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post #1 of 17 Old 20th April 2019, 08:07 AM Thread Starter
John Choe
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Squeal or something more serious?

Hey guys, my 08 M6 started making sort of like a squealing/rattling sound on startup and seems to go away after the car is driven a bit. I believe itís on the front passenger side. What could it be? If you raise the volume you can clearly hear it. Hopefully itís something as simple as a worn belt? Can anyone chime in? https://youtu.be/5leIUaRH4P4


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post #2 of 17 Old 21st April 2019, 01:35 AM Thread Starter
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Hey guys I just pulled these codes from the car. The first 2 codes for the air pressure sensor has been on for a while but I havenít looked into it until this rattling noise appeared a few days ago. Any help would be appreciated.


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post #3 of 17 Old 21st April 2019, 07:20 PM
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1418 and 1411 can relate to the secondary air pump, overall issue could also be MAF related as well. Air pump is behind the front wheel lining next to the main flow oil filter. So it makes sense to me if you are hearing a noise from there combined with the codes thrown.

That is where I would start looking.

Best of luck!

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post #4 of 17 Old 27th April 2019, 01:06 AM Thread Starter
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Quote:
Originally Posted by Slamfire View Post
1418 and 1411 can relate to the secondary air pump, overall issue could also be MAF related as well. Air pump is behind the front wheel lining next to the main flow oil filter. So it makes sense to me if you are hearing a noise from there combined with the codes thrown.



That is where I would start looking.



Best of luck!


Thank you. I will have to go test in ISTa.

Do you or anyone know how I can delete the sap altogether? I have a tune and headers so Iím assuming itís not even needed.


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post #5 of 17 Old 1st May 2019, 07:59 PM
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Maybe the clutch pulley going on the compressor. Or one of the other pulleys starting to go, alternator is also on the passenger side.

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post #6 of 17 Old 1st May 2019, 08:50 PM
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I can't hear the video well but based on the codes would guess it is the SAP pump.

-Does it happen only on cold starts?
-Does the pitch of the squeal not change with RPM?
-Does the noise come from the right front of the bumper (near oil filter housing)?

If yes on all three I'd almost guarantee it is the pump going out. One or both of the SAP valves may be stuck open as well, that usually kills the pump quickly by sending hot/moist air into it when the pump is not running.
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post #7 of 17 Old 2nd May 2019, 04:15 AM Thread Starter
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Quote:
Originally Posted by gpeterson View Post
I can't hear the video well but based on the codes would guess it is the SAP pump.



-Does it happen only on cold starts?

-Does the pitch of the squeal not change with RPM?

-Does the noise come from the right front of the bumper (near oil filter housing)?



If yes on all three I'd almost guarantee it is the pump going out. One or both of the SAP valves may be stuck open as well, that usually kills the pump quickly by sending hot/moist air into it when the pump is not running.


Yes it happens only when I start the car for the first time for the first 5 mins or so. Sounds almost like the belt is rubbing on something. Then slowly fades as the engine gets warmer. Sounds like a rattle from inside the car with the windows open.
The pitch or the volume doesnít go up nor change. But the sound does get faster as the rpm goes up.

I actually pulled the side of the bumper to reveal the sap and doesnít seem like the noise was coming from there but rather from the front belts fan area. Also checked a the connections to the sap.

My PC is actually in repair as we speak so still havenít gotten into ISTa to test anything.


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post #8 of 17 Old 6th May 2019, 08:42 PM
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My SAP whines on cold start then goes away after about 30 seconds. Every so often it trips an emission code but for now I'm probably not going to mess with it. Do you have to remove the fender liner to access it?
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post #9 of 17 Old 26th June 2019, 05:00 AM Thread Starter
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Alrite guys hereís an update on the issue and if any users can chinenin on the current t situation that would be great.
So the issue for the squeal would up being the belt for the power steering snapped. So I replaced that and the sound went away.
The codes however are still present and have popped up again after clearing them. Here are the actual codes pulled from ISTA. I have tested the SAP and did the diagnostic readings with no fault in ISTa which makes believe that I need to check lines from dme to sap. But where can I find the dme? I know the ecu is under the passenger side cabin filter. Also anyone ever have the codes thrown ?


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post #10 of 17 Old 26th June 2019, 01:09 PM
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There is an inline maf from the airbox to the SAP pump check there first. As you said the DME is the DME box under the Pass(us) side cowlings.

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