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#1074509 07/20/22 11:42 PM
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Hey guys - are there any good photos of what vacuum lines do what, and essentially, which ones can be plugged up and emission parts removed? I have the 83 305 with all the bells and whistles as far as pollution control and looking to start removing everything that’s not essential.

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Here is some vacuum diagrams, https://gbodyforum.com/threads/engine-vacuum-diagram.73266/

Usually there is a diagram on the fan shroud, if not you can usually find a remake decal on the web and get info from there. Most vacuum diagrams are on the internet through searching, you just need year, engine, and engine code. Before undoing lines or removing do plenty of research and make an educated decision on what you want to remove. I'm not sure on your local areas rules and regulations and what checks you have.

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This should be your exact emissions routing for your 83 305 monte carlo.

https://www.opgi.com/decals/engine-...4bbl-auto-high-low-altitude-l220268.html

[Linked Image]

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Its best not to remove anything unless you are building a race track car.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
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Thanks Brent exactly what I was looking for - what’s the role of the vac motor on the air cleaner?

Agreed Buick.

Last edited by 83Monte305; 07/24/22 11:48 AM.
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Part of the thermac system, in this thread it will tell you how it operates. https://gbodyforum.com/threads/removing-thermac-system.58973/ The listed thread is about removal but it's the first one I came across to explain.

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So I followed the diagram and seemed to connect everything successfully except when I hooked up ‘T’ it started running pretty bad and a unusual smell coming from
Exhaust. When I pulled that line, gas dropped out - what is that port for? There was a bolt in that line originally, so someone blocked it off for a reason. When I pulled it off, engine seems to run better.

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T is the float bowl vent. Seems to be you have a high fuel level issue. This can be caused by incorrect floats, incorrect float height adjustment, sinking floats, leaking needle valve, fuel leaking around the needle seat threads, too high fuel pressure forcing needle off its seat, stripped needle seat threads, incorrect placement of fuel needle retention clip, etc.

The idea with the EVAP systems is that the fuel tank, float bowl, and crankcase vents into the EVAP system to be ingested by the engine while running instead of just venting to open atmosphere.

Last edited by Buick Runner; 07/24/22 05:24 PM.

SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
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Ok good stuff Buick. I think I’m chasing my tail with doing everything but replacing the carb, so that’ll be my next move. I guess the way to look at it is I got my old Monte running after 10+ years of sitting and replaced all the common parts that go bad so that’s done ✅

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Don't replace the carb, have it rebuilt. Its not really that hard to work on the carb yourself. Only tricky part is making your own adjustment gauges.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
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Buick do you rebuild carbs? I’d like to have someone know what they’re doing rebuild this one preferably

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Sorry but I am not a professional carb rebuilder. Before pulling your carb off you might want to check your fuel pressure in case your fuel pump is putting out too much PSI.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.

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