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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 12-11-2011, 08:45 AM   #1
jordangreen21
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O2 sensor problem

So I had catless headers and everything was fine but I am about to sell my car so I put the stock headers back on. After installing them and putting all the o2 sensor back in the car is running like ****. I've heard having the sensors in wrong can cause this to happen. Any help would be appreciated. Thank you
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Old 12-11-2011, 11:47 AM   #2
trippmann
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yeah you probably have the sensors in the wrong bungs. swap your precat connectors and see if it helps. the postcats usually dont have much to with performance its more about emissions.
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Old 12-13-2011, 05:19 PM   #3
jordangreen21
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switched em around and it worked but for some reason I am getting a slightly rough idle.
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Old 12-13-2011, 10:20 PM   #4
darksideracer69
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weird
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Old 12-15-2011, 08:05 AM   #5
trippmann
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Check for exhaust leaks and vacuum leaks. Good luck

Sent from my DROIDX using Bimmer
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Old 12-23-2011, 03:19 AM   #6
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yeah the idle problem is probably from exhaust leaks at the oem manifolds not being bolted up all the way tight or maybe a bad gasket. could be header to exhaust flange too
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