Throttle body vacuum line

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Sep 4, 2018 | 01:14 PM

micktroup

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Joined: May 2005

Posts: 239

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From: California

Car: 1991 Z28 Camaro

Engine: 5.7L V8

Transmission: auto

Throttle body vacuum line

hi everyone. I have a 1991 Z28 with the 5.7L- box stock. Well, except for a cat back and some other incidental stuff...

i had had an engine fire that I managed to get out quickly, but I have to repair some stuff. The fire was at the schrieder valve on the fuel rail, so I’ve got some vacuum line damage, among other things.

if you have a similar set up, can you tell me where the vacuum line from the throttle body goes. Mine just ends under the plenum. I’ve looked at all sorts of diagrams on line, but none are clear enough to explain my particular set up.

thanks very much.

Sep 4, 2018 | 01:23 PM

Drew

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From: Salina, KS

Re: Throttle body vacuum line

EGR solenoid

Sep 4, 2018 | 01:35 PM

micktroup

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Member

Joined: May 2005

Posts: 239

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From: California

Car: 1991 Z28 Camaro

Engine: 5.7L V8

Transmission: auto

Re: Throttle body vacuum line

Thanks for the quick reply! Do you have a photo of the solenoid or a diagram that I can reference? Or perhaps someone has the plenum off theirs and can snap a photo?

Sep 4, 2018 | 02:07 PM

Drew

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Re: Throttle body vacuum line

The solenoid is back by the ignition coil. You've got one hard line from the TB providing vacuum to the solenoid, and a second hardline going back to the EGR valve. The valve just opens/closes to connect/disconnect the two, so it shouldn't even matter which side is connected to which.