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BMW E36 3 Series 1992-1998 (318i/s/ti, 320i, 323i, 325i/s, 328i/s, M3, conv) secondary air flow


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Last Post: Jan 19, 2015 8:01 AM Last Post By: rob1roi
hdeglide1

Posts: 1
Registered: 12/09/03
secondary air flow
Posted: Jun 19, 2003 1:16 PM
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Keep getting check eng. light, code is F-6 low secondary air
Chk'd the secondary air pump which runs ok cold start, filter on top seemed to be dirty wanted to replace same but dealer says pump and filter is one unit and my pump is working find. I also took the divertor valve off and cleaned same and ck'd lines to and from all ok. What am I missing to correct this problem?
Charlie

Posts: 4,783
Registered: 12/09/03
Re: secondary air flow
Posted: Jun 19, 2003 1:23 PM   in response to: hdeglide1 in response to: hdeglide1
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Are you getting a good source of vacuum to the air valve. If the pump is running but the air is not getting through... This code usually sets when the pump runs and the pre-cat oxygen sensor does not see 'lean'.
Nawed

Posts: 62
Registered: 12/09/03
Re: secondary air flow
Posted: Sep 25, 2003 12:03 AM   in response to: hdeglide1 in response to: hdeglide1
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my dealer says I have to replace my secondary air pump as i have the check engine light now. couple of questions:

1. is it easy to install myself? this thing is an expensive part! (250 US)
2. will the check engine light go away automatically when i replace it myself or would it have to be reset?
3. where is it located on an E36 (98 318i)?

Hope someone can help. There is no documentation on the Bentley manual for some reason.
Charlie

Posts: 4,783
Registered: 12/09/03
Re: secondary air flow
Posted: Sep 26, 2003 11:53 AM   in response to: Nawed in response to: Nawed
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Wow, I`cant' beleive that pump is $250. Have you tried an aftermarket parts house? This is a common part, you should be able to source it somewhere else. I beleive the pump is visible in the left rear of the engine compartment. Easy to replace. The check engine light will go away after a driving a while (needs to run the self 'test' 40 times without seeing a fault).
Charlie

Posts: 4,783
Registered: 12/09/03
Re: secondary air flow
Posted: Sep 26, 2003 11:57 AM   in response to: Nawed in response to: Nawed
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Thanks for the link.
Nawed

Posts: 62
Registered: 12/09/03
Re: secondary air flow
Posted: Sep 28, 2003 9:24 PM   in response to: Charlie in response to: Charlie
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Charlie, do you know what the pump looks like? I don't believe bentley manual has anything on the pump. Appreciate any help you can offer as I attempt to replace it myself in the next few weeks.
Charlie

Posts: 4,783
Registered: 12/09/03
Re: secondary air flow
Posted: Sep 29, 2003 8:10 AM   in response to: Nawed in response to: Nawed
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It is in the right rear corner of the engine compartment. It looks like a motor of sorts, cylindrical with a larger base. It should have two hoses going to it. It should be very obvious. Hope this helps.
net_architect

Posts: 6
Registered: 12/09/03
Re: secondary air flow
Posted: Oct 16, 2003 9:12 PM   in response to: hdeglide1 in response to: hdeglide1
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I had a similar problem with my '98 328i. On cold starts, the secondary air pump would turn on and seemed to operate fine (good air flow into and out of the pump). Proceeded to check all connections to the check valve. All hoses were fine (no cracks/splits) and connections were good. Turned out to be check valve itself. The exhaust 'gunks' up the valve so that over time it doesen't fully open. I decided to change the valve myself (as the dealer wanted to change both the valve and secondary air pump) and it fixed the problem. The check engine light will go out after 3 subsequent problem-free cold starts.
sircarter

Posts: 2
Registered: 03/28/05
Re: secondary air flow
Posted: Mar 28, 2005 2:14 PM   in response to: hdeglide1 in response to: hdeglide1
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My '96 328i has a problem at cold start. The is no Check Engine light but the car idles close to 500 or less sometimes. My technician ran the DME and it came up Secondary Air Systems cylinders 4-6. I knew that the secondary air pump was faulty, but would it make the car run differently? Or is it only for emissions?
Charlie

Posts: 4,783
Registered: 12/09/03
Re: secondary air flow
Posted: Mar 28, 2005 2:24 PM   in response to: sircarter in response to: sircarter
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If there is an secondary system air leak, such as a broken vacuum line, or a stuck open check valve at the exhaust manifold, it could cause driveability issues. But you are right, the pump only runs during a cold start and pumps fresh air into the cat. If the system is intatct but not working, it should not affect the way the engine runs.
oldbmw

