Hard hot start causes

[ak diesel driver]

So I had to change out the OS on my IP this morning. Don't think it was related to the hot start but......

 

[Quadstar Tuning LLC]

So I was talking to Quadstar yesterday about a tune and he said the u1000 code is what you get when you disable Passlock in the PCM. He also said the security light should not light. So between the security light on mine being active and a boost code that would instantly reset he figured the PCM really did have issues. I'm going to get a tune from him , I never was impressed with the Heath tune. Didn't seem to do anything more than the stock tune. But I understand that the later oem tunes were a hotter tune.

Yet another reason why the factory service manuals are wrong for these. You mentioned two in this thread which are the timing procedure and the full list of trouble codes. Then there's the countless incorrect wiring diagrams

 

[Quadstar Tuning LLC]

Cranking RPM fuel output is one of the test points on the pump bench. Nobody likes to do it since you have to get the test fluid hot and run the pump for a long time. Hogs up time on the stand and is hard to get as hot as they do in real life when heat soaked on engine shutdown.

 

[ak diesel driver]

Been told by a pump shop it's impossible to get them up to engine operating temp never mind the heat soak after shut down

 

[Quadstar Tuning LLC]

Been told by a pump shop it's impossible to get them up to engine operating temp never mind the heat soak after shut down

Yep, it's hard to replicate the real world on the test bench. However, you can get the test fluid thin enough to start seeing if the head and rotor is loose enough to drop fuel rate at cranking RPM.

 

[ak diesel driver]

I'm getting more and more convinced that my problem is our extra thin winter fuel

 

[Will L.]

If you can swap from winter fuel to summer and that solves it...
It’s possible an ip is worn juuussst to that magic limit. Otherwise gonna say- YUP.

Dig you up some #2and see.

 

[Pruittx2]

how much per 43 gallon tank, are you willing to add, either Straight Non Detergent 30sae,, or low ash 2 stroke oil to lube it up a bit?

 

[ak diesel driver]

So I forgot to post here but I changed out my ignition switch a few weeks ago and haven't had a hot start issue yet even with my winter front on