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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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05-09-2013, 12:43 PM | #15 | |
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.. some of the 32bit wrx's have similar issues even with the 02 checks turned off in the rom... hope that is not the issue... resistor packs did not solve the problem for them.
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05-09-2013, 12:47 PM | #16 | ||
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The Following User Says Thank You to mad_sb For This Useful Post: | SkullWorks (05-09-2013) |
05-09-2013, 02:52 PM | #17 |
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Should still be able to disable cels..... Mine and a friends 11 wrx's both ran catless and with multiple tuning solutions disabled the o2 cel.
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The Following User Says Thank You to StormTrooper For This Useful Post: | mad_sb (05-09-2013) |
05-09-2013, 03:57 PM | #18 | |
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@DJCarbine did you pull the codes yet just to be sure they are not unrealted? Code numbers might also help the tuner know exactly what needs to be disabled.
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05-09-2013, 05:47 PM | #19 | |
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I know there is a bunch of talk in the subaru community about removal/relocation of the rear O2 sensor causing strange fueling issues, but I saw a thread on here where a member disproved this. The subaru guys seem fairly convinced that newer Denso ECUs do NOT like the rear O2 disconnected/moved out of the exhaust stream. The codes are for O2 sensor heater circuit and no sensor activity from what I remember.... I will double check and grab the exact DTCs in an hour or so when I get home. If all else fails, I can just run the Innovate narrowband output to the ECU, but I wanted to avoid splicing into the factory harness |
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05-09-2013, 06:06 PM | #20 |
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You're going to need to talk to your tuner either way.
Disabling the CEL for low catalyst efficiency (which most tunes do in order to work with aftermarket headers/cat removal) does not disable the codes that will be thrown when the sensor is missing all together. |
05-09-2013, 06:16 PM | #21 | |
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However, the secondary is just a switching O2 sensor, so as long as it reads leaner than the primary it should be fine. I will do testing tonight and report back |
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05-09-2013, 06:22 PM | #22 |
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this seems on point with my thoughts.
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05-09-2013, 07:16 PM | #23 |
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So with an ECUtek tune and no secondary O2, the car is actually in closed loop.
The ONLY DTC code was for an open O2 heater circuit, nothing else. I have my O2 sensor plugged in and ziptied out of the way for now to get rid of the CEL. I am going to look into fooling the ECU with a high watt resistor for the heater circuit so I can get rid of the second sensor completely. AFR target is 14.7 at idle, and I was hitting that.... I need to recalibrate my wideband, as it is reading off from the factory wideband |
05-09-2013, 07:37 PM | #24 | |
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05-09-2013, 07:39 PM | #25 |
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We left the sensors plugged in just deleted the cel.
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05-09-2013, 11:03 PM | #26 |
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Just ordered a 6ohm 50watt resistor. Its got an aluminum body with small heat fins. I am going to try that.
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05-10-2013, 09:06 AM | #27 |
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Do you have a catted midpipe? maybe buy longer cables and go around that cat vice the header one??
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05-10-2013, 09:29 AM | #28 | |
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The resistor should do the trick, service manual says the heater circuit resistance is between 5 and 7 ohms or thereabouts. 6 ohms should trick the ECU |
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