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E30 Vacuum leak – ‘advanced’ location under the throttle body

May 22, 2013
By

After blowing a coolant hose I had accidentally pulled off the ‘fuel tank breather valve’ off of its nipple on the throttle body plate.

The symptoms where:

-Check engine code 1222 but only at idle after 10 seconds and would disappear when throttle was given
-Uneven idle

This is what the breather valve looks like unplugged from its nipple:
IMG_0769

The nipple is located on the throttle body plate from the UNDERSIDE, behind the throttle positioning sensor. The nipple can barely be seen in good lighting through the hole which I have indicated with a green arrow. No dis-assembly is required to plug and unplug this valve hose.
Throttle body plate fuel tank breather valve

This is a pictures looking through that hole (in the pictures the hose has already been plugged back on the nipple):
fuel tank breather valve hole

Here is another pictures from a different angle:
fuel tank breather valve

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