ShadowTalon
10+ Year Contributor
- 88
- 0
- Apr 19, 2012
-
Bayamon,
Puerto Rico
Just installed an MTX-L wideband in the front o2 sensor area. I unplugged and removed the original o2 sensor since I'll just remove the CEL with ecu tuning.
When I start the car it idles very rough and almost dies and the A/F readings are very lean (17+). Sometimes it actually does die and I have to start it again. At WOT it reads about 10.1 (rich I know but the reason for the wideband is so I can finally tune for my mods).
My Afpr reads around 39psi while it is idling. It seems like the ecu is adding and cutting fuel but the strange part is after about 3-5 minutes of idle the A/F readings jump to 13.8-14.7 and it starts to idle fine.
I ran the brown wire to pin 76 on the ecu but have the gauge sharing a ground with my boost/oil pressure gauge. Would this cause an issue? I DID unbolt the DP to do the install so I'll check for exhaust leaks tomorrow. Would an exhaust leak cause this?
[Solved] READ: I thought it important to update this for those that may have a similar issue. There was no problem with my wideband or any exhaust leaks. The issue was my half-a$$ed install.
You see, I figured since I already had a boost gauge and and oil pressure gauge installed that I could just tap into the same power and ground from those. BIG NO NO! The install pages even tell you this. First I had an E9 (low voltage error) so I switched the power and tapped from the blue cigarette lighter wire. This at least let the gauge work correctly but I would sometimes get a flash of the E9 code again on startup. The real problem was what I already stated above. Turns out the wideband gauge REALLY needs it's own power AND ground source. I ran the wire to a screw on the frame after having sanded the area down to the metal and now I have no problems with the wideband maintaining the normal idle AFRs.
Lesson learned: Do things right the first time and avoid these issues. There really isn't an "easy" way with DSMs
.
When I start the car it idles very rough and almost dies and the A/F readings are very lean (17+). Sometimes it actually does die and I have to start it again. At WOT it reads about 10.1 (rich I know but the reason for the wideband is so I can finally tune for my mods).
My Afpr reads around 39psi while it is idling. It seems like the ecu is adding and cutting fuel but the strange part is after about 3-5 minutes of idle the A/F readings jump to 13.8-14.7 and it starts to idle fine.
I ran the brown wire to pin 76 on the ecu but have the gauge sharing a ground with my boost/oil pressure gauge. Would this cause an issue? I DID unbolt the DP to do the install so I'll check for exhaust leaks tomorrow. Would an exhaust leak cause this?
[Solved] READ: I thought it important to update this for those that may have a similar issue. There was no problem with my wideband or any exhaust leaks. The issue was my half-a$$ed install.
You see, I figured since I already had a boost gauge and and oil pressure gauge installed that I could just tap into the same power and ground from those. BIG NO NO! The install pages even tell you this. First I had an E9 (low voltage error) so I switched the power and tapped from the blue cigarette lighter wire. This at least let the gauge work correctly but I would sometimes get a flash of the E9 code again on startup. The real problem was what I already stated above. Turns out the wideband gauge REALLY needs it's own power AND ground source. I ran the wire to a screw on the frame after having sanded the area down to the metal and now I have no problems with the wideband maintaining the normal idle AFRs.
Lesson learned: Do things right the first time and avoid these issues. There really isn't an "easy" way with DSMs
.
Last edited:
