Seek to understand,^Value
Actually that thread is for diagnosing misfires ... many of which do happen to be vacuum leaks.Well there is a thread for chasing vacuum leaks
That thread was written simply by reading scores of misfire threads, and putting into that one canonical thread all the potential culprits. Now we need to expand it to include better diagnostics for 'each' culprit.
It's not anywhere as good as it should be (I should know! ). So far, it mostly just 'identifies' problem areas; but the 'diagnostic' part for each problem area is greatly lacking (and needs to be improved).
For instance, here is a specific diagnostic for suction out of the oil filler cap that I just ran today while I was spraying Kalifornia carb cleaner all over my engine to detect vacuum leaks:
That post is fantastic, but it's for the CCV specifically. I have no indication that my CCV, in and of itself, is malfunctioning (yet).See post #1
I took another look (and pictures in daylight) of the 'mouse-eaten' CCV insulation.If the CCV drain hose has a hole, the CCV will open wide in a vain attempt to pull a small vacuum on the crankcase
I ran the engine and sprayed carb cleaner and then Brakleen (which dried up much quicker so I assume it's vastly more volatile ... which is what you want).
I looked & listened (for rpm changes) closely. I do not think the integrity of the plastic CCV drainage pipe is breached.
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