throttle body leak.
 

i have a 98 gst, i installed upper ic piping, upper elbow and lower ic piping from RRE. i boost leak tested it and i heard a hissing from the throttle body area. i have intake, catback, mbc, turbo timer and ic iping and 1gbov. i am running 15-16psi(no more) and i have about that much boost until about 5400rpm and when it goes up to 6 i have dropped down to about 10 psi.... any one have any ideas? i just ordered throttle body shaft seals because i heard they can leak really bad. and i have to brand new thottle body gaskets so i hope that should fix it. any pointers on changing the tb seals? anything i should be aware of?

RE: throttle body leak.
 

Permatex!

RE: throttle body leak.
 

Mike had a great write up on taking the TB apart in our FAQ, go check it out.

RE: throttle body leak.
 

here ya go. its pretty simple. the seal can be alittle bit of a pain, but taking the TB apart is easy
https://mitsubishiforum.com/m_104128/tm.htm

RE: throttle body leak.
 

sebba, what is permatex? lol

RE: throttle body leak.
 

That's the brand name of the gasket making/sealing stuff.

RE: throttle body leak.
 

oo haha i feel dumb.

RE: throttle body leak.
 

those seals where a pain to get out and a pain to get in. lol. everyting is on tb is back together correctly. so just bolt back up with all new gaskets and seals should hold my 16 psi??

RE: throttle body leak.
 

yup you should be all set. Told ya it was a bit ofa pain. Did you try using the socket to bang the seal in? Cuz i found that to work easy. And dont forget to make sure you turn the spring on the throttle so that its at the right tension. And also you may have to adjust the TPS with the bolt to make sure its correct for idle

RE: throttle body leak.
 

yeah. at first i thjought the spring was tight enough, of couse i was wrong lol. so i took it back off and tightened it and now that part is fine. and the first time the hose under the tb was kinked anyways so im glad i fixed that. my idel is around 950. if i adjust the tps should that fix my idel? and yeah i tried that and then i just used the end of a screw driver, that worked the best.

RE: throttle body leak.
 

and permatex smells bad lol. i had a brand new tube that i forgot about so i used it.

RE: throttle body leak.
 

okay so i messed around with the tps and i cant get my idol any lower then 900rpm. on a warm start up itll be like 750 to 800rpm and then after i hit the gas it wont drop down past 950rpm, and also i have a little play in the gas pedal. is there anyway to fix that?. and ive always had that and it was fine. but i want to fix it becasue its anoyying now.

RE: throttle body leak.
 

it sounds like your throttle cable needs adjusted

RE: throttle body leak.
 

how do i adjust it?.

RE: throttle body leak.
 

theres 2 bolts on the back of the intake manifold, loosen them and pull the cable/bracket whichever way it needs to go.

RE: throttle body leak.
 

Either that or like i said in the begining, make sure you wound up the spring on the TB that the cable connects to. It is probably one revolution off.

RE: throttle body leak.
 

yeah, it was when i first put it on i was pissed. lol. then tightened it up again. i dont think the iinner spring(green one) is the same tightness. should they be equally tight?