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Vacuum lines on a 350 TPI?

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Old 11-09-2009, 10:56 AM   #1
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Car: 1987 IROC Z
Engine: 350 TPI L98 block
Transmission: 700R4


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Vacuum lines on a 350 TPI?

I know their are vacuum lines on my 350 but, i am unsure of which remain. I no longer have any emissions, nor do I have A/C or heat, so the only ones i see are

Break booster to plenum
line from drivers side valve cover to plenum (PCV ?)
Line from passenger side valve cover to throttle body
Lines to the windshield wiper motor
Line to the washer fluid bottle

The throttle body coolant bypass has already been done so thats plugged up. Are their any others that I might be missing?
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Old 11-09-2009, 11:10 AM   #2
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Re: Vacuum lines on a 350 TPI?

There should be one going to your vacuum ball, it tees off from the one going to the washer fluid bottle.

There should for sure be 2 lines running to/from your fuel pressure regulator that sits towards the back of the base intake manifold. These are small hard plastic lines.

There may or may not be another small plastic line going from the throttle body to your egr valve that's located in the middle of the base intake manifold.

I believe there is another one of those tiny lines that runs into the wiring harness for your hvac, on my car it tees off by the map sensor but you have a maf car Im assuming. I cant picture it right now though so it may be something else Im thinking of.

All I can think of right now.
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Old 11-11-2009, 11:09 AM   #3
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Re: Vacuum lines on a 350 TPI?

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Originally Posted by 300hpse View Post
There should be one going to your vacuum ball, it tees off from the one going to the washer fluid bottle.

There should for sure be 2 lines running to/from your fuel pressure regulator that sits towards the back of the base intake manifold. These are small hard plastic lines.

There may or may not be another small plastic line going from the throttle body to your egr valve that's located in the middle of the base intake manifold.

I believe there is another one of those tiny lines that runs into the wiring harness for your hvac, on my car it tees off by the map sensor but you have a maf car Im assuming. I cant picture it right now though so it may be something else Im thinking of.

All I can think of right now.
Ok, I have those going from the AFPR to the plenum (although the second hole on the plenum is just capped, and I don't have an EGR valve.

I am unsure of this vacuum ball your referring too. Is this on the firewall somewhere ?
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Old 11-11-2009, 11:33 AM   #4
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Car: 1991 Trans Am GTA, 2003 Grand Am GT
Engine: 350 Tune Port
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Re: Vacuum lines on a 350 TPI?

Doesn't the vacuum ball line T off and go to teh cruise control module if so equipped? I cannot imagine a vacuum line being attached to the windshield washer solvent.

Attached is the diagram another member from this board completed.
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Vacuum lines on a 350 TPI?-87-89-5.0l-5.7l  
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Old 11-11-2009, 02:56 PM   #5
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Re: Vacuum lines on a 350 TPI?

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Originally Posted by wildjyoung View Post
Doesn't the vacuum ball line T off and go to teh cruise control module if so equipped? I cannot imagine a vacuum line being attached to the windshield washer solvent.

Attached is the diagram another member from this board completed.
NICE! That answers all my questions, should have this posted as a sticky. A quick answer to the question "Where are the vacuum lines on a TPi ?
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