Hard start after night TD5

CharlesY said:

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Quite obviously air is getting in somewhere as the car sits, like parked.

It is still a mystery.

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I quote somebody who really knows what he's talking about named Ricky from other forum to save u from my english but that's what i'd do(and did when i had similar problems and found a leakink pipe) >

Assuming that the battery is good, no fault codes and a good injector harness, i would attach a fuel pressure gauge and check for 4 bar at the FPR.
....then i would leave the gauge in place, clamp the return pipe, ignition on and let the pressure build, then clamp the feed pipe, ignition off.
What you now have is a pressurised fuel rail, if the gauge drops it could be indicative of leaking injector seals.
Bear in mind if it drops it could also be leaking anywhere else between the two clamps so a bit of investigation of pipework and FPR will be needed.

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More than this...if the gauge doesnt drop u can check the whole fueling system doing the "clamping" trick to the feed and return pipes at the pump.

It's the only way to make sure that the difficult starting is an air intrusion or a management issue.

An other easy test which u better do before everything is to check the inputs of the CKP sensor to the ECM . take out the ECM as to have access to the red plug with a multimeter. U can insert from behind the multimeter's pins in the red plug as to make contact: (+) to pin 13 and (-) to pin 36. then u have to follow voltage..it MUST be 2 to 3 volts with engine cranking then rising to 6 - 6.5 volts from 1000 rev/min upwards.
If these readings are different thats the real problem not air in the system. U can see pin disposals in RAVE - Electrical library - connector views - C0158

I'm telling u that cos a bad signal from this sensor is giving u difficult start symptoms