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Discussion Starter · #1 ·
Hoping someone can point me in a direction to get me started. New distributor installed. Replaced amp module. Smooth idle but it takes 3 cranks to get her going. ‘94 with a 3.9. Any ideas? Thanks!
 

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Discussion Starter · #3 ·
Confirmed low or no spark at high temp. Starts right up when cold. So am I down to it being either another IAM or the fuel temp sensor?

what would keep cooking the IAM if that’s it?
 

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Discussion Starter · #7 ·
Thanks for the help. I’ll message powerspark.

Does everyone agree with narrowing this down to the IAM again? Is it possible to keep cooking these like this? Seems like they should last a few trips and not throw an immediate fit. What would cook these so quickly?

I’m also suspecting the fuel temp sensor here. I haven’t tested it yet though.

I really want to (pretend to) trust this truck. What else should I be checking to cure this?
 

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Discussion Starter · #12 ·
Fair enough. I’ll go through all the ignition checks again.

It never fails to start. It starts immediately and purrs when cold. It takes 3 or 4 cranks when the engine is warm.
 

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Discussion Starter · #13 ·
Been checking and diagnosing. Finally got a code 15 - fuel thermistor. Is that the fuel temp sensor? Is that what’s located in the fuel rail on the front passenger side? Thanks!
 

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Discussion Starter · #24 ·
For future reference - it was the fuel temp sensor. Sounds sweet and fires up at all temps now. Idling a little high but that’s the next problem.
 

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Discussion Starter · #25 ·
I was wrong - she tricked me. So, hard start when engine is hot is back. New symptom - when using AC and keeping the interior cool, it fires right up. Once the cabin gets warm again, hard start. Coincidence? Thoughts?
 
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