Throttle Body Vent Tube Question
#1
Throttle Body Vent Tube Question
I have a LQ9 swapped 92 Firebird and I got a new throttle body without the vent tube. My previous therotle body had a vent tube and the vent tube was connected to this part towards the passenger firewall. I'm not familiar with this part circled in the picture, can I cap this off since my new throttle body doesn't have a vent tube?
I tried to do some searching and it might be part of the evap system, but I couldn't get a definitive answer.
I tried to do some searching and it might be part of the evap system, but I couldn't get a definitive answer.
#2
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Re: Throttle Body Vent Tube Question
Looks like the check valve that the HVAC and cruise need, to keep vacuum stored up for when it goes away during hard acceleration.
Not "vent". Goes to manifold vacuum. You can get that from the plenum or the TB, wherever it's most convenient.
Not sure why they have both the vac supply to the control head, and also the line that works the heater control valve, both connected there. Kinda weird.
Not "vent". Goes to manifold vacuum. You can get that from the plenum or the TB, wherever it's most convenient.
Not sure why they have both the vac supply to the control head, and also the line that works the heater control valve, both connected there. Kinda weird.
#3
Re: Throttle Body Vent Tube Question
Looks like the check valve that the HVAC and cruise need, to keep vacuum stored up for when it goes away during hard acceleration.
Not "vent". Goes to manifold vacuum. You can get that from the plenum or the TB, wherever it's most convenient.
Not sure why they have both the vac supply to the control head, and also the line that works the heater control valve, both connected there. Kinda weird.
Not "vent". Goes to manifold vacuum. You can get that from the plenum or the TB, wherever it's most convenient.
Not sure why they have both the vac supply to the control head, and also the line that works the heater control valve, both connected there. Kinda weird.
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