Why Engine cranks slowly?

Answer 1

If an engine is cranking slowly the first thing I would suspect is a weak battery. Remove both battery cables and clean both the cable connectors and the battery posts. Put a battery charger on the battery and charge it until if is fully charged. If the problem still persists, then suspect a starter going bad or the engine is slow in time. Remove the starter and have it tested at an auto parts store. If the starter checks OK, then you need to have the engine timing checked. If your Check Engine light is on, have the ECU scanned for a trouble code and go from there.