Idle Problem After Ported TB
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On The Tree
Joined: Nov 2001
Posts: 161
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From: Delaware, OH
Idle Problem After Ported TB OK, so I had my TB ported and polished, but holding it up to the light, I can see spots around the plate where there would be some air coming through. I put the TB back on the car and started it up. Too much air coming in, it idled very high, around 1600. So I filled the hole in the plate with JB Weld and drilled it out smaller the next day. Nope, still too big, now it's down to 1100 or so. So I fill it one more time, this time I decide NOT to drill the hole out. I put it on and it idles much better, around 900. So I take the car out and it's fine. Next day I take it out and it idles strange. It idles at 1500 - 2000 and slowly comes down to 900. And now I'm throwing an SES light as well. 
Should I have at least drilled a small hole in there? I am having it looked at via Autotap and LS1Edit this Saturday, but what should I do about that hole? Should I drill it back to stock size or what? Any other thoughts?
Should I have at least drilled a small hole in there? I am having it looked at via Autotap and LS1Edit this Saturday, but what should I do about that hole? Should I drill it back to stock size or what? Any other thoughts?
Re: Idle Problem After Ported TB I would remove the IAC motor and check its
plunger and the milled face against which it
seats, for any little "bonuses" from the
porting and coating work. Also be sure the
O-ring in the intake manifold is clean and
still giving a good seal to the TB back face.
And, make sure the "light gap" isn't due to
something simple like the idle stop screw.
A port job should stop short of the blade
seating circle and there should be no gap,
but I guess that comes down to craftsmanship.
plunger and the milled face against which it
seats, for any little "bonuses" from the
porting and coating work. Also be sure the
O-ring in the intake manifold is clean and
still giving a good seal to the TB back face.
And, make sure the "light gap" isn't due to
something simple like the idle stop screw.
A port job should stop short of the blade
seating circle and there should be no gap,
but I guess that comes down to craftsmanship.
