#N54 Muffler

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New Post has been published on https://www.vividracing.com/blog/building-a-650-horsepower-bmw-n54-engine/

Building a 650 Horsepower BMW N54 Engine

Known for its performance, engineering, and widespread adoption among Bimmer enthusiasts, the N54 engine marked a significant milestone in BMW’s history. The N54 engine was introduced by BMW in 2006 and was produced until 2016 most notably in cars like the 135i Coupe and Convertible (E82/E88), 335i Coupe, Convertible, Sedan, and Wagon (E90/E91/E92/E93), 535i Sedan and Wagon (E60/E61), and the Z4 sDrive35i (E89). This engine really marked BMW’s return to turbocharging in a production inline-six engine. The N54 is a 3.0-liter inline-six engine featuring twin turbo’s. The use of twin turbos helps the engine deliver strong low-end torque and impressive horsepower output across the rpm range. The N54 was one of the first BMW engines to feature direct fuel injection. To support direct injection, the N54 engine features a high-pressure fuel system capable of delivering fuel at pressures of up to 2900 psi (200 bar for the non Americans). The N54 also incorporates BMW’s VANOS system for both the intake and exhaust camshafts. This variable valve timing technology allows for precise control over valve timing, optimizing engine performance, responsiveness, and fuel efficiency. Like a lot of current BMW engines, the N54 features an aluminum block and cylinder head, which helps reduce weight while maintaining structural integrity and heat dissipation properties, but be careful of overheating, because once that aluminum warps, there’s no going back.

From the factory, the N54 makes around 300 to 335 horsepower (depending on the application), and torque ranging from 300 to 370 lb-ft. These numbers make it a popular platform for BMW boys who want to build it to the moon. The N54 has gotten a significant following because of its potential for significant power gains with relatively simple bolt ons. So let’s talk about these bolt on’s and how to bring the N54 for 650 horsepower using parts sold on our website!

1.) Charge Pipe and Blow Off Valve

First is going to be an aluminum charge pipe with a blow off valve, from brands Active Autowerks, CTS turbo, and Vargas

An upgraded aluminum charge pipe has more durability than the stock plastic that comes in cars with N54’s. It also allows for improved airflow, and better heat dissipation, making them perfect for forced induction setups. Their ability to withstand higher boost pressures and reduce turbulence improves performance and reliability, while also looking so much better than plastic.

Installing a blow-off valve on an N54 can help maintain consistent boost pressure and protect the turbo’s from damage. When the throttle plate closes suddenly, such as during gear shifts or when lifting off the accelerator, the compressed air trapped in the charge pipes can create a pressure wave. A blow-off valve releases this excess pressure, preventing it from damaging the turbo’s and ensuring smoother performance and longevity of the turbocharged system.

Charge Pipe Links:

Active- https://www.vividracing.com/active-autowerke-aluminum-chargepipe-bov-bmw-e9x-n54-335-p-152651390.html CTS Turbo- https://www.vividracing.com/cts-turbo-bov-pipe-with-tial-flange-bmw-e90-335i-sedan-n54-0710-p-151347356.html VTT- https://www.vividracing.com/vtt-single-piece-silicone-cold-side-charge-pipe-hks-bmw-biturbo-20062018-p-155987926.html

BOV Links: Turbo Smart- https://www.vividracing.com/turbosmart-turbosmart-bov-race-port-platinum-p-155955365.html HKS- https://www.vividracing.com/hks-sqv4-universal-super-sequential-blow-off-valve-kit-p-152792157.html

  2.) Cold Air Intake

Second is going to be a cold air intake from brands like Burger Motorsports, AFE, and GruppeM

Adding a cold air intake to the N54 engine will increase airflow, giving it improved performance and a way better sound. By reducing the temperature of the air going in to your engine, it enhances efficiency and potentially fuel economy. A cold air intake is a fairly easy upgrade to install, making it a great choice for people just wanting to get their feet wet, or have sick induction noises.

