Car won't start, no codes and cranks

[JayTea]

2015 Mustang gt won't start... Battery good, alternator replaced, starter cranks, fuel pump primes, relays / fuses good, MAF sensor tested, no codes with SCT

Anything else I should try looking at? It started the day before.

Recently had to replace the intake manifold because the imrc failed. Replaced with a 2018 manifold and tune. Was running for 2 months with no issues.

Thanks

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[G.T.]

Fuel, air, spark...which is missing?

Sounds like spark from your description?

 

[dburgjohn]

since you mentioned repair work my guess is some wiring connector got reconnected enough to run then but not secure enough to stay connected after a little driving. Fuel + AIr + Spark at right time and right amount = car runs. Agree with G.T. you are missing spark.

 

[JayTea]

Thanks for the input! I just found fuse #44 - vehicle power #4 to have gone off. Replaced it and it went off again. At least now I have something to chase and investigate

 

[Cobra Jet]

Thanks for the input! I just found fuse #44 - vehicle power #4 to have gone off. Replaced it and it went off again. At least now I have something to chase and investigate

Find the short…

Look for any wires touching chassis creating a short or start opening looms near where the repair work took place to find the broken wires inside the loom.

 

[JayTea]

found the culprit when testing the connectors...

It's on the PCM / coil harness. Just need to get access behind the motor now to figure out where it goes to and what connector so I can order pins for repinning.

I guess my other option is to buy a new wire harness.

 

[G.T.]

Nice work finding that. Hope that's it and fixes it.

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