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03-22-2015, 09:56 AM | #1 |
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N54 exhaust flap fault (not the usual)..
My 35i has lost vacuum to the solenoid/valve in the trunk/boot. It's not the usual exhaust valve failure (which I had once before). This time there's very little vacuum at the valve. Having taken all the trim out to access the solenoid/valve the electrical feed is ok and having removed the vacuum pipe that is in the input side there's very little vacuum. So this means the feed from the engine is faulty. Question is does anyone know where the feed that goes to the back of the car starts in the engine bay so I can further diagnose the issue?
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03-22-2015, 01:49 PM | #2 | |
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2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus.
2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA. |
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03-23-2015, 06:12 AM | #5 |
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I've had some assistance on this from the N54 tech forum. The feed for the exhaust valve is supplied from a T pipe on the brake assist vacuum line (fed by a vacuum pump on the engine). The -ve pressure at the T is significant, but at the feed to the solenoid valve in the boot/trunk there's very little. So there's either a leak or a blockage/kink. I intend to do more work on this next weekend when I have more time. I'll keep you updated in case anyone else gets this on their older e89's.
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07-06-2020, 02:54 PM | #6 |
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Drives: Bmw Z4 35i N54
Join Date: Jul 2020
Location: Italy
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Exhaust valve
Dear
I've a problem with exhaust on my Z4 35i N54, related to the exhaust flap on the original right silencer Two questions: 1) the tube that opens the exhaust valve, work's with vacuum? If so, where does this vacuum form the engine ? 2) with original map, the valve at the exhaust opening when the engine was cold and it was started, valve stay open for a few seconds and then closed, then with the setting SPORT or SPORT + it opened when kick down the gas. Now after I've mapped (387hp) the behavior of the valve at the exhaust has changed, at the start it behaves as before, but going into SPORT or SPORT + the valve opens in release, no in kick down. What may have happened ? is there a parameter in mapping to be fixed? Thank's |
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07-07-2020, 12:00 AM | #7 |
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Just do the "Golf T" mod? Unhook the the vacuum line from solenoid and plug it with something. This leaves the flap always open. it makes a difference in noise low rpm, more crackles and cold starts are pretty loud.
I have been driving with the flap open for years now.
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, Forge DV-s, Masata Chargepipe, KW V3 suspension, M3 front control arms, Hardrace RTABS + balljoints, Michelin Pilot Sport 4S tires.
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07-11-2020, 07:55 AM | #8 | |
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2 After cold start sequence is done, the exhaust flap is always open in 1st and 2nd gear. It then closes in 3rd gear unless you are pushing the throttle more than normal. It opens whenever you start to demand power or when the rpms climb above a certain rpm. The map shouldn't influence the exhaust flap behaviour unless your tuner tried to do some magic. If your tuner tried to alter the exhaust flap behaviour, you better ask him to use the stock one. You cannot use for instance the 1M exhaust flap map on the Z4. If the problem happened right after a map flash, try and let the car sit over night and test again the next day. Mine sometimes wont close right after a flash. |
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07-23-2020, 10:48 AM | #9 | |
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07-23-2020, 01:22 PM | #10 | |
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, Forge DV-s, Masata Chargepipe, KW V3 suspension, M3 front control arms, Hardrace RTABS + balljoints, Michelin Pilot Sport 4S tires.
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07-26-2020, 03:38 AM | #12 |
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Cant take pics right now. Car is in the shop right now. Maybe in a few days i will have it back.
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, Forge DV-s, Masata Chargepipe, KW V3 suspension, M3 front control arms, Hardrace RTABS + balljoints, Michelin Pilot Sport 4S tires.
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