Let me tell you about starting problem with my Jack, a 1998 TD.
In May 2006, just prior to the Injector Recall (and not being aware of it) I put my truck into the local Holden dealer to have the injector external seals replaced, for about the fourth time. While they were doing this, the mechanics put that diagnostic computer on it, and it showed that there was electrical interference with both the wiring harness and the oil pressure sender on the common rail (which makes the decision on whether the truck will start or not). So they said I would have to replace them at a cost of approx. $600. However, I insisted that they just wash out the electrical cup connectors on the harness to the injectors (as I had only put the brand new harness on myself about 2 weeks previously) and put it back on again. I reluctantly agreed to the sender unit, which they reckoned was cracked and leaking. In truth it was not, again, it was oil in the connections, but by this time I had paid for another one to be put on. About 3 weeks after this, the recall came, and the top came off again! New injectors, with new internal ceramic seals (the internal Viton seals were breaking down), and a whole NEW set of external seals on the injectors and the sleeves.
Last week, the truck, after doing a lot of stopping and starting, stopped completely, and I thought it to be a problem with the fuel pump on the motor, so had it towed to the Holden dealer. First thing they did was put that diagnostic computer on it, found that nothing wrong with the pump or the fuel system, but that the oil pressure sensor sender on the rail was defective, leaking, and that the wiring harness was also defective, and immediately ordered new parts (near $700). I argued that this was unnecessary, but the Service Manager, (from Toyota) insisted, and I had to cough up another $1100 to get it back. In checking, I found (again) that there was absolutely nothing physically wrong with the wiring harness that a good wash and possibly some gasket goo on the seals could not fix, and that the O-ring washer on the oil pressure sender was squashed and defective (a $17 part), and had been put on badly back in 2006, and had been getting progressively worse ever since, leaking oil, and lessening the very necessary pressure in order to start the truck. It had finally given up the ghost, allowed enough oil to pass to render the sender unit inoperative. Also, it appears some oil was in the electrical contact cup.
A wash, a new seal, put on properly, and I could have been saved a lot of money.
In truth, if I had woken up to what it was, as I should have done, I could have saved myself the whole cost except for one O-ring seal and some high-temp gasket goo for the tappet cover and the connectors, by doing the job myself.
Dealer garages with their diagnostic machines place too much reliance on them telling the exact truth, with no shades of
grey. This thing could have cost a lot less if the garage had stripped down the top first, checked the connectors and the oil seal, done some rudimentary servicing, and put it back together.
If you are having anything like this problem, and as I say, I have had it in various manifestations ever since I got the Jack, but was often sidetracked by the problem with the Injectors, give a lot of thought to having the parts checked and washed before allowing new parts to be ordered at quite incredible cost. These dealer garages make a lot of their profits from selling the new parts.