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

throttle body question

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Old May 5, 2016 | 07:45 PM
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dgantt
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From: hanceville al
Default throttle body question

Hey Guys,
Quick easy question. On a 1990 speed density TB there are 2 hoses off the passengers side on the TB. Not the radiator ports, the top and middle ports. One goes to the CCV. The other I don't know. If some one could give me this info I would be appreciative. Where do they go? Thanks
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Old May 5, 2016 | 08:04 PM
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From: Phila., PA burbs
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The top port goes to the valve cover and the middle goes to the EVAP purge solenoid. Not the best picture, but it should give you the idea.


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Old May 5, 2016 | 09:02 PM
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From: hanceville al
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Hey TA thanks, where is that solenoid located and is it necessary that it be connected or can you cap off that port on the TB. Funny your engine loos very similar to mine, I almost have the same valve covers and all my TPI is black as well.
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Old May 6, 2016 | 10:50 PM
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From: Phila., PA burbs
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Originally Posted by dgantt
Hey TA thanks, where is that solenoid located and is it necessary that it be connected or can you cap off that port on the TB. Funny your engine loos very similar to mine, I almost have the same valve covers and all my TPI is black as well.
Its the solenoid in between the runners in the pictures, with the red clip.
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