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Intermittent starting problem

mdallaire

Senior Member
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1992 XJS V12-
Intermittent starting problem, goes days with no problem then no start, can be cold or hot. Engine turning over so starter is eliminated. My thoughts are (1) fuel injector main relay, (2) coolant temperature sensor, (3) air temperature switch or (4) Crankshaft sensor (least suspect due to it is new with 5000 miles of use). Any further thoughts??
 
Mdallaire:
Check for power at coils, if ok, may be the the checkvalve on the fuel pump. These go out and let the system bleed down for a no start condition until the pressure is up.
Larry
 
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