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  #1  
Old 10-24-2022, 07:53 PM
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Retrofit new style M54 3.0 6cyl Secondary Air Valve Without Vacuum Port?

I was just now able to get my Secondary Air Monitor to set by applying manual suction (vacuum) directly to the Secondary Air Valve on the exhaust manifold when starting the car from cold.

Rather than hassle with vacuum lines that are nearly impossible to access, and the solenoid that is virtually impossible to access, I am wondering if we can, or if anyone has, retrofitted the new style Secondary Air Valve on the exhaust manifold (that started sometime in late 2003 or 2004) that omits the vacuum port?

The newer M54's, from about 2004 on, seem to have eliminated the vacuum port on the Secondary Air Valve and seem to be activated by the positive pressure of the air pump.

Questions are:

1) Shall the air hose from the air pump connect to the new valve and be in the proper position?

2) Does the earlier (say pre-late 2003) air pump create enough pressure to actuate and open the Secondary Air Valve?

If this works, (the engineering upgrade by BMW makes a lot of sense,) we could likely block off the vacuum from the manifold, but leave the solenoid in place, greatly simplifying the system and eliminating hard-to-access failure points, while retaining functionality.

The old part with the vacuum port is: 11727540471

The new part without vacuum port is: 11727553067
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Last edited by stevekat; 10-26-2022 at 04:45 PM.
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  #2  
Old 10-26-2022, 04:32 PM
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As a follow up, I ordered and installed Secondary Air Valve 11727553067 manufactured by Pierburg, that omits the vacuum port. If you blow into the inlet, the valve opens. This valve uses the air pump pressure to open, rather than vacuum from the solenoid.

The inlet on the 11727553067 Secondary Air Valve, is at just a slightly different angle than the valve with the vacuum port. By removing the air hose from the air pump to the secondary air valve, and reversing its direction, makes the hose fit much better.

I reset my ODBII monitors, and the Secondary Air monitor set immediately on cold start with this retrofited valve.

The air inlet hoses between the old and new style valves are different part numbers and appear to be slightly different from photos.

The original Pressure Hose from Air Pump to Secondary Air Valve up to around 2003: 11721438103

The new style Pressure Hose from Air Pump to Secondary Air Valve: 11727510955. I ordered this new style hose to see if has a better fit than the original.

I am not sure where the date cutoff is for the new and old valves. It seems to be around late 2003/2004, or maybe applies to some automatic transmission cars.

I also ordered vacuum cap (3.5mm) 11611437560 that I'll use to cap off the solenoid outlet to the original style Secondary Air Valve, if I can get to it. I am going to leave the solenoid and its hoses in place up to its outlet. It is possible we might be able to cap the vacuum to the solenoid at the manifold, that could be more reachable, but I am uncertain if the solenoid measures the presence of a vacuum internally (and might throw a code.)

This retrofit seems to simplify the Secondary Air System, and ease troubleshooting in the future, while apparently retaining its function with factory parts.

It also seems like a straightforward pathway if the goal is to get the Secondary Air monitor set.
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Last edited by stevekat; 10-26-2022 at 08:45 PM.
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Old 10-26-2022, 04:36 PM
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Yes, that does make for a much simpler system if it all fits and works together. Good info!
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  #4  
Old 10-26-2022, 05:03 PM
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Retrofitted Secondary Air Valve without vacuum port, with original air supply hose reversed.

Hose angles are much better, and more clearance to the AC hose.
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Last edited by stevekat; 10-26-2022 at 08:43 PM.
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  #5  
Old 10-26-2022, 05:55 PM
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Newer version secondary air valve on facelift (10/2003->) with automatic gearbox.

Isn't the vacuum connection for solenoid supply at the rear end of intake manifold and should be reachable without removing things.

The diagnostics will only monitor the solenoid regarding the electric condition (resistance) of coil. Nothing to do with presence of vacuum.
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Old 10-26-2022, 08:40 PM
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Thank you for the clarification/detail on the date/vehicle configurationn for the new version valve.

I think you can (vaguely) reach the vacuum connection at the rear of the intake manifold that supplies vacuum to the solenoid. I've seen it with a mirror and have reached back there with contortions. I'd rather cap the output of the solenoid, but with your info on the system not measuring vacuum, disconnecting at the intake manifold should be OK.

I did notice there is a OBDII PID on my scanner that reads/reports Secondary Air and reports 'Atmos' for Atmosphere, when the Secondary Air System is not energized, and another status when it is active (I can not remember the word they use for the active status.) From what you described, it sounds like that status could be what is reported based on the electric condition (resistance) of the coil, or possibly simply if the circuit is energized.
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Old 10-26-2022, 09:00 PM
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By plugging it directly at the manifold connection you rule out any possible future problems in that line causing a vacuum leak.
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