Remember that the oil pressure on the tensioner is a back-up. The spring would have to fail for you to even need the pressure on the tensioner.
Could it be that this is simply a spring that is no longer working and the pressure is only enough to provide tension at hi RPM?
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-Dave in Minnesota
96 C4 Cab, 85.5 944
82 SC Targa SCWDP #0023
82 928
67 912 60 T-5 B Cabrio
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