X5 3.0 secondary air injection WTH! NOW W PICS

g300d · #1 04-12-2014, 03:57 AM

So I have an OBD secondary air injection code that was reset but reappeared.

First thing I checked was the pump. From a cold start it went on and blew hard.

Next I look at the valve. It wasnt open.

I looked for the vacuum line to open it but there wasnt one, nor any trace of one.

Realoem clearly shows a vacuum line goin to the valve.

What gives??!

EDIT: Here is the realoem diagram for the secondary air inj system. Note item 1, the valve, and item 3-4, vacuum lines attaching to a fitting on valve housing.

Here is the valve on my motor. Notice the lack of a vacuum fitting for the vacuum hose to attach to:

The valve is closed on cold start, it should be open. It should be actuated by vacuum but there is no place on my valve for a vacuum line to hook up to. No trace of any vacuum line or remnants thereof by the side of the valve cover.

According to realoem my valve's part number is 11727540471. Google shows pics of this and they all have a barbed fotting for a vacuum line which mine does not have.

luvmy03E53 · #2 04-12-2014, 11:28 AM

That vacuum line comes from a valve on the back side of the intake manifold. The rubber hose and hard plastic line that make up that vacuum line are notorious for becoming brittle and disintegrating. The line should run from the valve near the pump, down the exhaust side of the head, around the back of the head to an electric valve mounted on the back of the intake manifold. You should be able to find some remains of the line if you look along that route. Of course you'll need to remove the plastic engine cover to get a better look. I'd post pics of this if I could, but I'm on my iPhone at the moment. Good luck!

Sent from my iPhone using Tapatalk

g300d · #3 04-12-2014, 09:25 PM

The problem is my valve does not have any sign of a vacuum fitting to fit a vacuum line on!

I was trying to find the vacuum fitting on the valve where I can hook up a vacuum pump to try to actuate the valve...there doesnt seem to be one.

Very bad internet connection, will post up the pics later.

g300d · #4 04-13-2014, 08:11 PM

Pics up

dkl · #5 04-13-2014, 10:43 PM

My '04, 3.0i looked exactly like yours...no vacuum line (items 3 & 4). Your valve is not connected to the air pump?

Where did you pull that picture from? My RealOEM search showed this, which doesn't have any vacuum line attached to the valve:

ArmyX5 · #6 04-14-2014, 12:38 AM

BMW redesigned this part after 01/04. The new part number for X5 after Jan.04 is 11727553067. No vacuum line, only the Air pump hose. I had to replace mine twice because it will get exhaust residue and get stuck.

PS. Also, check the secondary Mass air flow sensor. It will go back and give you the same code.

lhordmclain · #7 04-14-2014, 09:28 AM

Correct me if I am wrong .. These are all emission related parts that does not affect the engine performance ( only for low emission and state inspection )

And I agree with you dkl, the diagram looks the same for my 04 e53 3.0l

I just experienced a SES related to part #8 secondary MAF (VDO Siemens ) and part #14 EGR valve

I was contemplating on replacing the filter as well. But since the SES light did not appear/pop-up again since I cleared it..... I dropped this project

To the op, please double check with real eom again with your vin since your have e53 3.0i like us.

Quote:

Originally Posted by dkl

My '04, 3.0i looked exactly like yours...no vacuum line (items 3 & 4). Your valve is not connected to the air pump?

Where did you pull that picture from? My RealOEM search showed this, which doesn't have any vacuum line attached to the valve:

g300d · #8 04-14-2014, 05:24 AM

Dkl, I got the diagram from realoem as per my vin. The pic of valve is from google, I googled the valve part number that came up on realoem. I have an 04 same as you, I wonder why the older system diagram showed?

Your diagram looks more like it though, thanks for posting that up!

Hose was disconnected as I was testing pump operation at the time.

ArmyX5, thanks for the clarification!

The diys for the earlier system say the valve should be open at cold start, I presume with this system it should be open as well? Mine was closed.

Which is the secondary mass air flow sensor and how can you function check it?

This newer system looks to work a bit differently from the older one, the diy's online are for the older system so I cant quite translate it to this system. For example, I cant see how the valve opens or closes now.

Hoping someone can give a basic overview of how this system works and maybe some troubleshooting tips too?

ArmyX5 · #9 04-14-2014, 06:57 PM

Quote:

Originally Posted by g300d

Dkl, I got the diagram from realoem as per my vin. The pic of valve is from google, I googled the valve part number that came up on realoem. I have an 04 same as you, I wonder why the older system diagram showed?

Your diagram looks more like it though, thanks for posting that up!

Hose was disconnected as I was testing pump operation at the time.

ArmyX5, thanks for the clarification!

The diys for the earlier system say the valve should be open at cold start, I presume with this system it should be open as well? Mine was closed.

Which is the secondary mass air flow sensor and how can you function check it?

This newer system looks to work a bit differently from the older one, the diy's online are for the older system so I cant quite translate it to this system. For example, I cant see how the valve opens or closes now.

Hoping someone can give a basic overview of how this system works and maybe some troubleshooting tips too?

The secondary mass air flow sensor is item # 8. I am sorry, but the only troubleshooting that I know about this problem is to replace the cheapest part first and see if the problem goes away. I decided to replace both parts, that was 2 years ago, and no issues since then.

g300d · #10 04-14-2014, 08:03 PM

No problem ArmyX5, what you posted was helpful in getting this on the right track, thanks!

Been looking at the diagram and ready to make an educated guess. I hope someone with experience on the system can chime in and correct me if I'm wrong.

On cold start, DME turns on the air pump, and the air pushes the mechanical valve open against spring tension and allows air into the cylinder head/exhaust system.

DME shuts off air when a certain set of parameters are met and the valve is pushed closed by its spring.

The air pump obtains its air through its own intake with its own air mass sensor connected to the DME to allow it to monitor the amount of air the pump flows.

A partially/fully stuck valve, or weak pump, would reduce the amount of air sucked through the air flow meter and serve as a signal to the DME that something is wrong with the system, which will cause the DME to trigger the SES light since this is an emissions system-related issue.