williillii
15+ Year Contributor
- 171
- 1
- Jan 31, 2008
-
Tampa,
Florida
Trying to get my car tuned with a 14b, 550cc/evo ix fuel pump and an safc2 lately, and my wideband has just been confusing me.
Ok so I warm the car up for like 5-10 minutes. o2 is cycling like it should, reading just around 14.7-14.9. Ill take the car out of the neighborhood and do a pull. The first pull will come up at about 13:1 on the wideband. Yikes, right? But it pulls nice and smooth. So I'll do another one just to make sure. This time the afr will hover around 12.5:1. I do a few more pulls and it is slowly reading richer and richer each pull. Eventually it seems to stabilize around 12:1 and will stay there till the car cools down again.
HOWEVER if I beat the ever-loving piss out of the car for like 5 minutes straight (dont ask my why I was doing this with a supposed 12:1afr, I was kinda in a bad mood haha) the afr will keep dropping even more, to about 10.2:1, which makes alot more sense.
What does this seem like to you guys? Does it sound like the sensor? Or somehow the car is getting more fuel the more I beat on it?
I was thinking the sensor was bad but it seems that everyone says they will just read "LEAN" or 5v or whatever when they die. Mine detects open air as AIR, then goes to LEAN when I blow on it. It warms up in a little less than 40 seconds. And its spot on reading my AFR at idle.
So then Im thinking maybe the heater circuit in the sensor/controller is bad. So I pulled it apart, checked for resistance and continuity...all wires on the harness came out to less than 1.2 ohms. The controller is outputting 9v (what it's supposed to) and the sensor gets hot as hell (read: no more fingerprints).
So anyway Im kinda stumped...Im still leaning towards a bad sensor, but is there anything that will make the car run progressively richer and richer the more I beat on it?
Thanks for reading
! Here is a full (relevant) mod list because I know people will ask.
2g head on 1g block
PLX M300 Wideband controller/bosch universal sensor.
14b @ 10psi for troubleshooting purposes
metal intake tube/k&n filter
2.5inch ic piping
front mount
Evo IX OEM Fuel pump w/like 20k miles
wastegate dump tube
2.5inch exhaust
BRAND NEW fuel filter, plugs, wires, fuel pressure regulator
Ok so I warm the car up for like 5-10 minutes. o2 is cycling like it should, reading just around 14.7-14.9. Ill take the car out of the neighborhood and do a pull. The first pull will come up at about 13:1 on the wideband. Yikes, right? But it pulls nice and smooth. So I'll do another one just to make sure. This time the afr will hover around 12.5:1. I do a few more pulls and it is slowly reading richer and richer each pull. Eventually it seems to stabilize around 12:1 and will stay there till the car cools down again.
HOWEVER if I beat the ever-loving piss out of the car for like 5 minutes straight (dont ask my why I was doing this with a supposed 12:1afr, I was kinda in a bad mood haha) the afr will keep dropping even more, to about 10.2:1, which makes alot more sense.
What does this seem like to you guys? Does it sound like the sensor? Or somehow the car is getting more fuel the more I beat on it?
I was thinking the sensor was bad but it seems that everyone says they will just read "LEAN" or 5v or whatever when they die. Mine detects open air as AIR, then goes to LEAN when I blow on it. It warms up in a little less than 40 seconds. And its spot on reading my AFR at idle.
So then Im thinking maybe the heater circuit in the sensor/controller is bad. So I pulled it apart, checked for resistance and continuity...all wires on the harness came out to less than 1.2 ohms. The controller is outputting 9v (what it's supposed to) and the sensor gets hot as hell (read: no more fingerprints).
So anyway Im kinda stumped...Im still leaning towards a bad sensor, but is there anything that will make the car run progressively richer and richer the more I beat on it?
Thanks for reading
! Here is a full (relevant) mod list because I know people will ask.2g head on 1g block
PLX M300 Wideband controller/bosch universal sensor.
14b @ 10psi for troubleshooting purposes
metal intake tube/k&n filter
2.5inch ic piping
front mount
Evo IX OEM Fuel pump w/like 20k miles
wastegate dump tube
2.5inch exhaust
BRAND NEW fuel filter, plugs, wires, fuel pressure regulator
