If you can get an inductive amps clamp it will need to cover up to 800 /1000 amps and use a volt meter on the battery , give it a test when it's non starting and lets see what amps it's pulling out and see what the battery drops down to .
Also if it does take a load of current to turn the starter that high resistance in leads or earth points , earth straps from engine to body can cause slow cranking and high amps draw
I still think it's odd that it cannot make over 80 bar of rail pressure when it's non starting but normally sticking imv or drv show some kinds of issues when running or idling aswell ....hunting up and down and rail pressure uneven and jumping around and so on .
The start protocols from cold to warm are roughly the same , a little more fuel pressure and fast idle dialled in for cold start , injection begin time will be slightly different but not enough to cause non start conditions .
What can be quite different from cold to warm is the ability of the pump to make pressure , cold diesel is less viscous so it's easier to make higher pressures , same as engine oil ....there's lots more oil pressure when cold to when oils up to temp , so if the high pressure pump was down a little on efficiency and an injector or if the injectors where spilling a little to much this scenario supports why it can start from cold easier than warm , all theory's but sound feasible.
See if you can get that amps clamp and see what the starters pulling out , keep at it .
Lee
|