Hooked the scanner up to the car today and 02's are stuck at .450 and there are no fuel trim readings?
Just finished a heads and cam swap on 99 LS1 motor. Grounds are all connected, everything is plugged in, just seems like it wont come out of open loop. When using VCM controls to command closed loop the car goes rich and dies.
Anyone have any ideas?
you have stft disabled
enabled them and reloaded the tune, no change, so I swapped in a good working O2 and still no change. thanks for the quick reply tho.
I would think even if STFT was disabled and your in OL, you would still have o2 voltage variances being scanned if they are still in the exhaust stream and are plugged in.
Flat line to me means the o2s are not reporting or not plugged in.
Last edited by smithers; 07-23-2011 at 08:16 PM.
Have you messed with the o2 switchpoints?
If they're stuck at 450mv, give or take a few, they're disconnected. Maybe not unplugged, but an issue with the connection. Unplug them and you'll see the same values.
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This was correct... there was a problem in the harness, and has been resolved, thanks everyone!Originally Posted by edcmat-l1
Ran into this issue with a car today, told the customer to unplug the 02's and we had the same issue. It has to be in the harness, will post up as soon as we find something.
Email Tunes, [email protected]
96 TA Blown/Stroked, 4L80E/Fab 9
15 C7 A8 H/C 2.3 Blower/PI
14 Gen 5 Viper
Custom Mid Engine chassis, AKA GalBen C
Ben Charles, Umbrae, Did you ever solve your problems?? What was it? Have the exact same problem now.
Thanks
02 is either bad, wire burnt on the exhaust, 02's not plugged in. If they stay around 450 constantly its b/c the computer is not seeing them.
Email Tunes, [email protected]
96 TA Blown/Stroked, 4L80E/Fab 9
15 C7 A8 H/C 2.3 Blower/PI
14 Gen 5 Viper
Custom Mid Engine chassis, AKA GalBen C
I am having the same problem! Anyone figure this out?
2018 GMC Denali A8 6.2L
2016 CTS-V
2016 C7 Z06 A8
2016 C7 Z06/Z07 A8 vert
2015 Chevy SS 6.2 LS3 A6
1996 Impala SS LT1 CAI
1995 Chevy 1500 5.3 CAI Z06 cam
1957 Chevy vert
Hi,
I think I solved it even though I havn't really tried it for any period of time yet. My problem was totaly different, had a bad connection in one of the pinks going to the driver side injector and coil bank. Made the engine run on 4cyl and this kept throwing different codes and o2 sensors didn't get readings. So my advice is that if you get any other codes persue those first.
Best Regards Axel
Fixed it! Called the guy that made my harness and supplied my pcm. He said I had the wrong O2's. Told me the one's to get and it is working great now!!!
2018 GMC Denali A8 6.2L
2016 CTS-V
2016 C7 Z06 A8
2016 C7 Z06/Z07 A8 vert
2015 Chevy SS 6.2 LS3 A6
1996 Impala SS LT1 CAI
1995 Chevy 1500 5.3 CAI Z06 cam
1957 Chevy vert
Wouldn't happen to be a PSI harness would it?
Email Tunes, [email protected]
96 TA Blown/Stroked, 4L80E/Fab 9
15 C7 A8 H/C 2.3 Blower/PI
14 Gen 5 Viper
Custom Mid Engine chassis, AKA GalBen C
No it is a Speartech.
2018 GMC Denali A8 6.2L
2016 CTS-V
2016 C7 Z06 A8
2016 C7 Z06/Z07 A8 vert
2015 Chevy SS 6.2 LS3 A6
1996 Impala SS LT1 CAI
1995 Chevy 1500 5.3 CAI Z06 cam
1957 Chevy vert
Hi..i have the same promplem.which is the harness promplem?
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