[Gmecm] Throttle body repair question

[Jake Tucker]

Jay,
	I too had the same problem.  At first I bought a used throttle
body on E-bay hoping it was better.  Unfortunately, it was just as bad
as the one I had, so it didn't help.  However, it allowed me to have it
repaired while I still drove the vehicle.  I went to a local shop that
repaired carburators and they machined it and pressed new brass bushings
in it.  It's the same process that they use to repair old carburetors.
Anybody who still repairs carburetors would have to be able to replace
throttle shaft bushings because all of the carburetors would have the
same problem by now (they're all at least 20 years old).  It worked
pretty well, and now I have a spare stock throttle body.  If yours can't
be machined, or if you want a second one to have machined, you can
contact me off-list at jktucker at usamedia.tv.

Jake

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
Behalf Of John Gross
Sent: Sunday, February 12, 2006 9:25 AM
To: gmecm at diy-efi.org
Subject: RE: [Gmecm] Throttle body repair question


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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