jstreet0204 said:Yeah I didn't see that either. I picked this one up about 2 pages in when they were drilling on the tps. For some reason I thought he had replaced the IAC but I must have been confusing it with another thread. If tapping it doesn't work, plug the hose going to the IAC. If the idle drops or dies you know that is your problem.
UDTbadkarma said:- Upon further inspection of the PORTED plenum and FRPP 70mm T/B my instructor and I notice the problem!!!! The FRPP 70mm T/B has a small 1/4 (about) size hole right through the t/b blade. The same hole that guy on page 3 of this thread told me to put in the blade, and the same hole that you guys said not to put in the blade!!! It looks factory though, like the FRPP t/b was supposed to have that hole there or something. ANOTHER problem was that we could get our fingertips to just grap the top of the t/b blade with the t/b in the fully closed position. We could just knick it...something we could not do on the stock one.
svttech76 said:OK that hole would cause the idle to hang high like that. of course the computer can not control idle with the hole there.
patch up the hole with somthing that will not fly off and enter your engine and see if the hanging idle is fixed with the ported TB/PLENUM
jstreet0204 said:First are your sure the hole was as big a 1/4. I have the same frpp 70mm throttle body. I went out and check mine, and it does have a SMALL hole in the blade. Less than an 1/8th inch. I've attached a photo, you can see it right where a the smudge is.
Second, are you changing you IAC valve between the two plenums, or did it come with one on it. If it did, the one on it is probably bad.
UDTBadkarma said:No im not sure of the EXACT size of the hole in the t/b blade.
No didn't change the IAC valve, its the same valve that is on the car, just plugging in and unplugging as i need to, to change t/bs....
SVT TECH I know this is kind of a "no no", but if those gaps are excessive...can i just back off the t/b set screw? My tech school instructor recommended that i take that T/B set/positioning screw completely out, and replacing it with a screw that has a hex or allen key end, so i can adjust it as need be.
What do you think of that idea? If i adjust it, i can have it closed all the way, and then plug up that hole in the blade.
UDTBadkarma said:TPS voltage is .98v at idle.....even with those gaps
Shiroelex said:A TPS is $32 at Autozone, and you can return it if it doesn't cure the problem, as long as you have the receipt. I'm thinking your problem is something else, though. Are you sure all of your gaskets are sealed good? Like that 'reusable' one that goes between the upper and lower? Also, is the inside bored out too big, to where the throttle blade doesn't seal the hole completely anymore? I've seen where the bore was too big, and there was a small gap at the top and bottom of where the throttle blade shuts. Take a peek inside; that might be the problem. Oh, also, if they bored too big, or some metal shavings went somewhere they weren't supposed to; that might cause a problem.
svttech76 said:one problem I see is the hole and gaps combined. it looks to me like you tried to port the T/B and the problem with that is so much material was removed now the T/B blades have gaps. now you have 2 options
1. plug the hole even with it being factory, the purpose of the hole is to allow a little bit of air to enter the manifold with the blade closed. this allows for smoother c/t to p/t or wot operation. all throttle bodies have a hole like that.
BUT with the amount of material you removed you increased the amount of air that is entering the intake with the throttle blade closed. that will cause the idle to stick high. and if you close the hole that will leave just the gaps to allow air in and see if the idle is better then.
2. toss the T/B and get a new one.
also we need to know if you have two different IAC's
UDTBadkarma said:I never ported the T/B. I did not touch the throttle body at all, i mearly put it on the plenum with a custom gasket i made for it. The T/B was given to me by someone else. He bought the t/b and had La Rocca's Performance here in south jersey install it.
I can't toss the t/b and get a new one because i have no money, i'd prefer and WILL find a way to make this one work.... In your #1 Suggestion, are you suggesting i LEAVE the t/b set-screw alone, and just plug the hole in the blade? So this way there is still air going over the gaps in the blade...
...because i think i should mess with the set-screw to close the blad fully, THEN plug the hole in the blade, so everything fits tight again. My stock 65mm t/b does not have a hole through the t/b blade.
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