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Join Date: Mar 2000
Location: kaneohe, hawaii, USA
Posts: 33
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Question '74 1.8l Decelleration valve

I have been driving for years without this valve and cannot see the effects on the engine performance. Now that I've done a major overhaul I am considering adding the missing part but am having a tough time locating pt#022 133 551 B. This is a great forum so I am sure some one out there will have experience and/or thoughts on this subject. Thanks in advance, Al

Old 04-30-2002, 01:39 PM
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Join Date: Apr 1999
Location: vienna,VA,usa
Posts: 148
my thought is that the decel valve just adds some air into the system on "overrun" to reduce emissions. also, does your state have emissions inspection? if yes, maybe the inspector would not notice it's missing. well, if it were me, it would be about #20 on the "to do" list. yes, it should be there, the factory designed it. yes, it would be good for the environment. no, i'd have to hunt one down and associated hoses and it probably wouldn't hurt/help performance. if i tripped over it, i'd pick it up but have other problems to take care of first.
Old 05-01-2002, 08:51 AM
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Join Date: Feb 2001
Location: Laval, Quebec, Canada
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What a coincidence, I reinstalled it last week in my 1.8. It was still on the engine but was missing one of the hoses.
I didn t see a big difference except when you shift; the engine doesn,t go back to idle as fast, wich seem to make it easier to shift.
I will leave it there, it will be my 2 cents for the environment.

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1973 914 2.0 mostly track car
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1996 Volvo 850 station ( Good family-men car )
Old 05-01-2002, 06:55 PM
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