C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

88 TPI vacuum problems

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Old Mar 24, 2009 | 12:36 PM
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Default 88 TPI vacuum problems (pics)

I have a 88 TPI. I recently disassembled the plenum, runners, intake, distributor and throttle body. Now I put them back together and I have a loose vacuum end
Maybe you guys can help me out. I put some pictures here. Maybe you notice something whats wrong with my L98 vacuum lines. When I fired it up it rumbled when idling, but I think its because timing isn't right.








Last edited by superspeeder; Mar 24, 2009 at 12:42 PM.
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Old Mar 24, 2009 | 01:01 PM
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On my 87 that connector is located at rear on driver side of motor main line in on botton coming from harness one line goes to AC vent control one line to FPR. The front line you call a loose end goes in throttle body passenger side just below water outlet. There should be a routing diagram driver’s side fan shroud. I don’t know why someone moved the connector to front of motor. Connector on rear of plenum passenger side should go to ERG rear line and front into air pump next to AC .

Last edited by floridamale; Mar 24, 2009 at 01:11 PM.
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Old Mar 24, 2009 | 01:17 PM
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Originally Posted by floridamale
On my 87 that connector is located at rear on driver side of motor main line in on botton coming from harness one line goes to AC vent control one line to FPR. The front line you call a loose end goes in throttle body passenger side just below water outlet. There should be a routing diagram driver’s side fan shroud. I don’t know why someone moved the connector to front of motor. Connector on rear of plenum passenger side should go to ERG rear line and front into air pump next to AC .
So my vacuum lines are all wrong. Damn
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Old Mar 24, 2009 | 02:30 PM
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Just check the diagram on fan cover its really straight forward not that many lines to deal with.
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Old Mar 25, 2009 | 03:26 PM
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Originally Posted by superspeeder
I have a 88 TPI. I recently disassembled the plenum, runners, intake, distributor and throttle body. Now I put them back together and I have a loose vacuum end
Maybe you guys can help me out. I put some pictures here. Maybe you notice something whats wrong with my L98 vacuum lines. When I fired it up it rumbled when idling, but I think its because timing isn't right.







That connector goes to the right rear, tees to the climate control, vacuum canister, etc.
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