secondary air system monitor not ready (fixed!!!)
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Anytime at hot idle, if the total fuel trim (STFT + LTFT for that bank) settles above 10%, it is indicative of a vacuum leak. Yours is around 15%.
To confirm if it's a vacuum leak, you rise the rev's and watch the STFT. If it drops, might even go negative, then this confirms that you have a vacuum leak.
Your notes above are doing this test.
What is happening? The unmetered air has more impact on the fuel trims at idle than at rev's because the ratio of unmetered air to metered air is greatest at idle. The fuel trims go rich (negative) when reving because that is how the engine works. It adds more fuel to support the increase in load.
Good luck with the smoke test and repairs.
Video 1 - Fault Report
Video 2 - o2 sensor control/mixture
Video 3 - engine operating values
i linked some videos above with a better obd scanner and it shows the maf sensor functioning in kg/h
doing the smoke test now. thank you for your help so far 👍
when i did the scan with a different obd scanner the “mass air flow” value was around 11.3 kg/h
i’m wondering if this maf value is correct?
Yes, it's about 3 g/s
^^ after the smoke test i found a massive hole in the lower intake boot elbow. this leak was so big it wasn’t letting me see any of the other leaks due to the smoke.
^^ i also added smoke to the vacuum line connected to the control valve on cylinder head
^^ the line goes back behind the engine into the black plastic vacuum control valve for SAP
^^ it leaks in this area when i add smoke to the vacuum hose connected to the control valve
any idea what could be leaking behind the intake manifold?
Attachments
Use a mechanic’s mirror and bright light.
Search and read on here to verify, but I think it is expected that the electric air valve vents to atmosphere when closed.
i looked for a long time and couldn’t find anything. also used my phone to record that area. do you think this electric valve is venting when it’s closed?
Well done in finding the vacuum leaks.
There is a number of soft lines behind the manifold for the SAP, plu the valve and a one way valve. Note how the one way valve is plumbed. It's black and white so that helps.
Some reading:
www.e46fanatics.com
Post #34: Some new codes! 2002 325i intake manifold removal project
Links in post #3: Retrofitted Old-Style SAP ?? MYSTERY
There is a number of soft lines behind the manifold for the SAP, plu the valve and a one way valve. Note how the one way valve is plumbed. It's black and white so that helps.
Some reading:
SAP vacuum switch access - solved
A tip for SAP failure when no vacuum is present on the control valve that sends fresh air (pump output) to the exhaust manifold. I've seen a few DYI's that miss a couple tricks. When you have to dive behind the drivers side, rear engine location to remove the switch, you may have difficulty...
www.e46fanatics.com
Post #34: Some new codes! 2002 325i intake manifold removal project
Links in post #3: Retrofitted Old-Style SAP ?? MYSTERY
i could barely reach back there. i might just take the intake manifold off to look at all the lines.Well done in finding the vacuum leaks.
There is a number of soft lines behind the manifold for the SAP, plu the valve and a one way valve. Note how the one way valve is plumbed. It's black and white so that helps.
Some reading:
SAP vacuum switch access - solved
A tip for SAP failure when no vacuum is present on the control valve that sends fresh air (pump output) to the exhaust manifold. I've seen a few DYI's that miss a couple tricks. When you have to dive behind the drivers side, rear engine location to remove the switch, you may have difficulty...
Post #34: Some new codes! 2002 325i intake manifold removal project
Links in post #3: Retrofitted Old-Style SAP ?? MYSTERY
wondering if air is supposed to vent out of that electric vacuum valve? because when i pump smoke it comes out in that area.
wondering if that’s supposed to happen because “Bali” stated it should vent air out when it’s off.
basically what i’m asking is if i actually have a vacuum leak back there or is it normal for the valve to vent air when off???Well done in finding the vacuum leaks.
There is a number of soft lines behind the manifold for the SAP, plu the valve and a one way valve. Note how the one way valve is plumbed. It's black and white so that helps.
Some reading:
SAP vacuum switch access - solved
A tip for SAP failure when no vacuum is present on the control valve that sends fresh air (pump output) to the exhaust manifold. I've seen a few DYI's that miss a couple tricks. When you have to dive behind the drivers side, rear engine location to remove the switch, you may have difficulty...
Post #34: Some new codes! 2002 325i intake manifold removal project
Links in post #3: Retrofitted Old-Style SAP ?? MYSTERY
I do not know. Both of my spare inlet manifolds have been stripped of the SAP valves etc, so I can't test it.
The first thread I linked was about getting better access without taking he manifold off. Maybe try that access and see where the smoke comes from.
thank you !!
so last night all of my monitors got “ready” except the secondary air system monitor. right now i have 7 out of 8 monitors ready.
when cold starting in the morning i try to listen if the air pump turns on and it does not! i tested if the connector is getting power and it does get power at cold start. i tested the fuse and relay. i also took the pump out and put power to it. the pump turned on outside the car when i added power. what could be the fault in this system?
pending codes…
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i could try cleaning connector with electrical cleaner spray? i noticed it was a little bit greasy/oily around the plugs but don’t know if it’s enough to make a difference.
The SAP only runs when the DME thinks it needs to. That typically means a cold start. So if your engine is warm/hot or the DME thinks it's warm/hot or if the ambient temperature is too hot (too hat actually or the ambient temperature sensor is reporting the wrong temperature), the SAP won't be commanded to run.
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