Weird warm up after egr ****** & oil cooler

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I've noticed after I did ****** and oil cooler after truck sits over night it has to warm up or it has no power, almost like its lost prime. After 30-45 seconds of warm up it runs fine but before that it won't even pull itself. Any idea where to start?
 
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I did the egr ****** and oil cooler, I drained the valley the oil cooler sits in and drained all of the truck oil and did an oil change. Truck has been driven roughly 1,000 miles since then though I would imagine all of the air is purged.
 

ghohouston

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Gotcha. I wasn't sure if you had put any miles on it after the oil cooler to work the air out. You need to get it on a scanner. Check ficm voltage, check for injector codes/do a power balance test, and check your ect/eot sensors, before you start the truck in the morning, and see of the sensors are reading close to the outside temp.
 

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