Throttle body

mike3000fl · 10-14-2013, 12:20 AM

Does the butterfly valve in your throttle body close completely or is there a small gap? Mine has a very small gap, I can push it closed completely but it moves back to a slightly open position. Normal?

smc325xi · 10-14-2013, 12:29 PM

Yep, got to have some air coming in at idle!

JustROLLIN · 10-14-2013, 03:47 PM

While the above statement is accurate, most TBs rely on another part, IAC (Idle Air Control) to handle that task in a much more precise manner than just leaving the TB butterfly open partially. All of that said, I am pretty new to BMW and not sure what metering system they use.

Johnny D · 10-14-2013, 10:38 PM

The throttle body on the n52 is nothing more than a back up system. During normal operation idle is controlled by the valvetronic system. As long as the throttle body opens up fully during operation it will be fine.

There is no idle control valve as there use to be on older BMWs. It wouldnt work because there is no vacuum on this motor. Vacuum is created by a pump connected to the timing chain.

10-14-2013, 12:20 AM	#1
mike3000fl Banned 138 Rep 2,731 Posts Drives: 06 330i Join Date: Feb 2010 Location: Tampa iTrader: (0)	Throttle body Does the butterfly valve in your throttle body close completely or is there a small gap? Mine has a very small gap, I can push it closed completely but it moves back to a slightly open position. Normal?
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10-14-2013, 12:29 PM	#2
smc325xi Enlisted Member 2 Rep 40 Posts Drives: 2006 e91 325xi Join Date: Apr 2012 Location: Washington iTrader: (0)	Yep, got to have some air coming in at idle!
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10-14-2013, 03:47 PM	#3
JustROLLIN Private 0 Rep 75 Posts Drives: 2007 e90 328xi Join Date: May 2013 Location: Mpls, MN iTrader: (0)	While the above statement is accurate, most TBs rely on another part, IAC (Idle Air Control) to handle that task in a much more precise manner than just leaving the TB butterfly open partially. All of that said, I am pretty new to BMW and not sure what metering system they use.
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10-14-2013, 10:38 PM	#4
Johnny D Major 64 Rep 1,087 Posts Drives: 2006 BMW 325i Join Date: Apr 2011 Location: Hot Springs, AR iTrader: (4) Garage List 2006 BMW 325i [9.16]	The throttle body on the n52 is nothing more than a back up system. During normal operation idle is controlled by the valvetronic system. As long as the throttle body opens up fully during operation it will be fine. There is no idle control valve as there use to be on older BMWs. It wouldnt work because there is no vacuum on this motor. Vacuum is created by a pump connected to the timing chain. __________________
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