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[ion] C2 · 09-02-2018, 03:25 PM

So the throttle plate shaft itself is leaking air when I boost leak test. You know how you open the throttle plate by manually moving the part the cable is connected to? If I wiggle that my air leak changes significantly. It's apparently leaking air between the shaft and the main body of the housing.

From some Googling it sounds like there's a bushing that is worn that causes this. Anyone know a place to send it to that can do a good job on a rebuild?

I'm still working on having a bigger custom manifold made with a used 75mm throttle body that hopefully doesn't have this problem, but I'd like to fix this in the meantime.

09-02-2018, 03:25 PM	#1
[ion] C2 636 whp Join Date: Aug 2006 Location: AZ Posts: 11,876	Throttle Body Vacuum/Boost Leak So the throttle plate shaft itself is leaking air when I boost leak test. You know how you open the throttle plate by manually moving the part the cable is connected to? If I wiggle that my air leak changes significantly. It's apparently leaking air between the shaft and the main body of the housing. From some Googling it sounds like there's a bushing that is worn that causes this. Anyone know a place to send it to that can do a good job on a rebuild? I'm still working on having a bigger custom manifold made with a used 75mm throttle body that hopefully doesn't have this problem, but I'd like to fix this in the meantime.