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03-01-2015, 07:17 PM | #1 |
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my bmw 135i only one exhaust pipe working when cold start
Is this normal? Normally the one close to passenger side (the car has dual pipe on driver side)working first, after 1 minute the other one close to driver side started to work. Sometimes you can hear some metal sound then the other one is working.
any ideas? thanks in advance! |
03-01-2015, 08:42 PM | #3 |
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Fritz, again. We went around and around about this on UUC many years ago trying to understand if this was an emissions thing, some sort of performance thing we weren't smart enough to understand, or just an exhaust note/volume thing. Operating parameters if the newer motors are way different than they were 15+years ago, and so who knows. My old E36 had the line disconnected with a screw in it for 15 years. My E82 is as-is from the factory, and I'll agree it sounds odd at start-up. This time around, I'll blame it on Fritz and leave it.
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03-02-2015, 12:10 AM | #5 |
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It's a flap that only opens up above 3k RPM. If you pull out the bit of trunk liner behind the driver side tail light and then pull back the liner next to it, you will find a couple wires with a plug you can undo. That keeps the flap open all the time. It's just a noise thing.
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03-02-2015, 12:57 PM | #6 | |
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Quote:
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E46 M3 ---> AW 135i on Coral Red - JB4 w/MHD Backend - Alpina B3 - Koni Yellows - H&R Super Sport Springs - Powerflex Rear Upper Shock Mounts - ///M Strut Tower Bar
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