Did a boost leak test and found the Idle air screw oring leaking and this fitting on the back of the throttle body that idk the name of it. Apperently it’s only on the 03-04 evo 8. Anyone know where I can get the oring for this?

Back side of throttle body

 

@Derekhollister

Think there is just one kit for both the 8 & 9

https://www.maperformance.com/produc...lution-viii-ix

 

Those are the throttle body shaft seals. Here is the BISS O-ring

https://stmtuned.com/collections/mit...=1561931055113

I wasn't ever able to track down an OEM O-ring for the other cover and I just used one from an assortment set of o-rings that I purchased.

 

Ahh ya those are the shaft seals, would I be able to take it out and match it up with the assortments that O’reilly’s have? Is it a pretty common size

 

Yes, I just used an o-ring from a big assortment pack. Can't remember the size unfortunately.

 

+1. I used one from an assortment of O-Rings, its a generic size. Biss Screw O-Ring is a hard to find size, I had to order a new Biss Screw and O-ring from MAPerformance, it was like $8 IIRC.

 

Cool thanks all. I order a new TB gasket, screw and o ring, I’ll pull that cover off and patch the existing oring. The. Redo a leak test and see what if anything else it

 

This is a pretty detailed vid showing the process to swap out the seals if required

 

I got them changed it was just the 2 then found my injector seals leaking