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We finally figured this thing out about a month ago. Just letting you all know what we found. It ended up being the Protective Control Box, we had replaced it because the old one wasn't letting the alternator charge. We had originally replaced the factory box that was bad with a new aftermarket...

We've triple checked all the connections - I have a grounding harness for it that just came in and we're going to do the cylinder balance test later and try cranking with the injection pump unhooked to see if that changes anything with the cranking. I'll update you all after we do it. Thanks for...

Unfortunately this problem occurs with the factory switch and the aftermarket key switch. Key switch has only been in it for a couple of days.

Here is a longer video, https://streamable.com/pnqp63 Started better this time but its only been sitting for about 30 minutes - the longer it sits the worse it sounds on initial start-up.

The engine runs fine once its started - no running issues at all, drives down the road fine. It also starts every time. It only sounds bad on the first crank when its been sitting for at least a few minutes.

I have a M998 with the 6.5 non-turbo. On the first crank after its been sitting for at least a few minutes it struggles to start almost like the starter is having a hard time turning the engine over. The starter is new, the batteries are new, the brainbox is new, the glowplugs are new. The wait...