Cold Air Intake Links:

Injen- https://www.vividracing.com/injen-short-ram-air-intake-system-p-152403547.html AFE- https://www.vividracing.com/afe-power-magnum-force-stage2-cold-air-intake-system-pro-dry-media-bmw-335i-e90e92e93-30l-0710-p-59521.html GruppeM- https://www.vividracing.com/gruppem-carbon-fiber-ram-air-intake-system-bmw-335i-e90e91e92e93-0610-p-74298.html

3.) Fuel Pump

Next is an upgraded fuel pump, from brands like Vargas

Upgrading the fuel system in an N54  is crucial if you’re wanting to gain more horsepower and have a higher torque output, especially when running higher boost or using aftermarket turbos. A stronger fuel system ensures the right amount of fuel delivery to meet the engine’s increased demand, preventing it from fuel starvation and potential engine damage. Upgrading your fuel system can also allow for more precise tuning, maximizing the engine’s potential performance while maintaining reliability.

Fuel Pump Links:

Vargas- https://www.vividracing.com/vtt-pfs-bucketless-double-shot-fuel-pump-upgrade-p-155988100.html

  4.) Front Mounted Intercooler

After that is a front mounted intercooler, from brands like Wagner, Forge motorsports, and Evolution racewerks

Upgrading the intercooler for an N54 gives you better cooling efficiency. It reduces intake air temperatures for increased power output and improved throttle response. It also helps prevent heat soak during hard driving, giving you consistent power. An upgraded intercooler also helps when you add other modifications to your engine.

Intercooler Links:

Wagner- https://www.vividracing.com/wagner-tuning-intercooler-kit-competition-bmw-e82-e90-evo3-20062013-p-155056621.html Forge- https://www.vividracing.com/forge-motorsport-front-mount-intercooler-kit-bmw-335i-335ix-e9x-20072010-p-151839030.html Evolution- https://www.vividracing.com/evolution-racewerks-competition-polished-finish-full-front-mount-intercooler-kit-bmw-335i-n54-0508-p-151452238.html

  5.) Upgraded Turbo

Then a turbo upgrade from Brands like The Turbo Engineers, Vargas, and CTS Turbo

Upgrading to twin turbos on an N54 engine can significantly increase power potential. This is the key ingredient to getting up to 650 Horsepower. The stock turbo’s on an N54 can hold up to around 400 horsepower before blowing themselves up, so upgrading them will be a necessity to seeing higher horsepower gains. Upgrading your turbos also gives the engine better responsiveness and torque delivery throughout the RPM range, resulting in you having more fun.

Turbo Upgrade Links:

TTE- https://www.vividracing.com/tte-turbo-new-tte600-n54-upgrade-turbocharger-bmw-135i-lhd-20072011-p-153639504.html Vargas- https://www.vividracing.com/vtt-n54-stage-rhd-titaniumfits-all-n54-models-lhdrhd-p-155987572.html CTS- https://www.vividracing.com/cts-turbo-stage-turbo-upgrade-bmw-335i-20072011-p-155962671.html

And finally you’ll need a tune to wrap it all up and make sure everything works.

Tuning the N54 after installing upgraded turbos, a new fuel system, a cold air intake, an upgraded intercooler, and a charge pipe is crucial to optimizing performance and making engine operates safely. A custom tune allows for proper calibration of the engine’s air-fuel ratio, ignition timing, boost levels, and fuel delivery, allowing you to maximize power and drivability while making sure a piston doesn’t go flying out of your hood.

Overall, the N54 is an amazing engine, and it’s popular for a reason. Now, all of these parts are just suggestions. There are plenty of other ways to build an N54 and get upwards of 500 horsepower! If you have an N54 in your car and you’re looking for these parts or other parts, don’t hesitate to reach out! We would love to talk to you.

You can either email us at Sales@vividracing.com, or if you like human interaction, give us a call at +1 (480) 966-3040

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2010-2020 BMW 535i Technical Service Bulletin # 180112 Date: 120901

