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Author
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Topic: what are the symptoms of a bad bypass valve?
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166 Merlo
FELONY
MOTORSPORTS
Member # 1549
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posted
 
 
on a supercharger ![[Confused]](confused.gif)
for example how would a car act?
[ June 01, 2005, 11:47 PM: Message edited by: Mr JoCo ]
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'89 - Boss Coupe
'70 - Drop Cutthang
'68 - Cougnut
'87 - 0166, Its real
Posts: 3954 | From: Thebay | Registered: Jul 2002
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mtbaughs
Road Racer
Member # 4052
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posted
you need to test it with a vacuum pump. Make sure the vacuum source to it comes directly off of a manifold source....
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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John91coupe
CAFords OG
Member # 18
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posted
If it is stuck open you will have very reduced boost pressure. If it is stuck closed you will have bad driveability in cruise and low throttle positions. As mentioned, best to take it off and check operation with a hand vacuum pump and also make sure your vacuum hookup location is working.
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D-2R ProCharged R302 331
1.410 60 ft.
5.784 @ 122.92 1/8
8.953 @ 155.08
MM&FF Feature June 2003
Posts: 1361 | From: Grass Valley, CA | Registered: Sep 2000
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S351-R
CAFords OG
Member # 1605
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posted
When the by-pass valve stuck closed on my S351, it actually blew out the front oil seal on the supercharger after letting off on the throttle while under boost.
Posts: 344 | From: Earth | Registered: Jul 2002
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