Technical Tips > Post 84

Throttle body bushing - David Koldos

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Stingraynut:
The bore for the throttle blade shaft in my 88 is worn and the pressure of inrushing air when the engine is running, even at idle, makes the throttle stiff and sticky.

It's a fairly well known problem of the metal shaft wearing an oval bore in the aluminium TB because there's no bushes.

I spray grease into the shaft bore every 12 weeks which makes it smooth for a while.

Yesterday I contacted David Koldos in the US from a link on the Corvette Forum - he fits sealed bearings to the shaft,

His reply was quick and he's quoted US$145 for the work and $20 for shipping - very reasonable prices I think.

He seems to have a good name on the forum, but I'm just checking here to see if anyone has used him or knows anything ?

thanks

Stingraynut

Thunder Kiss:
Never heard of him, but then I don't really spend too much time on any overseas forums.

I have a similar problem to yourself (maybe not as bad though) so I would also be interested to find out a little more.  Would it be easier/better to purchase a used trottle body in the USA and have it shipped directly to him for rebuilding?  Less down time that way, although I guess it would depend on what a used throttle body sells for.

The other question, what's a new throttle body worth?

Stingraynut:
Hi Thunder Kiss, that's a brilliant action pic you have there.

David is going to send me a rebuilt TB and then I post mine to him, no core charge, he says "No core fee, I used to charge one but the logistics of returning it just wasn't worth the trouble. It seems that if people go to the trouble of searching me out, they're of the personality not to screw me out of a core. Also, I've been doing business with the cvette forum people for years now, great people to do business with.
 
To be 100% sure on application, it would be wise to get a couple of photos from the throttle linkage and opposite side of the throttle body. The early vettes used a couple different styles as far as vacuum fittings on the side opposite the throttle linkage."

As my 88 is my daily driver I have to minimise down time - I had been looking for a TB to buy or borrow for about 18 months - now I don't have to bother.

At first I thought the sticking throttle was my cable, so I replaced it - that's when I found out that the suction from the motor causes the shaft to bind in the oval  holes it has worn.

I'm reallly looking forward to a smooth throttle!!! Sealed bearings will be better than original.

Like you, I try to source parts from Aus, this forum is great for that but it's not always possible.  The Corvette Forum is very useful for info, providing you realise that some people post first and think later - I look for a concensus of opinion and weight replies from the known good guys.

Work done on my vette so far - http://www.users.bigpond.com/mphealey/Corvette/Maintenance.htm

S'nut

Thunder Kiss:
I checked out your website, Stingraynut and all I can say is, "What a sweet ride."



With regards to your computer turning the fan on at 116 degrees, I was under the impression this only happened as a fail safe if the fan switch in your engine block dies.  A standard fan switch should turn the fan on at around 109 degrees and you can buy lower temp fan switches which come on earlier.

86er:
Hi Guys,
Have you thought about an aftermarket Throttle Body.
New in the States they are $299.00 US

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