2010-2020 BMW 535i Technical Service Bulletin # 180112 Date: 120901 Exhaust System - Rattle Noise From Tail Pipe Upon Start Up SI B18 01 12 Exhaust Systems September 2012 Technical Service SUBJECT Rear Muffler Exhaust Flap Diagnosis MODEL All models with the N54, N54T or N55 engine SITUATION A rattling noise is heard from the exhaust tail pipe during start-up. The noise can last up to sixty seconds. CAUSE Insufficient vacuum to hold the exhaust flap shut Note: 2010-2020 BMW 535i Sedan (E60) L6-3.0L Turbo (N54) Page 25 There will be an audible one-time click from the exhaust flap when it opens or closes. This is a normal function of the exhaust flap. PROCEDURE Recommended parts needed for diagnosis (all reusable): 10cm of vacuum line (P/N 11 72 7 545 323) One meter of vacuum line (P/N 11 72 7 545 323) Vacuum line T-fitting (P/N 11 72 1 439 973) Vacuum line straight fitting (P/N 11 72 1 803 012) 1. Remove the vacuum line at the exhaust flap actuator. Install the 10 cm section of test hose with the T-fitting (1). Connect the one-meter section of hose to the open port in the T-fitting. 2. Connect the other end of the one-meter vacuum test line to the pressure port (1) on top of the IMIB. 3. Select the Low Pressure 1 setting from the Multimeter menu section of the IMIB. 2010-2020 BMW 535i Sedan (E60) L6-3.0L Turbo (N54) Page 26 If the engine is cold: The DME will actuate the exhaust flap for approximately 60 seconds once the engine is started. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the engine is at operating temperature: The exhaust flap can also be actuated manually through the ISID. Follow the necessary steps in test plan "B1214_TVD_AGK - Exhaust flap." The exhaust flap actuates for approximately 30 seconds during the test. The engine needs to be shut off and restarted during each test attempt. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the reading is higher than 0.3 bar: 1. Isolate the exhaust flap actuator by splicing in the straight adapter fitting (1). 2. Check the vacuum again at the IMIB (the engine is running cold or through the ISID with the engine at operating temp). 3. If the reading is now within spec (0.3 bar or lower), the diaphragm in the exhaust flap actuator is the source of the leak and the rear muffler with the flap will need to be replaced. 4. If the vacuum reading at the IMIB is still high, then the vacuum line, vacuum source or electrical solenoid/wiring will need to be checked to find the cause of the high reading. from Blogger https://ift.tt/3jEyO7f

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Disclaimer2010-2020 BMW 535i Technical Service Bulletin # 122008 Date: 090801

Disclaimer2010-2020 BMW 535i Technical Service Bulletin # 122008 Date: 090801 Engine Controls - Aftermarket Tuning Kit Information SI B 12 20 08 Engine Electrical Systems August 2009 Technical Service This Service Information bulletin supersedes SI B12 20 08 dated June 2008. [NEW] designates changes to this revision SUBJECT N54 - Various Complaints Caused by Aftermarket "Tuning Kits" E90, E92, E93 with N54 engine E60, E61 with N54 engine E82, E88 with N54 engine E71 with N54 engine SITUATION I The customer may complain about an excessive muffler noise; "backfiring" into the intake manifold; high (increased) engine oil/fuel consumption; illumination of the "Service Engine Soon Light"; or an excessive battery draw. [NEW] Fault codes 2D18 or 2D25, "Manipulation protection, max air mass", may be stored in the DME, indicating an implausible airflow. To prevent possible engine mechanical damage due to increased turbocharging pressure, the DME will limit the maximum available torque to the nominal torque value of 400Nm. SITUATION II The customer may complain that the vehicle couldn't pass the state emissions inspection, where scanning of the OBD readiness codes is part of the inspection procedure. The GT1/DIS or aftermarket testing equipment indicates that the EVAP system is a "not supported" function of the vehicle's OBD control system. Also, various complaints regarding the cruise control being inactive; the battery draw message displayed in the Control Display; or incorrect muffler flap operation may be encountered. CAUSE I An aftermarket engine performance tuning kit, "turbo-tuner control module" (piggyback box), is (or was) installed in the vehicle. Depending on the manufacturer, these modules are plugged directly into the TMAP (Temperature I Manifold Ambient Pressure) sensor or into the DME harness in the E-box. The modified (erroneous) air intake pressure signal supplied to the DME causes an increased turbo boost. In some cases, these modifications also include alteration to the waste-gate vacuum plumbing, which may cause various vacuum supply problems. 2010-2020 BMW 535i Sedan (E60) L6-3.0L Turbo (N54) Page 318 CAUSE II The vehicle's DME was reprogrammed with an aftermarket "N54 performance software calibration". As a result, various DME OBD II-relevant diagnostic functions are inoperative, or their functionalities are limited. Examples include diagnostic of the purge system; map-cooling thermostat; engine temperature sensor; oxygen sensors; and the functionality of the evaporation system and exhaust flaps. INFORMATION With the integration level of E89X-08-03-530 or higher (introduced with Progman V29.02.00), any alteration to the TMAP sensor signal ("piggyback box") is detected by setting the DME fault codes [NEW] 2D25/2D18 ("Manipulation protection, max air mass signal plausibility"). In such a case, the maximum engine torque cannot exceed 400 Nm. Aftermarket N54 DME software modifications usually do not change either programmed or basic DME part numbers, so it is not possible to identify this alteration via DME identification pages. In certain cases, the MSD8O DME software modifications can be detected by executing test module "S1214 NG6OBDII/Read codes" (reading of the OBD readiness codes). If the readiness code for the "Fuel Tank Ventilation" shows "XXX" (instead of "yes" or "no"), this is an indication that evaporation system function is not supported by the DME and the original BMW software was altered. (In this situation, when using the aftermarket scanning tool for checking readiness monitors, the Evaporation System status would be displayed as "Not Supported".) In such a case, the vehicle is not compliant with the federal (EPA) and state (CARB) emissions anti-tampering laws. Any repair or diagnostic cost incurred by a component and/or system failure as a result of an "N54 aftermarket engine tuning kit" installation is not covered by the terms of the BMW New Vehicle Limited Warranty. Moreover, modification of the vehicle or installation of any non-approved performance accessories or components attached to the vehicle, which alters the original engineering and/or operating specifications, or which results in damage to the other original components, voids the warranty coverage on the affected original Drivetrain and Emission Control components. In general terms, the BMW warranty on Drivetrain and Emission Control components is void due to a modification where the modification, alteration or installation of a non-approved aftermarket part was responsible for the failure. Please make sure to inform BMW customers considering the purchase of an aftermarket "N54 Engine Tuning" kit of the above legal, technical and warranty implications. from Blogger https://ift.tt/31yZeAU

