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What is this piece on top of manifold called?

Tiny
BHAMDOC1973
  • MEMBER
  • 2011 BMW 335
  • 6 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 119,000 MILES
About to reinstall the intake manifold. There is a sensor on the top right of the intake that pops into a grommet which I have lost and I want to try to buy the grommet. Do you know what this sensor is? Temperature sensor maybe? This is a 335d diesel.
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Saturday, June 18th, 2022 AT 2:31 PM

4 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

This is the Manifold Absolute Pressure Sensor (MAP).
The MAP sensor sends data to the ECM for it to control air fuel mixture.

You might have to purchase a new sensor as most of the time the grommet is not available by itself.

Let me know of any questions.
Thank you.
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Saturday, June 18th, 2022 AT 4:38 PM
Tiny
BHAMDOC1973
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Got it, thanks.
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Saturday, June 18th, 2022 AT 5:01 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,560 POSTS
What does it do? If I just leave it hanging and start the car for now would I get a rough idle? I found the rubber piece online.
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Saturday, June 18th, 2022 AT 5:04 PM
Tiny
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  • MECHANIC
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The MAP signals the ECM to help determine how much fuel to provide. So, it will likely run rough and trigger the check engine light.
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Saturday, June 18th, 2022 AT 7:12 PM

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