What is this part? 1991 GTS - Toyota Nation Forum : Toyota Car and Truck Forums

ONEBADBUG · 08-09-2010, 02:52 PM

Recently picked up a 1991 Celica GTS.

At first I thought these were the tubes that went to the heater core as far as I can tell they emminate from what I see as the water-pump as the radiators large feed hose being connected to it... but there are also 2 small two metal pipes that are routed out of its side that run between & under the exhausts manifold going down & between the blovk itsel and make a turn and go around the block and dive back into oblivion...

At first I thought the were the feeds for Heater core... then I thought possibly there we part of the evaporation lines (as odd it may seem) but none the less I caught them one day after a bout a 20 mile drive after getting this beater and am just trying figure out what the heck they are! ... Fluid in the radiator is as green as it can be... and what was coming out of it was brown...

Tried calling the dealer and all I get asked as ... Metal pipes? there are no metal pipes coming fro the water pump... either that I have the worst Toyota's parts manager on the planet...

Anyone have a clue as to exactly what they are so I can order the correct part?

Thanks...
Gene

***MR2Jedi*** · 08-09-2010, 04:09 PM

Looks like bypass lines for the throttlebody.

***MR2Jedi*** · 08-09-2010, 06:12 PM

If you have the 5sfe:

16268 PIPE, WATER BY-PASS, NO.1
16268-74010 5SFE..ST184..NOB; 5SFE..ST184..WIB..ATM 1 ...............................$160.19
16268-74170 5SFE..ST184..MTM 1 .................................................. ................. $82.68

ONEBADBUG · 08-09-2010, 09:41 PM

Ok... took the time today to find exactly where the little leak is coming from...

If I have to guess it looks like the pre heater pipe for the EFI setup that comes up along the bottom of the throttle body?

IF I'm wronfg let me know ... if you know what it is... let me know if you can..

Thanks..
Gene

***MR2Jedi*** · 08-09-2010, 10:16 PM

I believe that goes to the heater core. That would explain why it barey leaks. I imagine your not using your heater right now, so the heater core is closed and not flowing coolant.
Someone else needs to confirm this though.
Can you not feel where it leads? If it goes thru the firewall, it probably is.

ONEBADBUG · 08-09-2010, 10:53 PM

Quote:

Originally Posted by MR2Jedi

I believe that goes to the heater core. That would explain why it barley leaks. I imagine your not using your heater right now, so the heater core is closed and not flowing coolant.
Someone else needs to confirm this though.
Can you not feel where it leads? If it goes thru the firewall, it probably is.

Tried visually tracing it.. Forget it... no way any hand fitting in there to even think of feeling it around... Could barely even get a 12" screwdriver in there to actually finally find the stupid intermittent leak.

Started soaking up the bolts and clamps for the air handler/intake and simple unbolt components to move them away to see if I can see where it actually goes. Must be at least half a dozen hoses running through there in even more directions... WHICH WAY IS UP!?!..

Like I said from what I could see it dumps down and then does 3 bends and looks like it runs right under the throttle body...If thats the case... it's the goofiest thing I've ever seen for a TB body pre heater I've ever seen

If I'm even luckier... all I'll need to do is snip 5/8" off the hose and re-clamp it ...but with the way it looks and the fact there didn't seem to be much slack in the hose replacement will be the sensible fix...

Fingers crossed...

ONEBADBUG · 08-14-2010, 07:46 AM

Hmmm... Kinda funny...

Went to NAPA, Autozone, carquest and so on... they didn't know what it is... even went to the Toy dealer and they didn't have a parts breakdown for a 1991 GT-S to determine what it was... WTF!!?? Screw it.. lopped off 5/8" off the end of the hose and put it back on with a new clamp and leak fixed...

Pretty sad when the Toyota dealer cant even determine what the hose is...

93celicaconv · 08-14-2010, 08:56 PM

Pretty sad.

That hose is connected to the water outlet housing (the housing where your sensors are mounted, and where the large hose goes to the radiator, which is the hot side, or coolant inlet side, to the radiator).

That hose goes to your IAC (idle air control) valve. There is another coolant hose coming from your IAC valve that connects to one of those metal tubes you mentioned earlier.

The IAC valve uses coolant temperature to help control engine idle speed (faster when cold, slower when hot). The ECU fine-tunes the idle speed to try and maintain 750 RPM when hot, but the coolant temperature provides the gross idle control.

Does this help?