joseph p

If I don't hook the water lines to the throttle body on an '89 TPI engine, why do I have to connect them to each other? Can I plug them?
Can I cut them off? I'm using this engine in a hotrod, stock with ECU and all proper wiring. I would like to clean up the appearence of the engine as much as possible.
Thanks

Ruff Rider

I would think that the coolant needs to circulate, I wouldn't plug the hoses, but then I'm no expert.......

BADDUCK

Coolant is in a loop through the throttle body, heater, engine and radiator. You plug it and you are screwed.

N.C Punk

Why?

BADDUCK

Look up the word loop.

N.C Punk

Yea we already know that....

There already is a loop. the water pump has an inlet and an outlet both on the engine side and radiator side. So, why is this throttle body hose SO important?

MikeC4

For clarity, the throttle connection is a "redundant" or "tapped" loop, and if it is caped off, so to speak, no problems. This is not rocket science.

Anyway, this is how it works on a '93 :

Sam Lam

NCPunk: If I read your posting, you are wanting to remove the hose that connects the heater and throttle body to the cooling system. You can remove this "loop" without any problems assuming you modify the throttle body inlet and outlet point of the coolant system.

Here is a photo of how to bypass the throttle body (clean up) on a 89 Vette engine:



Do it

N.C Punk

Your right it's not.

Oh, did you get that room yet?

Aardwolf

You can plug them if you wish but then your heater core isn't going to make a whole lot of heat. As there will be no coolant going through it.

I made a new line instead of adapting the hoses together. It looks much neater tucked away then crawling across your V/C. I also buzzed off the fittings on the TB so they didn't stick out looking fugly.

MikeC4

Like I said, If this is CFI-EFI, then I am booking the Penthouse suite at the Waldorf Astoria:



but what are the chances.......

Aardwolf

jimg's'93

I bypassed my TB on a '93 LT1 using a blend of '93 and '95 hoses that looks beautifuly stock. No problems at all and she still pumps out great heat in the colder months. Just my 2 cents.

joseph p

Perhaps I didn't state my situation clearly....I put an '89 Corvette 350 TPI into a '39 Buick. I rerouted the heater hoses directly from the engine to the heater as they would be in a '60's car. What I need to know is whether it matters if the throttle body outlets which are no longer being used, need to be capped and if not could I even cut them down for appearence and clearences?
Sorry for the confusion, thanks for all your interesting responses.

TOMS93

You can cut them flush.

BADDUCK

I capped mine off with black vinyl caps. You can cut them back and/or plug them. Worded much better!

Ruff Rider

This is good Info, Got A Pic.???.......

joseph p

Sorry for the confusion...I think I'm going to cut them off and plug only the passenger side one.
Thanks for all your quick, helpfull responses.

N.C Punk

Now was that so hard.... My guess is that this stuff is like rocket science to you

steven mack

I always thought heater cores had two lines one in one out . Thats why you need the loop in a vette.