1990 FIAV blockoff??

[LKWTSI]

I have searched this forum and only come up so far with one thread on the 1990 FIAV. I now know the differences between the FIAV's, but don't seem to be able to find anyone who has actually done the blockoff or mod' for the 1990.

So, I'm in the middle of replacing the TB shaft seals and would like to get rid of the coolant lines as you'll all agree they're a PITA.

Anyway, before I go and stick these back on, has anyone done the blockoff for the 1990 TB's and what are the pro's and cons if any??

Thanks

 

[DSMopar]

Did it on my 91, not sure of the differences but it should pretty much be the same, clean out the FIAV and squirt RTV into it, done. Pro's, dead steady idle... cons... idles on the low side when cold, doesn't compensate for A/C as well as before... Well worth it IMO...

 

[LKWTSI]

Thanks for the opinion.

Did you just block off the one port for the FIAV or both.

According to this pic, DSM90AWD blocked off just the one marked #3, I was curious if you did something different.

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[Demon33]

I have searched this forum and only come up so far with one thread on the 1990 FIAV. I now know the differences between the FIAV's, but don't seem to be able to find anyone who has actually done the blockoff or mod' for the 1990.

So, I'm in the middle of replacing the TB shaft seals and would like to get rid of the coolant lines as you'll all agree they're a PITA.

Anyway, before I go and stick these back on, has anyone done the blockoff for the 1990 TB's and what are the pro's and cons if any??

Thanks

Take a look at Sam's post (#19) here. Very informative and for me, enlightening.

In a PM he sent to me:
"For a 90' its even easier, there isnt a freeze plug, just a triangular plate held on by 3 screws, take it off and it the same with the plunger and seat."

If you end up doing it this way, let us know how it turns out. I need to replace my throttle body shaft seals and would do this mod if it works out for you. Hope it helps.

 

[DSMopar]

Yes I only blocked off the inlet side of the FIAV...

 

[LKWTSI]

Thanks folks.

Will be outta town for a couple of days, but will post the results next week once I get the job done. Will try and remember to take pics of the process as I do it.

 

[RipperXX]

Well, 8 months later how is it?

 

[Jankenshank]

^^ hahahaha

 

[Rob10_99]

He's been out of town quite some time it seems.

 

[LKWTSI]

You guys stalking me I should have closed this thread

As for the response. I chickened out. I rebuilt the TB but decided, after reading multiple threads, not to do the block off plate and run the coolant lines and be done with it.

Thanks for keeping tabs on me, though

 

[LKWTSI]

I'm rekindling this thread, as I'm in the middle of pulling the plunger out and closing off the FIAV side of my TB.

So here goes....

I pulled the bottom plate off and cleaned up the chambers. I've taken the ISC out for clarity ( it WILL go back in ), I pulled the "triangle plate off the side where the plunger sits and pulled it out. Now I'm left with what looks like a brass spike inside that's held in place by a dowel pin. From what it looks like it closes off the lower coolant pipe in the picture and the other coolant pipe is somehow recirculated from that part of the TB. I planned on sealing off just the Inlet side of the FIAV as stated earlier in the post, but want to completely make sure I'm plugged all the right areas.


I was planning on dremel cutting the coolant nipples off and plugging the holes, but if I can seal the chambers inside as well I think that'll make sure there is absolutely no air leaks.

So has any one pulled the second plunger out? or do I just leave it and seal off the coolant nipples once I cut them and seal off the inside of the FIAV?

I think I'm on the right tracks, but all the posts I've found and read so far, pertain to 91 and up TB's. NOT the 90. Thanks for the continued help guys.

 

[tsi1991awd]

Yup, I want to know how to do the FIAV bypass on the 90 as well. Can't find anything on it either.

 

[LKWTSI]

Yup, I want to know how to do the FIAV bypass on the 90 as well. Can't find anything on it either.

I may have to restart this post and see if we can get some input. I can clearly see where to block off, but want to know if it's worth gutting the chamber that had the plunger in it. If it is I'll just cut off the coolant nipples and block them and fill the chamber and the inlet and seal it up.

 

[tsi1991awd]

So what are we supposed to block off?

I know we cut the coolant lines off but what part of the TB do we block off? Number 2 and 3 or just number 3 or what?

 

[LKWTSI]

So what are we supposed to block off?

I know we cut the coolant lines off but what part of the TB do we block off? Number 2 and 3 or just number 3 or what?

