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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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12-11-2011, 08:45 AM
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#1 |
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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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 D2 Racing Sport Suspension ~ aFe CAI ~ AA Tune ~ Orion AEs ~ Topspeed Exhaust ~ Euro Headers ~ UUC SSK Evo 3 and DSSR ~ 15% Tint Windows and 50% Windshield |
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12-11-2011, 11:47 AM
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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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12-13-2011, 05:19 PM
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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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D2 Racing Sport Suspension ~ aFe CAI ~ AA Tune ~ Orion AEs ~ Topspeed Exhaust ~ Euro Headers ~ UUC SSK Evo 3 and DSSR ~ 15% Tint Windows and 50% Windshield |
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12-13-2011, 10:20 PM
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weird
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12-15-2011, 08:05 AM
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Check for exhaust leaks and vacuum leaks. Good luck
Sent from my DROIDX using Bimmer
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12-23-2011, 03:19 AM
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Registered User
Join Date: Dec 2010
Location: Baltimore, MD/DC
Posts: 629
My Ride: is finally boosted
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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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