Extended Crank issue

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PapaWolf

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Otterville, ON
Ram Year
2016
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Hemi 5.7
This has probably been asked a tonne but, I have a 2016 5.7 Hemi that has had an issue with extended cranks periodically happening since the 3rd month I've owned it. It started after they updated the software during a routine oil change. It never happens at the dealership even though they had it all day before. There is no specific time it happens, just randomly won't start. Turn off turn on and it fires right up.

Fuel pump? relay? Cam sensor?
 

lpennock

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Phoenix, AZ
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2018
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5.9L & 6.7L Cummins
Sticking check valve allowing fuel rail to bleed down. Pretty common on older vehicles but possible on a newer. Turn key on and wait a couple seconds before cranking to allow fuel pump to build pressure.

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JohnnyMac

There are no stupid questions, just stupid people.
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What @lpennock said is exactly what happened to my 2000. The fuel rail would bleed pressure after it sit for a few hours and I had to turn the key on and give the fuel pump a few seconds to charge the system before I cranked it or it cranked for a while before it fired. 2016 might be a little new for that, but still certainly possible.
 

tommy_harrell

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This has probably been asked a tonne but, I have a 2016 5.7 Hemi that has had an issue with extended cranks periodically happening since the 3rd month I've owned it. It started after they updated the software during a routine oil change. It never happens at the dealership even though they had it all day before. There is no specific time it happens, just randomly won't start. Turn off turn on and it fires right up.

Fuel pump? relay? Cam sensor?


My '14 6.4 when new would crank, and time out and would usually start on the second attempt. I saw a recommendation to unplug the harness above the accelerator pedal and reconnect it.

It fixed the issue for me for over 5 years.
 
OP
OP
P

PapaWolf

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Otterville, ON
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2016
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Hemi 5.7
Ok the dealer has tried for 4 yes and found no fix. Grrr I'll try this.
 

RamCares

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