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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 03-14-2009, 04:15 PM   #1 (permalink)
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What is that part underneath my Throttle Body?

And no...its not the TPS It is a rubber piece with a tube that goes into the bottom side of my throttle body. it has an electrical connection going into as well (like the ICV does) I believe it has something to with with fuel but Im no mechanic. Can anyone tell me what it is? Ill take a pic if no one knows so you guys can see it too. Let me know people!
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Old 03-14-2009, 08:29 PM   #2 (permalink)
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yes, a picture would help me alot, I have an 88 as well and would like to see where you are speaking of. I will probably have the same issue here shortly myself so this is research of sorts for me....thanks.....
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Old 03-14-2009, 11:37 PM   #3 (permalink)
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I have been researching that today for myself. It is a "Charcoal canister bypass valve". It prevents fuel vapors from being drawn into the engine at the wrong time, such as starting and idling. If its faulty it can cause hard warm engine starting and erratic idle. Thats straight out Bentley....lol
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Old 03-16-2009, 05:54 PM   #4 (permalink)
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Originally Posted by 325guy View Post
I have been researching that today for myself. It is a "Charcoal canister bypass valve". It prevents fuel vapors from being drawn into the engine at the wrong time, such as starting and idling. If its faulty it can cause hard warm engine starting and erratic idle. Thats straight out Bentley....lol
Searched this mysterious "charcoal canister bypass valve" and apparently it is only on the US version of the car to pass our standards of emissions. Some guy was having starting and idling issues so he pinched off the tube that goes from the canister to the valve itself and unplugged the valve's connection and his car runs fine now. its not like an old car has to pass emissions (at least thats how it is in Mass) thanks for the responses everyone!

Ill be getting it together 2morrow hopefully! if the BavAuto shipment comes in. ill be back on here to let you guys know if you need that stupid thing!

Last edited by 325isBMW1988; 03-16-2009 at 05:55 PM. Reason: added something else
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Old 04-14-2009, 10:34 PM   #5 (permalink)
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Well? did the canister solve your problem?
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Old 04-15-2009, 06:57 PM   #6 (permalink)
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well it didnt really seem to help or make it worse so i just left it alone. My engine problem was a faulty fuel pump (even though it was new).
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