7.3 Intermittent No Start

Pwnm30rdi3

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Hey everyone!

This winter I've been battling an intermittent no start. It seems to occur about 5% of the time after I turn the truck off.
It's so rare that every time I have my laptop with me, it doesn't happen. I haven't been able to log any data regarding the no start.

Today it left me stranded for about 15 minutes. I parked the truck, got some food with the girlfriend and when I came back out.. The truck refused to start!

I cranked for 30 seconds on, 60 seconds rest. After about 15 minutes of trying to start the truck, the batteries were getting weak. I decided to try it one last time before calling for a tow. Sure enough, on the second revolution, she fired right up.

CPS has been switched out and doesn't seem to have any effect. RPM gauge moves while cranking. On any normal day it fires up very fast, usually the second or third revolution.

Oil level is perfect, no drain back in the HPOP reservoir.

All connections are tight to my knowledge. Both UVCH's are brand new. Any thoughts?
 

Pwnm30rdi3

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How's the harness goin to the IPR look

I replaced the whole IPR pigtail about 2 years ago, ever since then it has looked great!

Check the relays. IDM and PCM. Doubt it's the PCM relay, if so, you would not get a wait to start light.

Any tips to checking the relays? Ohm test?
If it's only intermittent, would I even be able to test for a bad relay?
 

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