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PostPosted: Sat Apr 10, 2021 12:23 pm 
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Joined: Sat Dec 07, 2019 6:18 pm
Posts: 12
I have a 77 Chevy Luv with stock Hitachi carb. How can I tell if my secondary butterfly comes open? Does it run on vacuum only? when I activate the throttle, the secondary does not move. I have tried putting a paper clip on the diaphragm, but it doesn't seem to move after I drove it down the highway. How can I check the vacuum? It goes about 65 or 70 mph top speed. Swinedog


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PostPosted: Sat Apr 10, 2021 8:20 pm 
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Addicted to LUV

Joined: Sun Jun 06, 2004 11:48 pm
Posts: 6322
Location: Whittier, (So). Cal.
drive it down the street with no air filter on. when you floor it you should hear that the secondary is open. It sounds different than just half throttle. Also with the engine off, open the throttle linkage all the way and then move the secondary linkage to make sure it's not bound up.

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