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originally posted by: the2ofusr1
a reply to: TinySickTears
Try using a water hose to isolate the place .
originally posted by: verschickter
ah, probably needed some pressure to seal when cold.
my second guess would have been the "AGRV" in english it would sound something like "exhaust-backfeed-valve". It feeds back exhaust gases into the intake manifold for reburn but was not sure your PT has one. Those can make funny noises at times, and it engages around that RPM. They collect schmoo over time.
Mine sounds like a pov on full load, that´s why I asked what happens under load change.
But since you found it...