From what I have come to understand, all you actually have to block off is port 3. But if you look at my new post, you'll see my pic of the stripped down TB. If you take the plunger out you're left with a gaping hole from 2 to 4&5. I did the mod like they talk about on the later models and pulled the plunger out in port 2. Now I have the problem that the plunger is missing the 2 coolant nipples are still connected to the TB, but now you don't have anything sealing off port 2 from the 4&5. So I'm looking at blocking off both 2 and 3 and cutting the coolant nipples off and sealing them off just to make sure. This post seemed to be dead as far as getting someone back on it other than myself and you, so I started a new post. I guess I'll try and keep this one up to date or you can start to follow the answers on my new post. I'll let you know either way as I seal mine off, no matter what the response is to the new one.

 

[tsi1991awd]

On the 91+ it is A HELL OF A LOT EASIER. I did this on my old 91 and all I had to do was sandwich a damn plate between the upper and lower half of the TB and be done with it.

What are you using to seal off the number 2 and 3 ports? RTV? Also, if you take the plunger out and just seal off number 2, I wouldn't think you need to seal the coolant line holes off on the outside since it will be blocked from the inside....??

 

[LKWTSI]

As of yet I haven't been able to get the second plunger out. It's one tough little piece. So as it sits right now, I'm probably going to leave it in there, it doesn't seem to be like it's going to be a concern. I'm planning on filling up ports 2&3 with JB weld and seal the nipples off with the same, purely just for looks.

I wish this was easier for us '90 guys, but ya gotta do what ya gotta do.

 

[tsi1991awd]

Are you going to cut out a piece of sheet metal and JB weld it onto the holes or just build up a nice puddle of JB?

I was thinking of maybe using a metal epoxy then JB Weld over it or something. Dunno.

So you're leaving the plunger in number 2 or what?

 

[LKWTSI]

Are you going to cut out a piece of sheet metal and JB weld it onto the holes or just build up a nice puddle of JB?

I was thinking of maybe using a metal epoxy then JB Weld over it or something. Dunno.

So you're leaving the plunger in number 2 or what?

Yeah, just got done doing it a couple of hours ago. Couldn't get the second plunger out, so I cut the coolant nipples off and filled them with JB Weld. I will sand the stuff down once fully cured and bead blast the TB and maybe paint it. you'll never know they were there.

As far as plugging the FIAV, once you have the end cap off that seals the plunger chamber, I just put some painters tape in there and then filled the hole with JB Weld. Once it's cured I'll pull the tape and add more JB Weld to the backside and fill in the chamber to stop the plugs from popping out. Button everything back up and hopefully call it good.

I've attached a pic of the empty chamber and once I get all the JB Weld done I'll post another to show you the result.

You can see the inner plunger in the lower corner. It was good and solid and I don't think it'll make any difference, now the coolant is gone anyway.

 

[rarest_90_DsM]

I have a 90 eclipse i just went and bought a 94 tb unbolted the FIAV, taped off the inside of the throttle body filled the fiav holes with jb weld, sanded it down got a tps from a 94 and just soldered some wire and the new terminal done runs like a champ and so easy a cave man could do it. Pus the new tps is more common and aesthetically pleasing and the throttle body looks way cleaner done this way

 

[LKWTSI]

I have a 90 eclipse i just went and bought a 94 tb unbolted the FIAV, taped off the inside of the throttle body filled the fiav holes with jb weld, sanded it down got a tps from a 94 and just soldered some wire and the new terminal done runs like a champ and so easy a cave man could do it. Pus the new tps is more common and aesthetically pleasing and the throttle body looks way cleaner done this way

just curious is the later tb's inlet a different size or the same.

 

[rarest_90_DsM]

I used a non turbo tb the non turbo tb is 63mm i believe witch is a little bigger then the turbo throttle body so its a win win

 

[bwhite]

All I did on my 90 throttle body is pull the plunger apart clean it and seal it with rtv, also filling the chamber with the rtv and capping it off with the 3-bolt plate. Done, simple, idles smooth.

 

[LKWTSI]

I used a non turbo tb the non turbo tb is 63mm i believe witch is a little bigger then the turbo throttle body so its a win win

Cool, I'll have to check out my local salvage yard, they had a few non turbo's will have to see if any are left.

 

[HareyCarey]

So, I take it that most of us are considering this a good mod? Albeit not a performance mod really but it simplifies things...and seriously, as far as the 4g63t goes: the simpler and less unnecessary crap, the better.