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I have never seen a frequency valve and I have no buzzing. I do know that some systems have the valve but do all the CIS systems have that valve? That could be part of my problem. But keep in mind that it runs well and is now idling without dying. Where would the frequency valve be located? And what exactly am I look for? Thanks..Max
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Max..1989 244 DL 5 Spd., V15 Phase II Cam Bilstein HD, Turbo Swaybars, Poly Bushings all round, Turbo Wheels, Black leather interior, Electric mirrors, LED dash and gauge lights and now NEW ECODES with the turn signals, 1992 black 244 next project
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