Q45 Throttle Body Leakage - Anyone Else

[adampecush]

So I finally got around to doing a pressure test of my intake system. It turns out that my Q45 throttle body is leaking from the shaft seal. Has anybody else experienced and managed to fix this, or do I get a new (used) TB and hope for the best? If I pushed the throttle arm toward the TB, the leak stopped, though obviously, this is not a permanent fix.

Other leaks found included the EGR modulator...although upon reviewing the TSRM, it seems as though this is expected.

 

[gofastgeorge]

That little leak is so small, it won't effect a thing.

 

[adampecush]

I was wondering about that...I suppose you are right. At 15 psi, you could barely feel the leak putting your face up to the TB, so there's not a lot of volume lost there.

Holy shit, the throttle plate howled like a motherfucker when pressurized!

 

[figgie]

it will start small but rest assured it will grow

There was a whole slew of aftermarket TB that were doing that. Leaking past the seal.

 

[adampecush]

I'm quite choked since this was an OEM TB (although I suppose not meant for boost)

I'm going to try using vacuum grease on the shaft O-rings and see if that helps.

 

[IJ.]

You'd need to test it at operating temps to see if it's an issue or not Adam

 

[iceberg319]

mine does the same thing, i did a google search on how to fix it and i didnt come across anything. someone even tried switching seals and it only helped for a small amount of time.

i also just went through you thread about the driveability with the q45 so im switching back to stock

 

[adampecush]

You'd need to test it at operating temps to see if it's an issue or not Adam

that's a good point...I'll have to give that a go.

 

[IJ.]

The clearance/leak may close down enough to be a non issue once everything has expanded with heat.

 

[7Mboost]

My Q45 TB didn't leak upon a boost leak test through the throttle body, maybe yours came out of a higher mile car?

 

[grimreaper]

^ meaning yours will