O2s dont come on, guy isnt sure why. Someone told him because its in SD...
O2s dont come on, guy isnt sure why. Someone told him because its in SD...
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
Got a log?
O2 mV just sits around 450Originally Posted by mecanicman
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
That indicates its not tune related, more like o2 sensors not plugged in or wired wrong. Nothing wrong with o/s.
customer insists theyve checked everything
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
MAF / SD-only has nothing to do with open or closed loop.
Faulted O2s can put you in open loop. I have seen the O2s
get "pinned" to 450mV from some faults but I have some
folks on LS1Tech disputing this. Still, I know what I've seen.
But I can't say I have a good idea as to why, specifically
(what test or what kind of fault).
Might start with looking at how DTCs / codes may have been
"handled". Look at O2 sensor activity (waveforms) right after
clearing codes or writing a tune file, do they start off active
and then flatline to the middle? A dead sensor should flatline
near zero, stuck at midrange is the PCM's doing.
Customer may have checked "everything" that occurred to
them. Customer is probably not an expert and clue-quantity
is highly variable.
People always insist nothing wrong with it till you show them otherwise. O2 sensors read 450mv when unplugged. If they were plugged in and working but just not going into closed loop you would see them change, this is where the log would be useful. I've looked through your tune, it's not a dtc or settings issue.
they just sit there flat lined
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
02 sensors are not wired correctly or not plugged in. Whats up with the speed sensor?
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