed loop until O2 is ready.
Heated O2 will generally go ready quicker and stay hot enough to maintain closed loop under most conditions. Get a 4 wire sensor to eliminate ground issues.
Safety Car
Joined: Sep 2001
Posts: 4,150
Likes: 552
From: Glenbeulah Wi
Yes, so either there is a fault in the O2 circuit, or you it is not getting hot enough. It appears that you have some cross counts recorded which would mean it's been in closed loop during the log. If I had to guess? I'd say it has headers, and the O2 was relocated to the collector, and doesn't stay hot enough at idle and goes open loop. Install a heated O2 and problem solved.