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2010-2020 BMW 335i Technical Service Bulletin # 180112 Date: 120901

2010-2020 BMW 335i Technical Service Bulletin # 180112 Date: 120901 Exhaust System - Rattle Noise From Tail Pipe Upon Start Up SI B18 01 12 Exhaust Systems September 2012 Technical Service SUBJECT Rear Muffler Exhaust Flap Diagnosis MODEL All models with the N54, N54T or N55 engine SITUATION A rattling noise is heard from the exhaust tail pipe during start-up. The noise can last up to sixty seconds. CAUSE Insufficient vacuum to hold the exhaust flap shut Note: 2010-2020 BMW 335i Sedan (E90) L6-3.0L Turbo (N54) Page 29 There will be an audible one-time click from the exhaust flap when it opens or closes. This is a normal function of the exhaust flap. PROCEDURE Recommended parts needed for diagnosis (all reusable): 10cm of vacuum line (P/N 11 72 7 545 323) One meter of vacuum line (P/N 11 72 7 545 323) Vacuum line T-fitting (P/N 11 72 1 439 973) Vacuum line straight fitting (P/N 11 72 1 803 012) 1. Remove the vacuum line at the exhaust flap actuator. Install the 10 cm section of test hose with the T-fitting (1). Connect the one-meter section of hose to the open port in the T-fitting. 2. Connect the other end of the one-meter vacuum test line to the pressure port (1) on top of the IMIB. 3. Select the Low Pressure 1 setting from the Multimeter menu section of the IMIB. 2010-2020 BMW 335i Sedan (E90) L6-3.0L Turbo (N54) Page 30 If the engine is cold: The DME will actuate the exhaust flap for approximately 60 seconds once the engine is started. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the engine is at operating temperature: The exhaust flap can also be actuated manually through the ISID. Follow the necessary steps in test plan "B1214_TVD_AGK - Exhaust flap." The exhaust flap actuates for approximately 30 seconds during the test. The engine needs to be shut off and restarted during each test attempt. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the reading is higher than 0.3 bar: 1. Isolate the exhaust flap actuator by splicing in the straight adapter fitting (1). 2. Check the vacuum again at the IMIB (the engine is running cold or through the ISID with the engine at operating temp). 3. If the reading is now within spec (0.3 bar or lower), the diaphragm in the exhaust flap actuator is the source of the leak and the rear muffler with the flap will need to be replaced. 4. If the vacuum reading at the IMIB is still high, then the vacuum line, vacuum source or electrical solenoid/wiring will need to be checked to find the cause of the high reading. from Blogger https://ift.tt/2DFmzrS

