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6.0L Hard Start - cold and warm, runs fine
Thread title says it all, but this beast has 96k mi, has had troubles for 16k miles. It starts after cranking for a while - not immediately, but slowly until it reaches idle speed. Once started, cold or hot, it runs like a scolded cat with no loss of power, smoke, or any other problem.
Today replaced the GPCM harness via Navistar wiring kit. Made no difference. Other items replaced recently - new batteries (last week), crankshaft position and camshaft position sensors two weeks ago. The sensors made a big difference in power and driveability.
In the last year have also replaced HPOP, and proactively the EGR valve and cooler (went with aftermarket), oil cooler, turbocharger wastegate actuator, FICM, GPCM controller. All of these things help with driveability and power. Hard start cropped up as a cold start issue but now is an issue cold or hot.
Any suggestions for what to check next?