The compression isn't higher, the starter motor torque is lower. Bad starter or bad cables/connections can often cause this symptom.
It mostly happens when hot since the electrical resistance goes up with temperature; high temp => high resistance => low current => low starter torque=> engine barely turns over.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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