partial log file inside, wierd 02 voltage numbers
partial log file inside, wierd 02 voltage numbers can anyone help or tell me why the o2 voltages would vary like this, its a wot run from 30 to 100,
946 920
942 911
929 898
933 907
938 903
933 898
942 894
942 898
942 894
946 890
942 885
938 881
942 872
946 868
946 864
938 859
942 859
938 846
946 838
942 838
933 833
933 825
938 820
942 807
938 803
942 790
942 790
946 786
946 781
955 777
955 786
955 790
951 790
951 803
951 790
955 786
951 790
946 786
946 786
946 790
946 781
946 777
946 777
942 781
946 773
942 768
942 768
946 773
929 768
942 755
929 760
942 751
929 751
938 742
929 734
933 725
933 716
929 703
933 699
938 686
929 677
924 668
929 660
933 651
929 647
924 634
916 634
920 625
920 616
916 608
924 599
920 590
920 577
911 573
907 564
907 556
911 560
911 547
916 543
911 538
898 530
907 521
907 516
916 516
903 521
903 503
907 503
903 499
907 495
894 495
907 486
907 486
898 482
907 477
898 477
903 473
898 469
890 473
903 460
894 464
898 460
903 456
890 456
898 451
898 447
898 443
894 447
885 443
890 438
894 434
898 425
894 421
890 425
890 425
894 417
890 417
885 417
881 412
881 412
885 408
881 404
885 395
885 399
885 399
894 399
898 399
898 395
894 395
890 395
890 391
894 382
885 382
881 386
890 382
890 378
885 382
885 373
890 373
885 373
881 369
890 365
872 356
946 920
942 911
929 898
933 907
938 903
933 898
942 894
942 898
942 894
946 890
942 885
938 881
942 872
946 868
946 864
938 859
942 859
938 846
946 838
942 838
933 833
933 825
938 820
942 807
938 803
942 790
942 790
946 786
946 781
955 777
955 786
955 790
951 790
951 803
951 790
955 786
951 790
946 786
946 786
946 790
946 781
946 777
946 777
942 781
946 773
942 768
942 768
946 773
929 768
942 755
929 760
942 751
929 751
938 742
929 734
933 725
933 716
929 703
933 699
938 686
929 677
924 668
929 660
933 651
929 647
924 634
916 634
920 625
920 616
916 608
924 599
920 590
920 577
911 573
907 564
907 556
911 560
911 547
916 543
911 538
898 530
907 521
907 516
916 516
903 521
903 503
907 503
903 499
907 495
894 495
907 486
907 486
898 482
907 477
898 477
903 473
898 469
890 473
903 460
894 464
898 460
903 456
890 456
898 451
898 447
898 443
894 447
885 443
890 438
894 434
898 425
894 421
890 425
890 425
894 417
890 417
885 417
881 412
881 412
885 408
881 404
885 395
885 399
885 399
894 399
898 399
898 395
894 395
890 395
890 391
894 382
885 382
881 386
890 382
890 378
885 382
885 373
890 373
885 373
881 369
890 365
872 356
could be a bad o2 sensor, i would do any more wot runs from the looks of those numbers though, even the left side looks like it starts to go lean, i would switch the o2s over and see if the problem switches banks, if it does then get 2 new o2s
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
how do the O2s look during normal driving? Do they both switch pretty decently? (high low high low)
also if you could post the RPM along with those O2s (was it a 3rd gear pull? or did you go 2nd to 3rd?)
Even the O2 that's working (or appears to be) correctly seems to drop off by the top end (heavy load and high RPM) ...
also if you could post the RPM along with those O2s (was it a 3rd gear pull? or did you go 2nd to 3rd?)
Even the O2 that's working (or appears to be) correctly seems to drop off by the top end (heavy load and high RPM) ...
this was a 1st, 2nd gear run,
what site will let me host other items than pics, photobucket wont allow me to upload it.
there is to much info to copy and paste, i need to find a site.
what site will let me host other items than pics, photobucket wont allow me to upload it.
there is to much info to copy and paste, i need to find a site.
It looks to me like you have a bad fuel fade on one side,
starts off fairly well matched and degrades with RPM
(RPM = fuel flow). I would suspect either something bad
in the pulse damper restricting flow to the passenger's
side, or a single injector that is crusty. Look at the misfire
current cylinder values on a similar run-up, all 8, and see
if you can distinguish a bankwise (2,4,6,8 > 1,3,5,7) or
single cylinder problem. If it's B2 that's weak and it's
uniform with respect to misfires then I'd gut the damper.
Otherwise I expect a single wimp injector is more probable.
Also don't discount spark misfire which can also blow fresh
air into the exhaust along with the fuel.
starts off fairly well matched and degrades with RPM
(RPM = fuel flow). I would suspect either something bad
in the pulse damper restricting flow to the passenger's
side, or a single injector that is crusty. Look at the misfire
current cylinder values on a similar run-up, all 8, and see
if you can distinguish a bankwise (2,4,6,8 > 1,3,5,7) or
single cylinder problem. If it's B2 that's weak and it's
uniform with respect to misfires then I'd gut the damper.
Otherwise I expect a single wimp injector is more probable.
Also don't discount spark misfire which can also blow fresh
air into the exhaust along with the fuel.
