Throttle body connections

[jopaustu]

While cleaning this afternoon I notice 2 vacuum style nipples on and near the bottom of throttle body. These have nothing connected to them. Should they? What are they for?

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[Phoneguy]

Water lines, mine are disconnected as well.

Bryan

 

[jopaustu]

What was the purpose. Cold weather/freeze protection?

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[earlbrown]

Yep. just a water heater for the throttle body.

 

[jopaustu]

Where would they connect? I'm gonna guess the odd looped hose I have between the coolant lines on p/s. If so what have you guys used other than a kinked heater hose? Something a little cleaner looking perhaps. Thank you, Joe

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[earlbrown]

they run to the hard black pipes running to the heater core. I buzzed mine shut with a MIG.

 

[whitehot1]

Just my .02 on those cooling hoses running to the throttle body.

I have never disconnected them on any of the 6 turbo regals that i have owned since 87. I have lived and driven them in Fla,SC,Oh. for most of the time and they never caused any problems being hooked up. I really don't think you will gain anything by not having them connected unless maybe if you have an all out race car that only gets run on the track.

 

[GNVenom]

The two coolant lines supplement the emission controls; they "pre-heat" the throttle body chamber when the engine is up to temperature. The reason was, heating the inlet air will keep hydrocarbons stable in closed-loop. In practice, though, I'm not sure if they really make a difference. Most GN owners have capped the pre-heat lines off. This was a popular thing to do back when the 160 degree thermostat mod was started.

The engine runs the same with or without that change as far as I can tell.

 

[Jay J]

Just another place for it to leak if it is hooked up, IMO

 

[Phoneguy]

Just another place for it to leak if it is hooked up, IMO

+1

Bryan