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2010-2020 BMW 135i Technical Service Bulletin # 180112 Date: 120901

2010-2020 BMW 135i Technical Service Bulletin # 180112 Date: 120901 Exhaust System - Rattle Noise From Tail Pipe Upon Start Up SI B18 01 12 Exhaust Systems September 2012 Technical Service SUBJECT Rear Muffler Exhaust Flap Diagnosis MODEL All models with the N54, N54T or N55 engine SITUATION A rattling noise is heard from the exhaust tail pipe during start-up. The noise can last up to sixty seconds. CAUSE Insufficient vacuum to hold the exhaust flap shut Note: 2010-2020 BMW 135i Convertible (E88) L6-3.0L Turbo (N54) Page 31 There will be an audible one-time click from the exhaust flap when it opens or closes. This is a normal function of the exhaust flap. PROCEDURE Recommended parts needed for diagnosis (all reusable): 10cm of vacuum line (P/N 11 72 7 545 323) One meter of vacuum line (P/N 11 72 7 545 323) Vacuum line T-fitting (P/N 11 72 1 439 973) Vacuum line straight fitting (P/N 11 72 1 803 012) 1. Remove the vacuum line at the exhaust flap actuator. Install the 10 cm section of test hose with the T-fitting (1). Connect the one-meter section of hose to the open port in the T-fitting. 2. Connect the other end of the one-meter vacuum test line to the pressure port (1) on top of the IMIB. 3. Select the Low Pressure 1 setting from the Multimeter menu section of the IMIB. 2010-2020 BMW 135i Convertible (E88) L6-3.0L Turbo (N54) Page 32 If the engine is cold: The DME will actuate the exhaust flap for approximately 60 seconds once the engine is started. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the engine is at operating temperature: The exhaust flap can also be actuated manually through the ISID. Follow the necessary steps in test plan "B1214_TVD_AGK - Exhaust flap." The exhaust flap actuates for approximately 30 seconds during the test. The engine needs to be shut off and restarted during each test attempt. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the reading is higher than 0.3 bar: 1. Isolate the exhaust flap actuator by splicing in the straight adapter fitting (1). 2. Check the vacuum again at the IMIB (the engine is running cold or through the ISID with the engine at operating temp). 3. If the reading is now within spec (0.3 bar or lower), the diaphragm in the exhaust flap actuator is the source of the leak and the rear muffler with the flap will need to be replaced. 4. If the vacuum reading at the IMIB is still high, then the vacuum line, vacuum source or electrical solenoid/wiring will need to be checked to find the cause of the high reading. from Blogger https://ift.tt/2ZtkNlx

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2010-2020 BMW Z4 Technical Service Bulletin # 180112 Date: 120901

