ooooooooooooookay, i just did the throttle body mod on my friends 88 TII. i did it in full and it is all correct. i have checked it over and over again comparing meticulously against RETed's (www.fc3s-pro.com) "how-to". i eliminated all the solenoids except the twin-scroll solenoid. . . i left that in tact. i eliminated the acv and the egr. the bacv is capped off and unplugged. when i was putting everything back together i noticed the wire for the O2 sensor had been cut (on the harness side of the connector). . . the harness is waaaaaaaaaaay chopped up and i cant match-up the "for sure" correct wires. could that be the reason for the high rpm idle. . . i figured it was a leak in the intake, but i cant find it. im iffy about the following: unplugged bacv, O2 sensor connection, and the nipple on the inside of the LIM that points AFT (i plugged that up cause i didnt know what could have connected to it).



there is a bit of smoke emitting from the turbocharger. not sure what that is either. . . but i noticed when i was working on the car that on of the LIM mounting bolts is missing. thats pretty cool huh. i think somebody did one hell of a chopped up engine replacement job. THIS THING IS CHOPPED UP!!!



i could use some help.



paul

 

your high idle is definatly a vaccuum leak. unless the idle goes down after the car warms up......

 

well seeing as how it takes a while to warm up i dont want to wait that long to find out. that high of an idle CANT be right. thats sickening. my fd didnt do this at all. you know, i wonder if the TB gasket is bad. it was all in tact, but it could not be sealing right ya know.



oh, and when i changed the UIM/LIM manifold gasket i noticed that the LIM was a little bit chopped. nothing too bad though. i dont think it could be the culprit at all. my question is: if the LIM mounting bolt (to the block) has been missing this whole time then why is it idling like this now?



im hoping i got the twin scroll set up right. my buddy comes back in town on saturday so i might try to talk him into letting me remove the twin scroll and replace all of his turbo related gaskets.



i wish i could feel where the leak was coming from. . . but that damned top mounted ic is all in the damn way.





i need to just stick to FD's!!!! hahahaha



paul

 

thats a really high idle, since you say you've done the TB mod I'm assuming that you have eliminated the thermowax portion of the AWS? It's the thing that gets the coolant by the throttle body and has a plunger an cam that will keep the throttle open til the wax melts (coolant heats up) progressively closing the throttle up til at normal idle... if it's still there it might be sticking.... or you may have left it on with the coolant removed so it will never melt?



You should be able to just see if the throttle is closed fully and know wether it's a vacuum leak or the throttle stuck open, it's gonna need a decent amount of air for that rpm.... take note of the closed position on the throttle and see where it sits when it's idling that high, if it's closed the air is coming in from a vacuum leak.



heres a vacuum diagram for the t2:

http://pengaru.com/~swivel/cars/rx-7/t2vacuum.jpg



also, that missing bolt from the manifold can be the source of so much air, replace it, air may be leaking at the gasket because the bolt is gone.

 

use a vacuum hose and probe with it, it works great for detecting leaks.

 

okay, i just talked to a good t2 friend of mine. he said that the o2 sensor wire has a braided jacket around it. he said that it wont operate properly if the braided wires are spliced into the inner wire. so im gonna redo that. i cant check out the throttle position right now because of the lack of light here in tennessee right now. i guess ill hit it tomorrow.



thanks,

paul



oh, i also adjusted the TPS. . . so thats out of the question too. i adjusted it to 1k ohm at closed and it read like 4.3k ohm at WOT. i read specs on it and that seems to be within spec.