How To Adjust TB Butterfly

[400horses]

Per the title, I just took my MAF and TB off for a cleaning, as my mustang is having a surging idle issue since changing tune back to stock.

TB is dirty, and needs a good clean. However, despite that, I noted the butterfly also remains open always.

how much, if any, should there be a gap on these 2012 Mustang throttle bodies? If you look at the below images, the image with the butterfly closed is with my finger depressing it. The gap is the butterfly in its relaxed state.

I am curious if this is simply the necessary gap, or if this is something I need to modify to get it set at closed again before reinstalling.
Any and all assistance is greatly appreciated!

 

[David Young]

My 2011 v6 throttle body is slightly opened also. I think it's normal. I 'forgot' to check to see if it closes when the electrical plug is put back on before I hooked up my cai tube . Plug the electrical plug back in and see if it closes after you reinstall the throttle body.

 

[wicked93gs]

The TB on both my 3.7L manifold and my 3.0L manifold are both slightly cracked open, I am pretty sure its the resting position of the stepper motor and only closes once the engine is actually started(if it didnt close that much air would idle at 2500RPM+)