[Gmecm] Throttle body repair question

[John Gross]

I had that problem a few years ago on my TPI vette.  The TB had ~200k miles
on it.  If the only wear is around the outer bushings, you can repair it by
milling a pocket in the TB around the bushings and placing bearings in the
TB (go for a *light* press fit and use green loctite to retaining them).  If
the center bushing is worn, you're SOL in my experience.  Mine worked well
with the bearings until the center bore wore out, and there's no good way to
install a bearing there.  That was the cause of my throttle binding, as the
throttle shaft was bending just enough from the manifold vacuum to bind the
throttle blades against the bores. You can usually find someone on the
corvette forum or the 3rd gen F-body forum who has a spare stock 48mm body
after upgrading theirs.

Hope this helps.
John

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Jay Melton
Sent: Sunday, February 12, 2006 11:43 AM
To: gmecm at diy-efi.org
Subject: [Gmecm] Throttle body repair question

This is GM EFI, not specific to ECM, but pertinent.  Has anyone ever
repaired a TPI throttle body or had one repaired?  I have worn throttle
shaft bushings, allowing some air leaks and occasional inconsistent closing.
I have contacted a couple of places, either no reply or a negative answer.

Any experience or ideas on this?

Thanks,

Jay Melton


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