2010-2020 BMW Z4 Technical Service Bulletin # 180112 Date: 120901 Exhaust System - Rattle Noise From Tail Pipe Upon Start Up SI B18 01 12 Exhaust Systems September 2012 Technical Service SUBJECT Rear Muffler Exhaust Flap Diagnosis MODEL All models with the N54, N54T or N55 engine SITUATION A rattling noise is heard from the exhaust tail pipe during start-up. The noise can last up to sixty seconds. CAUSE Insufficient vacuum to hold the exhaust flap shut Note: 2010-2020 BMW Z4 sDrive35i (E89) L6-3.0L Turbo (N54) Page 27 There will be an audible one-time click from the exhaust flap when it opens or closes. This is a normal function of the exhaust flap. PROCEDURE Recommended parts needed for diagnosis (all reusable): 10cm of vacuum line (P/N 11 72 7 545 323) One meter of vacuum line (P/N 11 72 7 545 323) Vacuum line T-fitting (P/N 11 72 1 439 973) Vacuum line straight fitting (P/N 11 72 1 803 012) 1. Remove the vacuum line at the exhaust flap actuator. Install the 10 cm section of test hose with the T-fitting (1). Connect the one-meter section of hose to the open port in the T-fitting. 2. Connect the other end of the one-meter vacuum test line to the pressure port (1) on top of the IMIB. 3. Select the Low Pressure 1 setting from the Multimeter menu section of the IMIB. 2010-2020 BMW Z4 sDrive35i (E89) L6-3.0L Turbo (N54) Page 28 If the engine is cold: The DME will actuate the exhaust flap for approximately 60 seconds once the engine is started. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the engine is at operating temperature: The exhaust flap can also be actuated manually through the ISID. Follow the necessary steps in test plan "B1214_TVD_AGK - Exhaust flap." The exhaust flap actuates for approximately 30 seconds during the test. The engine needs to be shut off and restarted during each test attempt. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the reading is higher than 0.3 bar: 1. Isolate the exhaust flap actuator by splicing in the straight adapter fitting (1). 2. Check the vacuum again at the IMIB (the engine is running cold or through the ISID with the engine at operating temp). 3. If the reading is now within spec (0.3 bar or lower), the diaphragm in the exhaust flap actuator is the source of the leak and the rear muffler with the flap will need to be replaced. 4. If the vacuum reading at the IMIB is still high, then the vacuum line, vacuum source or electrical solenoid/wiring will need to be checked to find the cause of the high reading. from Blogger https://ift.tt/2BO3Ysp

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2010-2020 BMW X6 Technical Service Bulletin # 180112 Date: 120901

2010-2020 BMW X6 Technical Service Bulletin # 180112 Date: 120901 Exhaust System - Rattle Noise From Tail Pipe Upon Start Up SI B18 01 12 Exhaust Systems September 2012 Technical Service SUBJECT Rear Muffler Exhaust Flap Diagnosis MODEL All models with the N54, N54T or N55 engine SITUATION A rattling noise is heard from the exhaust tail pipe during start-up. The noise can last up to sixty seconds. CAUSE Insufficient vacuum to hold the exhaust flap shut Note: There will be an audible one-time click from the exhaust flap when it opens or closes. This is a normal function of the exhaust flap. PROCEDURE Recommended parts needed for diagnosis (all reusable): 10cm of vacuum line (P/N 11 72 7 545 323) One meter of vacuum line (P/N 11 72 7 545 323) Vacuum line T-fitting (P/N 11 72 1 439 973) Vacuum line straight fitting (P/N 11 72 1 803 012) 2010-2020 BMW X6 (E71) L6-3.0L Turbo (N54) Page 33 1. Remove the vacuum line at the exhaust flap actuator. Install the 10 cm section of test hose with the T-fitting (1). Connect the one-meter section of hose to the open port in the T-fitting. 2. Connect the other end of the one-meter vacuum test line to the pressure port (1) on top of the IMIB. 3. Select the Low Pressure 1 setting from the Multimeter menu section of the IMIB. If the engine is cold: The DME will actuate the exhaust flap for approximately 60 seconds once the engine is started. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the engine is at operating temperature: The exhaust flap can also be actuated manually through the ISID. Follow the necessary steps in test plan "B1214_TVD_AGK - Exhaust flap." The exhaust flap actuates for approximately 30 seconds during the test. The engine needs to be shut off and restarted during each test attempt. Measure the vacuum at the IMIB during this actuation phase. If there are no leaks in the system, the IMIB should read 0.3 to 0.0 bar while the exhaust flap is actuating (the flap is closed). If the reading is higher than 0.3 bar: 1. Isolate the exhaust flap actuator by splicing in the straight adapter fitting (1). 2010-2020 BMW X6 (E71) L6-3.0L Turbo (N54) Page 34 2. Check the vacuum again at the IMIB (the engine is running cold or through the ISID with the engine at operating temp). 3. If the reading is now within spec (0.3 bar or lower), the diaphragm in the exhaust flap actuator is the source of the leak and the rear muffler with the flap will need to be replaced. 4. If the vacuum reading at the IMIB is still high, then the vacuum line, vacuum source or electrical solenoid/wiring will need to be checked to find the cause of the high reading. from Blogger https://ift.tt/2Vbf9lC