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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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Old 05-21-2019, 12:21 PM
K.C.1 K.C.1 is offline
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Need help identifying this

After very heavy rain on Saturday here in Dallas, my car developed a misfire. Found a good amount of rust and water in the coil/spark plug tubes from cylinders 5 & 6. Replaced all plugs and coil packs.

While putting everything back together I found this tucked under the intake runners. Need help finding out what it is, why it's disconnected, and why it was disconnected if on purpose? Clearly has vacuum lines but car is running fine. Thanks

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Old 05-21-2019, 01:20 PM
bluptgm3 bluptgm3 is offline
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Do you have a functioning SAP system?
I think that is the actuator for the SAP vacuum control unit.


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Old 05-22-2019, 12:48 AM
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Engel12626 Engel12626 is offline
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Originally Posted by bluptgm3 View Post
Do you have a functioning SAP system?
I think that is the actuator for the SAP vacuum control unit.


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Yup. Vacuum control valve.
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Old 05-22-2019, 08:43 AM
K.C.1 K.C.1 is offline
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I hear the SAP running when I cold start the car (my entire neighborhood can with how loud it is). So the pump is there and still connected. No codes or CEL. Guess its time to remove the entire thing.
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Old 05-22-2019, 12:59 PM
bluptgm3 bluptgm3 is offline
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Reconnect the vacuum control hose…LOL!!


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Old 05-22-2019, 01:59 PM
K.C.1 K.C.1 is offline
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Originally Posted by bluptgm3 View Post
Reconnect the vacuum control hose…LOL!!


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Well if the hoses were there then I would have. I searched everywhere around the intake manifold to figure out what it was before posting this with no luck.
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Old 05-22-2019, 02:07 PM
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hornhospital hornhospital is offline
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If you remove the secondary air pump and associated parts you'll need to install a SAP emulator, or you'll get a constant error code/CEL.
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Old 05-23-2019, 02:44 PM
spyderg0d spyderg0d is offline
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The hoses that ran to and from that valve probably rotted and fell away. One end goes to intake, other to vacuum canister.
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