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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 07-21-2019, 08:16 PM   #29
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I think you've damage the o2 sensor while changing the exhaust, they can be very sensitive, with a slight knock they can be faulty. but still doesn't explain why the car shuts off right away since you can run fine with only one.
long shot but are all the grounds connected? have you accidentally swapped any plugs, or accidentally have the o2 sensors cables swapped around ?
i did think that i accidentally swapped the o2 sensors as well so when i tried to switch them, one of the sensors wasnt even long enough to connect to the harness so my guess is i have them installed the right way
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Old 07-21-2019, 08:18 PM   #30
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i dont have the tester but will get one tomorrow and see if they are actually bad
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Old 07-21-2019, 08:33 PM   #31
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i did think that i accidentally swapped the o2 sensors as well so when i tried to switch them, one of the sensors wasnt even long enough to connect to the harness so my guess is i have them installed the right way
Could be another long shot, but have you tried putting the oem headers and fp back on and then turning the car back on ? when i swapped out my exhaust i only did the cat back and ran like that for a week or two so the ecu can adjust properly, maybe having too much change all of a sudden could be upsetting the ecu ?? i know you can swap the entire thing out and should run perfect right away but something seems to be upsetting the ecu?
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Old 07-21-2019, 08:43 PM   #32
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Could be another long shot, but have you tried putting the oem headers and fp back on and then turning the car back on ? when i swapped out my exhaust i only did the cat back and ran like that for a week or two so the ecu can adjust properly, maybe having too much change all of a sudden could be upsetting the ecu ?? i know you can swap the entire thing out and should run perfect right away but something seems to be upsetting the ecu?
thats also a possibility and will try that out tomorrow and see. who knows
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Old 07-21-2019, 09:14 PM   #33
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I wonder if this isn't the result of using the wrong kind of anti-seize. They say it destroys o2 sensors.

If this is really a thing, I wonder how much it takes. Just spitballing here.
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Old 07-21-2019, 11:57 PM   #34
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I wonder if this isn't the result of using the wrong kind of anti-seize. They say it destroys o2 sensors.

If this is really a thing, I wonder how much it takes. Just spitballing here.
ive never heard of that but i did use the anti sieze that came from tomei with my headers
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Old 07-22-2019, 12:07 AM   #35
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ive never heard of that but i did use the anti sieze that came from tomei with my headers
That totally negates my concern. I think that particularly the copper stuff does something weird when it heats up and vaporizes.
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