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Thread: Check Valve and Engine Performance
Started 5 months, 2 weeks ago by showman
Saw someone post that they heard a hissing noise on there 84 and ended up replacing their brake booster check valve which they said really improved engine performance. Does that make any sense? When I disconnect mine, the idle goes way up. Thanks!
Site: 2006 C6 Corvette Action Center Forums - Corvette Action Center  2006 C6 Corvette Action Center Forums - Corvette Action Center - site profile
Forum: C4 General Discussion  C4 General Discussion - forum profile
Total authors: 3 authors
Total thread posts: 3 posts
Thread activity: no new posts during last week
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Rex S replied 5 months, 2 weeks ago
Any booster leak will cause a lean condition as they draw vac from the intake manifold. Replacing a leaky (to atmosphere) check valve would correct the lean mix.
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Schrade replied 5 months, 1 week ago
Quote: Originally Posted by showman Saw someone post that they heard a hissing noise on there 84 and ended up replacing their brake booster check valve which they said really improved engine performance. Does that make any sense? When I disconnect mine, the idle goes way up. Thanks! Makes sense only if the hissing was a vacuum leak. Idle should go up...
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Top contributing authors

Name
Posts
showman
1
user's latest post:
Check Valve and Engine Performance
Published (2009-10-01 15:07:00)
Saw someone post that they heard a hissing noise on there 84 and ended up replacing their brake booster check valve which they said really improved engine performance. Does that make any sense? When I disconnect mine, the idle goes way up. Thanks!
Rex S
1
user's latest post:
Check Valve and Engine Performance
Published (2009-10-01 17:06:00)
Any booster leak will cause a lean condition as they draw vac from the intake manifold. Replacing a leaky (to atmosphere) check valve would correct the lean mix.
Schrade
1
user's latest post:
Check Valve and Engine Performance
Published (2009-10-09 18:20:00)
Quote: Originally Posted by showman Saw someone post that they heard a hissing noise on there 84 and ended up replacing their brake booster check valve which they said really improved engine performance. Does that make any sense? When I disconnect mine, the idle goes way up. Thanks! Makes sense only if the hissing was a vacuum leak. Idle should go up when the vacuum line is disconnected. Then it should go down, and up, and down, like a Duncan...

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