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Old 12-02-2020, 12:38 PM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 44,710
 

2003 L-Series 3.0L Sedan
Default Re: New engine/ no crank just clicks

Remove spark plugs and manually hand turn the engine at the crankshaft. There's a small chance you have a seized engine that won't turn over. With plugs removed, zero compression with hand turning or starter. By hand turning, you'll either feel the engine locked with a mechanical feel or nothing as the engine turns over easily. Normal engines always turn over.

When spark plugs are removed and the starter is used, the engine spins faster since a zero compression engine isn't placing a load on the starter. With plugs in place, hand turning is difficult as each piston compression resists efforts of manually turning the engine. It can be done but more force is needed to overcome compression. Removing plugs simply makes troubleshooting easier with less effort.
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