ManBearPig
Well-Known Member
Will the purge valve operate in a way that makes the throttle body open/close slightly in a rhythmic pattern every few seconds? I have taken a datalog of this and can see the throttle body opening about 1* every 2 seconds for about 15 seconds. During this time the vacuum gauge will bounce slightly and the spark Will bounce several degrees (presumably to keep idle speed steady). The exhaust note audibly changes, and now I have discovered that with the hood open I can hear something clicking when this occurs. Does that still sound like the purge valve operation?That would be the purge valve.
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