mVÌPVÿÿ>  Has the starter (in particular, the starter solenoid) been
replaced?
mVÌPVÿÿ>  
mVÌPVÿÿ>  When you mentioned having to wait 30 minutes to restart it, that
would be a
mVÌPVÿÿ>  cool down time. 


I had the same issue with an old Porsche 914. After a long trip it wouldn't
start as the starter solinoid overheated. They actually came up with a
replacement that cured the problem. 

  
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