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  #1  
Old 01-11-2014, 12:48 PM
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Slow Crank, No Start

Hey guys looking for some help on a 06 6.0 that I'm working on. The issue is that it will hardly crank. Guy says that the truck just shut off and wouldn't start back up. When I say slow crank I mean extremely slow to the point where it barely moves the engine, and obviously not starting at those speeds.

What I have done so far, replaced batteries with 2 brand new batteries, replaced the starter twice to ensure I didn't get a bad one, pulled off the belt and checked all pulleys all seemed OK, A/C compressor isn't locked up, tried cranking it without the belt and there was almost no difference in cranking speed - still extremely slow, tried changing the whole FICM, unplugging the crank position sensor and plugging it in, and that's about it no difference. The only thing I can think of is wiring to the starter or maybe the motors gone.. I am stumped.

Looking for some opinions of ideas of what it could possibly be or some help to get this thing spinning over at least.
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Old 01-11-2014, 01:00 PM
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Could be a lot of things. The next thing I would do is pull the glow plugs and crank it to see if there's any water in the cylinders


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Old 01-11-2014, 01:51 PM
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Try turning the motor by hand with a ratchet see if engine components are in a bind
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Old 01-11-2014, 01:57 PM
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Tried cranking it over by hand. Moves almost too easy. Way easier than my 6.0 does when I crank it over by hand. I almost would say it doesn't have much compression but that would make me believe that it would just spin right over? Correct me if I'm wrong


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Old 01-11-2014, 03:23 PM
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Well that eliminates bottom end drag problems. What kind of volt/amp draw down are you getting on the batteries? Compression, hydrolock problems next thing to check.
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Old 01-11-2014, 03:32 PM
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Any smoke? Have you checked coolant pressure? when my hgs went out it would hydrolock the motor but I could open the degas cap and relieve pressure. Idk?


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Old 01-11-2014, 04:26 PM
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Originally Posted by Bluedemon6.0 View Post
Any smoke? Have you checked coolant pressure? when my hgs went out it would hydrolock the motor but I could open the degas cap and relieve pressure. Idk?


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Thing doesn't even crank at high enough RPMs for it to smoke it cranks at like 2 RPMs.


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Old 01-11-2014, 04:28 PM
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Originally Posted by dannyboy950 View Post
Well that eliminates bottom end drag problems. What kind of volt/amp draw down are you getting on the batteries? Compression, hydrolock problems next thing to check.
Did a voltage drop test on the batteries and starter and everything seemed normal. I am thinking it is a compression issue, it just seems way too easy to crank turn by hand


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Old 01-14-2014, 06:16 AM
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When I first read your post I was thinking poor maintenace led to spun bearings but when you post that it turns over by hand "too easy", that has me totally stumped. I can't imagine that it's a hydrolock issue because that should make it impossible to turn. I would pull the glow plugs just to see how it cranks with no compression at all.
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Old 01-14-2014, 07:44 AM
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I've hear bad a/c compressors causing slow crank, also heard stand pipes causing not start.
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