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Deceleration valve CIS
How does a CIS deceleration valve work? 79 930
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AMG V8 SL55 Mercedes, 993 C2, 86' Carrera 3.6 hot rod, Purple 1998 993 that didn't make the cut, 3 very old 930s, A/Fuel Dragster CH3NO2 (R.I.P.), Blown Alcohol TAD, AA/AA, 360 Maxim wingless, Cummins Turbo Diesel. Amateur Welder, Painter and sculptor sort of. - |
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03-11-2007, 02:26 PM
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Join Date: Dec 1999
Location: Richmond, VA USA
Posts: 1,058
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The deceleraton valve is a throttle plate bypass device that is controlled by intake vacuum. At idle or under power (throttle plate open), the valve is closed. It opens when you close the throttle and create high intake vacuum during engine braking. The extra air produces better combustion and lowere emissions.
Brian |
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03-11-2007, 03:32 PM
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1996 Other A/Fuel Dragster 525 JP1
2011 
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2011 
1986 911
AMG
