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1991 5.7L TPI - Vacuum lines by distributor

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Old 09-13-2018, 11:51 AM
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Car: 1991 Pontiac Firebird Trans Am
Engine: 5.7L TPI
Transmission: 4 speed 4L60/700R4
1991 5.7L TPI - Vacuum lines by distributor

Can someone please tell me what the vacuums line by the distributor in a 1991 5.7 (350) go to? There are several....some are a somewhat narrow type made of plastic that connect to rubber hoses and 90 transitions. When I was tightening my distributor clamp, I noticed them because they were in the way. There also seems to be some sort of mount for two of the lines to the right (passenger side) of the distributor. I couldn't figure out how to disengage the mount.
Old 09-13-2018, 11:57 AM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
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Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1991 5.7L TPI - Vacuum lines by distributor

The egr vacuum lines and hvac are next to the distributor.
the hvac comes out of the efi loom. The egr comes from under the Throttlebody to the solenoid then onto the egr.
Old 09-13-2018, 12:00 PM
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Re: 1991 5.7L TPI - Vacuum lines by distributor

Old 09-13-2018, 12:16 PM
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Car: 1991 Pontiac Firebird Trans Am
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Re: 1991 5.7L TPI - Vacuum lines by distributor

Great....thanks!! Does anyone know how to release the mount holding the 2 lines by the distributor? I thought it would simply slide off, but it seems locked in somehow. I'd post a picture, but I don't have access to the car at the moment.
Old 09-13-2018, 12:24 PM
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Car: 1991 Pontiac Firebird Trans Am
Engine: 5.7L TPI
Transmission: 4 speed 4L60/700R4
Re: 1991 5.7L TPI - Vacuum lines by distributor

Check that......I just found a picture online of the same vacuum connector I'm talking about, but minus the attachment feature that is securing it down by the distributor.

Old 09-13-2018, 01:36 PM
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Re: 1991 5.7L TPI - Vacuum lines by distributor

The EGR solenoid bracket is sandwiched between the coil and it's mounting bracket on the intake. Remove the coil and it comes right off.
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