Throttle body and ISC heating

[Mr. Y]

Hello!
I'm gonna to block coolant lines, that go to ISC valve and from throttle body to avoid useless unreliable hoses. Have somebody done that?
So, should I expect some troubles? May be in cold weather? (I'm in Russia, and sometimes it is very cold here ;-)

What for Toyota engineers decided to heat ISC valve and throttle body?

Thank you for anwers and for opinions.

 

[ma71supraturbo]

It's for cold-start emissions, and no I've had no problems bypassing them

 

[Mr. Y]

2 ma71supraturbo:
Ok, I see. But another Q: should I bypass or I just can block them off?

 

[MDCmotorsports]

Run a hose from the front coolant barb to the rear coolant barb. Bypass the throttle body. Do not bypass the ISC. Your car will be forever stuck on high idle (or so I am told) if you do.

 

[Mr. Y]

2 MDCmotorsports:
one minute, please. Are you sure? If you are, looks like supra's brain is not very smart. I thought, that ECU reads coolant temp using sensor and set idle speed. Is not it? Or idle speed is set not electronicaly but machanicaly? I am disappointed...

 

[lagged]

Run a hose from the front coolant barb to the rear coolant barb. Bypass the throttle body. Do not bypass the ISC. Your car will be forever stuck on high idle (or so I am told) if you do.

bulllllllllllllllllllllllllllllshit.

take a coolant hose from the water around the block hardline and stick it on the water nipple under the intake manifold. BAM youre done.

 

[90T04]

I have had my throttle body and ISC valve bypassed for two years now, no problems, no high idle either.

I dont think the heat or water circulation has anything to do with the idle speed. Correct me if I am wrong.

Ryan

 

[MDCmotorsports]

I stand corrected. Like I said, it was just what I was told.

 

[CPT Furious]

Both are bypassed, no issues...

 

[boostedj]

The purpose of the coolant passing thru TB and ISC on any vehicle that has it is to keep them from icing up in cold climates, as they tend to get a condensation build up beween hot and cold cycles. This is the reason for it yet I have never heard or seen such a thing happen. You should see no ill effects come from this, but in the Russian winter if the throttle starts to act weird or sticky in any way just reconnect it until spring.

 

[Mr. Y]

Ok, thank everyone for replies.
SupraMania ruleZZZ =)