Vertical Fitting Under Throttle Body-1990

Benesesso · 04-01-2006, 09:43 PM

Anyone know what the vertical rubber hose fitting right under the throttle body connects to? I can't find any rubber hoses that fit it, can't see it (if it has one) on my other (1988 Turbo) Supra.

A 1987 service manual *seems* to say it's a water hose fitting--1 of 2 that go to the idle speed control (ISC) valve.

ddmcse · 04-01-2006, 10:06 PM

it is water

that connects to a hose the runs through the intake i forget exactly where it comes up from

http://www.cygnusx1.net/supra/librar...10/2211_2.html

lol this diagram is no help .

there should be a hose that comes up intake side in the mess of manifold

ddmcse · 04-01-2006, 10:13 PM

i think i found it

http://www.ddmcse.com/turbo/images/remright.JPG

it's not the one dead center it's the one close to the wiring harness

see it right there next the tps connection ? the hose looks like it's been clamped thats the one

thats one reason why i took pictures .

Benesesso · 04-01-2006, 10:48 PM

I see it plain as day on your car, but I can't find it on mine. Not on the car, my parts shelves, or the 1988 either. But it's obvious that my 1990 HAD the hose on there, because the metal fitting is clean and shiny.

Can you determine where the other end goes? The ser. man. says something about a "water pipe"--a real big help.

Benesesso · 04-02-2006, 01:10 AM

Found the hose--had to use a mirror to see it. Then had to pull the plenum back off to get to it. What a pain this car is.

ddmcse · 04-02-2006, 02:48 AM

the engine in the car is a pain in the ass .

the car is a dream to drive and that must be why we keep them

Benesesso · 04-02-2006, 03:17 AM

True, but I don't know why the gas mileage is only around 21 mpg. I have never worked on a more difficult car before. It obviously wasn't meant to be serviced much, at least with the engine in the car.

I'm making a few changes to make the turbo-side a bit easier to reassemble. There is one stud on the downpipe that is very hard to reach and turn so I'm going to cut it off, drill it out and replace with a stainless bolt/nut.

I had planned on welding or brazing some fittings on the turbo oil lines, but now I think I'll just braze them back w/o the fittings. I'm not sure that it would be much easier to turn the fittings as to get to the bolts in the block. If the temp. wasn't so high in the area I use a length of good viton tubing so I could pull the turbo easily, but it's just too hot there.

BTW, the small oil-supply line is carbon steel but the big corrogated return is stainless.

Benesesso · 04-03-2006, 03:05 AM

After I re-lifted the plenum, and seeing how difficult it would be to attempt to reinstall that little 8 mm water hose to the "vertical fitting", I used a long piece of 5/16" fuel tubing and ran it down the side of the block. I used a double-ended barbed metal connector to join the two rubber hoses several inches under the plenum, where it's fairly easy to reach AFTER the plenum is back on.

I now realize that stripping the head bare while in the car was a real dumb thing to do. While I would NEVER do this BHG repair again this way, I'll have to think about how difficult it would be to pull the head with the turbo and intake manifold still on.

04-01-2006, 09:43 PM	#1
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	Vertical Fitting Under Throttle Body-1990 Anyone know what the vertical rubber hose fitting right under the throttle body connects to? I can't find any rubber hoses that fit it, can't see it (if it has one) on my other (1988 Turbo) Supra. A 1987 service manual seems to say it's a water hose fitting--1 of 2 that go to the idle speed control (ISC) valve. Attached Thumbnails __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

04-01-2006, 10:06 PM	#2
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	it is water that connects to a hose the runs through the intake i forget exactly where it comes up from http://www.cygnusx1.net/supra/librar...10/2211_2.html lol this diagram is no help . there should be a hose that comes up intake side in the mess of manifold __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS Last edited by ddmcse; 04-01-2006 at 10:10 PM.

04-01-2006, 10:13 PM	#3
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	i think i found it http://www.ddmcse.com/turbo/images/remright.JPG it's not the one dead center it's the one close to the wiring harness see it right there next the tps connection ? the hose looks like it's been clamped thats the one thats one reason why i took pictures . __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS Last edited by ddmcse; 04-01-2006 at 10:19 PM.

04-01-2006, 10:48 PM	#4
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	I see it plain as day on your car, but I can't find it on mine. Not on the car, my parts shelves, or the 1988 either. But it's obvious that my 1990 HAD the hose on there, because the metal fitting is clean and shiny. Can you determine where the other end goes? The ser. man. says something about a "water pipe"--a real big help. __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

04-02-2006, 01:10 AM	#5
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	Found the hose--had to use a mirror to see it. Then had to pull the plenum back off to get to it. What a pain this car is. __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

04-02-2006, 02:48 AM	#6
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	the engine in the car is a pain in the ass . the car is a dream to drive and that must be why we keep them __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS

04-02-2006, 03:17 AM	#7
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	True, but I don't know why the gas mileage is only around 21 mpg. I have never worked on a more difficult car before. It obviously wasn't meant to be serviced much, at least with the engine in the car. I'm making a few changes to make the turbo-side a bit easier to reassemble. There is one stud on the downpipe that is very hard to reach and turn so I'm going to cut it off, drill it out and replace with a stainless bolt/nut. I had planned on welding or brazing some fittings on the turbo oil lines, but now I think I'll just braze them back w/o the fittings. I'm not sure that it would be much easier to turn the fittings as to get to the bolts in the block. If the temp. wasn't so high in the area I use a length of good viton tubing so I could pull the turbo easily, but it's just too hot there. BTW, the small oil-supply line is carbon steel but the big corrogated return is stainless. __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

04-03-2006, 03:05 AM	#8
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	After I re-lifted the plenum, and seeing how difficult it would be to attempt to reinstall that little 8 mm water hose to the "vertical fitting", I used a long piece of 5/16" fuel tubing and ran it down the side of the block. I used a double-ended barbed metal connector to join the two rubber hoses several inches under the plenum, where it's fairly easy to reach AFTER the plenum is back on. I now realize that stripping the head bare while in the car was a real dumb thing to do. While I would NEVER do this BHG repair again this way, I'll have to think about how difficult it would be to pull the head with the turbo and intake manifold still on. __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

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