Posts: 13
Registered: 01/24/08
Re: secondary air flow
Posted: Jan 24, 2008 2:10 PM   in response to: hdeglide1 in response to: hdeglide1
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After getting faults F5&F6, I have replaced the secondary air pump and check-valve (it was stuck open)---very expensive fix; however, when I started the vehicle, the pump did not come on and there is no vacuum to the check-valve. I'm not sure where the pump gets power from or if the electric solenoid (as shown in picture on Bently manual pg 130-5) is bad. Anyone have any ideas on what to troubleshoot next? I have been trying to get a service manual, or book that shows more detail for the electric solenoid, and where the power to the pump comes from, but can't find one.
Thanks
Charlie

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Registered: 12/09/03
Re: secondary air flow
Posted: Jan 25, 2008 10:01 AM   in response to: oldbmw in response to: oldbmw
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Are you getting fault codes still. What year and model? I'll look for a wiring diagram.
Charlie

Posts: 4,783
Registered: 12/09/03
Re: secondary air flow
Posted: Jan 25, 2008 10:01 AM   in response to: Charlie in response to: Charlie
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Oops, just saw '98 328i.
Charlie

Posts: 4,783
Registered: 12/09/03
Re: secondary air flow
Posted: Jan 25, 2008 10:07 AM   in response to: oldbmw in response to: oldbmw
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Pump is turned on by DME (ground at terminal 85 of relay)
oldbmw

Posts: 13
Registered: 01/24/08
Re: secondary air flow
Posted: Jan 28, 2008 12:32 PM   in response to: Charlie in response to: Charlie
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Charlie
Thank you very much. You are AWESOME. Not sure where you got the info, but you are the only person that has been able to provide me info, not even the Bavarian auto guys that I bought the parts from knew where to find the relay.
My year is actually 1996. I noticed that you thought it was a 1998. Does this diagram still apply?
From the drawing you supplied, it looks like the relay is K6304, is this right?
Thanks a bunch again.
oldbmw

Posts: 13
Registered: 01/24/08
Re: secondary air flow
Posted: Jan 28, 2008 12:43 PM   in response to: Charlie in response to: Charlie
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Charlie
Do you know how the electric solenoid valve that supplies vacuum to the air check valve works? It seems that vacuum is getting to the electric solenoid valve's input, but there is no output from that valve. It has wiring to it, but I'm not sure where it goes to. If possible, I would really appreciate a similar diagram to that valve and info on how it works.
Again, thanks for helping me with your last post. It seems you are the only knowledgeable BMW person that I have encountered so far.
oldbmw

Posts: 13
Registered: 01/24/08
Re: secondary air flow
Posted: Jan 29, 2008 11:32 AM   in response to: Charlie in response to: Charlie
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Charlie
I tried the relay displayed on your diagram last night and "no go". The drawing you provided is for an E46 engine and mine is an E36 engine. I assumed that it would be the same, but that's not the case.
I did use the drawing to check that the pump is grounded on both terminals, when the vehicle is off. I turned the car on and there is NO 12 VDC going to the pump. I'm not sure where the relay is so I hope I can get another drawing from you for my vehicle (1996, 328IS, E36). Also, I attached a drawing that shows an electric solenoid valve (#2 on drawing). When I turn on the car, I get vacuum to the input, but nothing going out to the check valve. I see that there is wiring to the valve, but I'm not sure where it goes to. Do you have any electrical diagrams for that valve?
Thanks again and hope to hear from you soon.
atye

Posts: 2
Registered: 01/29/08
Re: secondary air flow
Posted: Jan 29, 2008 11:46 AM   in response to: oldbmw in response to: oldbmw
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I am experiencing the exact same problem on my 1997 328is. I am replacing both the pump (which was rusted solid) and the check valve, but during my initial diagnosis, I could not get 12v to the SAP connector. I will change the relay, but i have no idea exactly where it is on my car. Every drawing I see shows it in a different location.
oldbmw

Posts: 13
Registered: 01/24/08
Re: secondary air flow
Posted: Jan 29, 2008 11:49 AM   in response to: atye in response to: atye
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I know the frustration. I have been e-mailing BavarianAuto, but they have not been very helpful now that they have my money for the parts. The only knowledgeagle person is Charlie. I am waiting for his response to my posts. Keep an eye on his posts.
Charlie

Posts: 4,783
Registered: 12/09/03
Re: secondary air flow
Posted: Jan 29, 2008 12:11 PM   in response to: oldbmw in response to: oldbmw
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I'll take a look into things tomorrow. Too much on plate today. -Charlie

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