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Ok, I will be on the look out for smoke. What could cause an injection pump to work all the time except for when the engine is semi-warm?

Yes. I have both driven it to operating temp (via dash gauge) and let it idle to operating temp. Wait light quickly flashes if shutting it off after a warm up when restarting. This should be normal. The engine starts well if under, say, 30 mins [i.e. still hot]. That 1-3 hour mark, depending on...

The wait light quickly flashes off, but (depending on the ambient air temp) it will start because it is actually warm. Today the air was in the 50s F and 75 mins was long enough for it to cool and not want to start, but not long enough to cool so much that the wait light fires the glow plugs...

Try the other temp sensor? Smart box sucks? Again, it works perfect if engine is cold. If less than maybe 30 mins, engine is still hot enough to not matter. I tried today at about the 75 min mark and it did not want to start.

I installed a new Nartron TSU from Mac. Still occurs. What now?

I was referring to static electrical buildup from the turbocharger effecting coolant. Same engine, yea.

Some crap about HOAT coolant and they are selling OAT. I always thought any green was for cast and other stuff (like orange GM Dexcool) for aluminum. Not sure how well green Prestone holds up with turbocharger static over time?

Probably just fine for naturally aspirated, but I am worried with a turbo, plus mine is a tad low already.

Just find one for Nartron, correct? I heard these have to match the start box. This is something I must get from hummerpartsguy or Mac Motors correct? MME, Federal, and Eastern Surplus have some cheaper; but some even look unlabled/unbranded. Not sure if those are for the EESS boxes or just...

Do you know which one the dash gauge reads from?

I got the 6.5 L turbo

After replacing the glow plugs (4 were bad) the engine starts amazingly easy when cold. The "wait" light stays on about 10 seconds when cold, everytime. If the engine is not fully cooled down (say I drove it an hour prior) the wait light stays on about 1/4 of a second (i.e. a quick flash) and...