Coolant line question...

[lowtaco]

Im finally getting the engine finished up but have a question regarding the coolant lines running to the ISC and throttle body. Are these really necessary? Ive heard of peeps unhooking these coolant lines on other vehicles to lower intake air temps. Or do these serve an acutal purpose and need to be left alone? Only reason I ask, mine do need replaced.
-Luke

 

[jdub]

The TB & ISCV coolant lines are there to prevent icing under certain OAT and humidity conditions. Bypassing these lines will not lower intake air charge temps. You can bypass (do not unhook and cap) by connecting a line from the front intake manifold runner fitting to the return line connected to the hard line around the block. Look at his:
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=CO&P=2

Where you live has perfect conditions for intake icing from late fall through early spring. Intake icing will form under extended runs (> 20 min) and you do not have to be in boost. I would think hard about bypassing if I were you.

 

[lowtaco]

Thanks man, I wont be driving it during cold weather anyway but it helps to know.

 

[jdub]

Keep something in mind...intake icing is most likely between 0-10 deg C (32-50 deg F) with humidity above 70% and/or visible moisture (rain, fog etc) present.
It doesn't have to be winter weather for it to happen.

 

[lowtaco]

Even after the engine is up to operating temps?

 

[jdub]

Why do you think the coolant lines are routed to the TB and ISCV? It's not to cool them off.

 

[lowtaco]

Ok just checking:biglaugh: