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

85í vacuum hoses

 
Old 04-15-2019, 09:42 PM
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Mason123
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Default 85í vacuum hoses

My 85 in idle will show RPMís all over the place. Itís not steady. Sometimes the car will stall and die.

my vacuum hoses are messed up. Can that cause the issue and how can I go about fixing it?

also, whatís that circle looking thing above the battery. Drum looking thing?
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Old 04-15-2019, 11:00 PM
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VikingTrad3r
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its the cruise control controller.
there was a guy here a few weeks ago eith vac lines from an 85 in a thread. did u search forum? should be able to find his posts. your vacuum system MUST be up to spec especially on the 85. it doesnt handle compensation as well as 86 and later.

repair vac lines
do minimum idle procedure
report back
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Old 04-16-2019, 02:42 PM
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Mason123
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Originally Posted by VikingTrad3r View Post
its the cruise control controller.
there was a guy here a few weeks ago eith vac lines from an 85 in a thread. did u search forum? should be able to find his posts. your vacuum system MUST be up to spec especially on the 85. it doesnt handle compensation as well as 86 and later.

repair vac lines
do minimum idle procedure
report back
i tried to find out how to fix the vacuum lines but I donít know how. Any tips ?
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Old 04-16-2019, 03:10 PM
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confab
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https://www.corvetteforum.com/forums...post1585483576

Measure them, or just cut pieces as samples, and go to the part store and get some new lines of the same size and replace them.



Last edited by confab; 04-16-2019 at 03:14 PM.
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Old 04-17-2019, 12:47 PM
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85vegasvette
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I had the same issue when changing my injectors the plastic shattered, and the diagrams help alot, i have an 85 also , now i never had the check valve off of the plenum in the back, i ran it to the vacum tank, my idle is almost solid, and i have cruise,as and heat so sometimes it just works without knowing why
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Old 04-17-2019, 10:27 PM
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Mason123
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Originally Posted by 85vegasvette View Post
I had the same issue when changing my injectors the plastic shattered, and the diagrams help alot, i have an 85 also , now i never had the check valve off of the plenum in the back, i ran it to the vacum tank, my idle is almost solid, and i have cruise,as and heat so sometimes it just works without knowing why
think you can give me a bit of assistance? I donít understand the diagram much and Iím confused exactly where these vacuum hoses go and stuff. Thanks!
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