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hard start while hot


GlennWest
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On my last trip we stopped at a rest stop to stretch our legs and bathroom break. Went to fire up the ole freightshaker and it turned slowly but hard. Like plenty of juice but too much load. Tried again same. Waited a short time and then spun good. Done same a few years ago and I assumed weak batteries. Changed them. All had been good. All my batteries connections are good. Went over that while in Huntsville. 

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Slow crank can be from

- reduced juice to the starter

- bad starter

- increased load on the starter

 

Typically it is batteries or connections.  I have had starters behave in this manner when they get hot (crank slow when hot but fine when cold).  Just got rid of a supercharged jeep that was horrible for this, it ate starters like tic tac's; but with all the exhaust work done to it their wasn't a great fix available.

Vegas, a hard crank will not be impacted by fuel delivery.  Rather a fuel delivery issue could cause an extended crank. (Assuming fuel delivery didn't flood the cylinders with fuel)

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1 hour ago, steiny93 said:

Slow crank can be from

- reduced juice to the starter

- bad starter

- increased load on the starter

 

Typically it is batteries or connections.  I have had starters behave in this manner when they get hot (crank slow when hot but fine when cold).  Just got rid of a supercharged jeep that was horrible for this, it ate starters like tic tac's; but with all the exhaust work done to it their wasn't a great fix available.

Vegas, a hard crank will not be impacted by fuel delivery.  Rather a fuel delivery issue could cause an extended crank. (Assuming fuel delivery didn't flood the cylinders with fuel)

Thanks!

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Glenn if you have or can get your hands on a clamp meter check the amps on the battery cable as close as possible to the starter while someone turns the key. Lots of amps but poor cranking rpm starter is suspect. Low amps suspect cable or connection (ground).

When you say your under hood was at operating temperature means the starter was warm too makes me suspect the starter. Heat reduces magnetic wave efficiencies...

Ive been wrong 1000 times before 😃

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2 hours ago, Ray,IN said:

First is your starter 12 or 24VDC?

I would not spend money to purchase ($100)an inductive amp meter for the starter, I'd just rent one for a day. I mean it's not like you'll use it every month, then it turns into something else that overfills your toolbox.

12v. 

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