throttle body repairs
Pro
Joined: May 2005
Posts: 510
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From: crofton maryland
only thing i have seen is on the dreeded eBay, but what they do is take the 48mm to a 52mm but they have to replace the guts to do it. but some have said a 52mm in a stock L98 will actully hurt performance. so there you go? and it seems most of the aftermarket ones are the bigger 52mm too.
you can try rockauto.com for a new one.
you can try rockauto.com for a new one.
Team Owner
Joined: Jan 2003
Posts: 20,297
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From: Summerland B.C. Canada
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Dunno about leakage problems, but I do have problems with the throttle hanging up just above idle. Seems like the heavy vacuum is bending the throttle shaft and causing the butterflies to bind.
Thread Starter
Instructor
Joined: Jan 2003
Posts: 233
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From: IL
reply
Originally Posted by AGENT 86
Instructor
Joined: Jun 2002
Posts: 231
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From: 80/680 junction Ca.
My 87' did the same thing. The shaft had play for and aft and it would allow air to sneak around the plates, it did'nt really leak at the shaft, it was strange. I found a used one with no play and it's all good now. It would idle high and if I snapped the thottle it would sometimes drop back down. you could move the shaft forward with your hand and the plates would seat in the bore and the idle would drop.
The first picture is with the shaft in the forward position seated against the bore. The second is with the shaft moved back, you can see the original position, it is now unseated, the vacuum would pull it this direction and allow the air to leak around the plates.
The first picture is with the shaft in the forward position seated against the bore. The second is with the shaft moved back, you can see the original position, it is now unseated, the vacuum would pull it this direction and allow the air to leak around the plates.
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Burning Brakes
Joined: Feb 2000
Posts: 824
Likes: 2
From: Camden SC
Hello all,
Grab a phone book from the nearest large city, head for the yellow pages, "carburetor". Some of these shops will replace with a bushing or bearing.
Another tactic, "Machine shops".
Try any speed shop and see if they will recommend anyone who repairs throttle bodys.
A non modified engine probably doesn't need a enlarged throttle body.
I suspect they will repair the shaft with no other modification.
Good luck with this repair.
dlmeyers 90 coupe zf6 3speed shocks
Grab a phone book from the nearest large city, head for the yellow pages, "carburetor". Some of these shops will replace with a bushing or bearing.
Another tactic, "Machine shops".
Try any speed shop and see if they will recommend anyone who repairs throttle bodys.
A non modified engine probably doesn't need a enlarged throttle body.
I suspect they will repair the shaft with no other modification.
Good luck with this repair.
dlmeyers 90 coupe zf6 3speed shocks
Instructor
Joined: Aug 2004
Posts: 111
Likes: 0
From: Wentzville MO
throttle body
I fixed my 92 throttle body with a $2 spring from Autozone. Just trim the spring and when it gets stiff enough to snap the throttle closed you get instant 800 rpm when you lift your foot.
Thread Starter
Instructor
Joined: Jan 2003
Posts: 233
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From: IL
Originally Posted by black85vette
Does any one out there repair throttle shaft leak problems aka bushings? I have an 85 and it needs it bad!
Instructor
Joined: Oct 2005
Posts: 143
Likes: 0
From: Lincolnshire,ENGLAND
Originally Posted by CentralCoaster
Dunno about leakage problems, but I do have problems with the throttle hanging up just above idle.
I have some play in my original throttle body but this is not the cause, i installed a new throttle body-still same problem.
A mate of mine has an 87 with over 150,000 miles, original T/B, and it idles rock solid at correct rpms!
Still cant find the cause-tried everything i can think of-
Vac leaks, Iac, tps, base idle, cts, throttle cable, ecm signals, ect.ect.ect.
I see some of the other forum members with the same problem installing extra/bigger T/B return springs.Think i'll be looking at doing this next.
Team Owner
Joined: May 2002
Posts: 24,337
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by AGENT 86
David Koldos will install bearings in the TB and bore it it 52mm if you like.
dkoldos@ameritech.net
dkoldos@ameritech.net
