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Worked on my friend's 2002 VW Golf today in an attempt to resolve a sporadic misfire/stumble at acceleration. There doesn't appear to be any pattern to when the symptom appears.
I found a hole in what I believe is the PCV hose. It goes from the oil filler back to the air intake, post filter. There was a light amount of white foam around the oil fill opening, indicating some water had been introduced.
I cleaned the exterior of the hose with brake cleaner and wrapped electrical tape around it just to seal the leak until the replacement part comes in.
Is this leak what is likely causing the misfire? Prior to finding the leak, I sprayed the coil and plug wires with water while in a dark garage looking for sparks/misfires, and found none.
I'm having my friend replace this hose and then perform an oil change. The spark plugs foul too from this issue, so I might have him clean those up again. Any other recommendations?
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