O2 Sensor Question - Values varying widely
Thread Starter
Staging Lane
Joined: Feb 2002
Posts: 78
Likes: 0
From: Pflugerville, TX
O2 Sensor Question - Values varying widely I have been having a fast idle issue with my car for the last couple weeks that is intermittent. So in the process of checking that out I logged some data from my car on my way home from work last week. The thing I noticed that was unusual (I think) is my O2's varying wildly. Below is a small exerpt from the file. Does this look unusual to anyone else? Any ideas what it could be if so? My mods are in my sig.
ECT RPM VSS SPARKADV IAT TP(%) KR FTC O2B1S1 O2B2S1 TPSV
210 912 0 22.5 158 0.4 0 18 74 134 0.59
210 889 0 22 158 0.4 0 18 672 204 0.86
210 1104 2 20 158 2.7 0 4 65 104 0.96
210 1290 11 36 158 0.4 0 4 776 863 0.75
210 1473 12 39 158 1.2 0 4 841 87 0.67
210 1363 11 24 158 0.4 0 4 889 863 0.59
210 907 9 21.5 158 0.4 0 4 78 763 1.22
210 1971 16 38 158 0.4 0 0 711 915 0.57
210 1144 10 22 158 0.4 0 4 880 902 0.59
210 994 2 26.5 158 13.7 0 8 876 906 1.22
210 1873 16 36.5 158 17.6 0 4 78 113 0.57
210 1305 10 22 158 0.4 0 4 885 863 0.59
210 902 5 22 158 14.1 0 8 69 87 1.25
212 1944 16 24.5 158 30.6 7.8 8 828 807 1.82
212 4115 34 34 156 0 0 21 78 160 2.43
212 4044 50 28.5 145 40.4 0 9 763 703 1.04
212 3522 59 37.5 133 19.6 0 5 880 906 0.92
212 3417 58 40 129 2.7 0 1 52 82 0.59
212 2551 55 40.5 126 0 0 1 802 121 0.57
ECT RPM VSS SPARKADV IAT TP(%) KR FTC O2B1S1 O2B2S1 TPSV
210 912 0 22.5 158 0.4 0 18 74 134 0.59
210 889 0 22 158 0.4 0 18 672 204 0.86
210 1104 2 20 158 2.7 0 4 65 104 0.96
210 1290 11 36 158 0.4 0 4 776 863 0.75
210 1473 12 39 158 1.2 0 4 841 87 0.67
210 1363 11 24 158 0.4 0 4 889 863 0.59
210 907 9 21.5 158 0.4 0 4 78 763 1.22
210 1971 16 38 158 0.4 0 0 711 915 0.57
210 1144 10 22 158 0.4 0 4 880 902 0.59
210 994 2 26.5 158 13.7 0 8 876 906 1.22
210 1873 16 36.5 158 17.6 0 4 78 113 0.57
210 1305 10 22 158 0.4 0 4 885 863 0.59
210 902 5 22 158 14.1 0 8 69 87 1.25
212 1944 16 24.5 158 30.6 7.8 8 828 807 1.82
212 4115 34 34 156 0 0 21 78 160 2.43
212 4044 50 28.5 145 40.4 0 9 763 703 1.04
212 3522 59 37.5 133 19.6 0 5 880 906 0.92
212 3417 58 40 129 2.7 0 1 52 82 0.59
212 2551 55 40.5 126 0 0 1 802 121 0.57
Re: O2 Sensor Question - Values varying widely Yep Magnus got it. Unless your at WOT they are going to be all the over the place as load conditions are ever changing etc....At WOT they should hold around 890-915 or so, but they are to be used in loose translation only.
You have the EGR mod, check for a vacuum leak around the egr fiting at the manifold. Also, with the cam and not having tuning, you will get that as the IAC motor is trying to compensate for idle quality.
Just a few thoughts on it.
Charlie.
You have the EGR mod, check for a vacuum leak around the egr fiting at the manifold. Also, with the cam and not having tuning, you will get that as the IAC motor is trying to compensate for idle quality.
Just a few thoughts on it.
Charlie.
Thread Starter
Staging Lane
Joined: Feb 2002
Posts: 78
Likes: 0
From: Pflugerville, TX
Re: O2 Sensor Question - Values varying widely Thanks for the input guys. But the car is tuned, Jayson at MTI did the tune. My idle problem has only been for the last 3 weeks or so. It's very inconsistent.
