1G Boost Leak at Throttle Body, recommendations?

[Panchoelkatch]

Found a huge boost leak coming from the throttle body area (Guess that explains my full boost coming in near 6500 RPM, if I was really even hitting full boost.) Anywho, wont go past 10 PSI with my 120 PSI Compressor, because of this TB leak. Well I've researched and found that the TB Shaft seals go bad and start leaking after some time, so my TB is off the car.

Its a 1990 Throttle Body so, it's different than the other TB's that Ive seen. My question is, have you guys had any luck using O-Rings as replacements for those seals? Were you able to get rid of these leaks using O-Rings?

Any tips on installing the throttle body Gaskets (2)? I ask because, I was thinking about maybe putting down a very thin bead of RTV than laying the gasket down, anyone had any luck with that?

Thanks, and any other tips on rebuilding this TB would be awesome, because I can't find a write-up for the 90 Specific TB!

 

[1990dsmkid]

The only difference in rebuilding is the seals. It comes apart and goes together like the 91+. Ive used rtv with gaskets and it works great. You can buy everything needed from Tim Zimmer at tmzperformance. Its where I ordered all my parts when I rebuilt my 90 throttle body

 

[Panchoelkatch]

Really because all the guides seem so much different than mine. Like the TB shaft has a C clip on it, and haven't seen anyone else talk about a c clip to take the shaft out.

 

[1990dsmkid]

https://youtu.be/xqT5h0sMX4U I watched this video

 

[Panchoelkatch]

Nevermind I got it haha. Did you use OEM seals or O-Rings? I checked that TMZ website, but only found Rebuild services.

 

[pauleyman]

Throttle body shafts shouldn't leak so much to cause what you're seeing. My guess you have another leak and/or an additional problem

 

[Panchoelkatch]

I'm not in a Hurry So I want to order the best stuff.

 

[1990dsmkid]

I ordered replacement seals. Email and talk to Tim. Thats who I dealt with and got what I wanted.

 

[Panchoelkatch]

Well when I Did the boost leak test I had an obvious leak from the throttle body, I found some tiny holes at the Mani elbow. I Just resealed the welds with some jb weld. I could pressurize my system past 10 LBS, and it would completely go to 0 in about 5 seconds.

 

[Panchoelkatch]

These are the seals that I need. Just for future reference, in case someone else runs into a similar Problem.

3030 CR 8x12x3 HM4 R
3930 CR 10x14x3 HM4 R

Now, I'll just figure out where I'm going to order them from.

 

[Panchoelkatch]

Would I be better off just grabbing an S90, if I might be something I might need down the road?

 

[pauleyman]

What is the car doing?

 

[Panchoelkatch]

Maxed Out Rich At WOT, and Very late spool up. So I brought it in and started tearing her down.

 

[pauleyman]

I suspect you have an additional bigger leak.

 

[Freddyk79]

Is it possible for the TB to not close all the way and leak thru the fins themselves?

 

[Panchoelkatch]

Does anyone have an idea of where I Could purchase those seals I mentioned above? I want 2 of each, I just can't find them anywhere?

 

[Chumpaumpalumpa]

Ordered mine from Tim as well. Install went well. Just mark everything they way it came out.

 

[Freddyk79]

Are you talking about the throttle body shaft seals?

Www.extremepsi.com has em

 

[Chumpaumpalumpa]

Are you talking about the throttle body shaft seals?

Www.extremepsi.com has em

He has a 90

 

[Panchoelkatch]

Just checked. I could only find 91-99

 

[1990dsmkid]

Email Tim at [email protected]. He has everything you need like I stated before

 

[luv2rallye]

Try twicks69: http://www.dsmtuners.com/threads/throttle-body-shaft-seal.394103/#post-152484314

 

[Chumpaumpalumpa]

Try twicks69: http://www.dsmtuners.com/threads/throttle-body-shaft-seal.394103/#post-152484314

For clarification to OP, twicks69 is Tim.

 

[mattduncan93]

Just for clarification twicks69 is Tim from tmzperformance.com and I am rebuilding my 90 tb as well. I emailed him asking about the seals and he replied saying he has the parts for the 90 tb rebuild along with the different faiv gasket. He has everything you need.
Here is everything he sent me;
BISS Screw
BISS Screw Cap (1G)
BISS Screw O-ring
1990 Throttle Body Inner Gasket
1990 Throttle Body Outer Gasket
1990 Idle Speed Controller O-ring
1990 FIAV Gasket
TB Shaft Plate Screws

 

[Panchoelkatch]

I've emailed him, just waiting for a reply.