HELP - Disco 2 Td5 cranking but not starting - Fixed?

then the voltage drop is ruled out

sierrafery said:

then the voltage drop is ruled out

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Cool that is something. I just can't believe it is starting the whole morning now. I will leave it for a few hours before I try again. I will check the wires in the mean time.

unplug the ECU red plug(disconnect battery first), insert probes of multimeter set on ohms into cavities 13 and 36 and jiggle the wiring starting from the sensor untill you can reach... if you see big variations eventually open circuit then that's the problem

BTW. dont force the probes into the plug to not enlarge the connections, insert thin needles or wires and measure on those

cheers will try that. The bugger has started the whole day but... the MIL came on "(15.2) high speed crank (logged)"
I located the crank sensor under the sound insulation. Very hard to reach because of that but I am able to just about jiggle the wires.

IMO better prepare yourself to buy a sensor NSC100790, aftermarket is not good, you need at least OEM

sierrafery said:

IMO better prepare yourself to buy a sensor NSC100790, aftermarket is not good, you need at least OEM

Click to expand...

I was ready to buy the whole lot if it persisted so only the sensor is grand. ;-)
Would that also be the cause of the way it runs irregular?

yes, corroborated with the "tired" injector harness which you should change too, ASAP... just make sure that the crank sensor's plug/wiring is OK cos the contacts in the plug used to loosen due to the 'unfriendly' environment...that's why these kits are well sold: http://www.ebay.co.uk/itm/landrover...-kit-discovery-td5-defender-td5-/251316693883

sierrafery said:

yes, corroborated with the "tired" injector harness which you should change too, ASAP... just make sure that the crank sensor's plug/wiring is OK cos the contacts in the plug used to loosen due to the 'unfriendly' environment...that's why these kits are well sold: http://www.ebay.co.uk/itm/landrover...-kit-discovery-td5-defender-td5-/251316693883

Click to expand...

Cheers. I will replace that wiring as it is awkward to reach thanks to the sound proving. I will replace the harness as well as the engine was running brilliantly before all this happened.

sierrafery said:

IMO better prepare yourself to buy a sensor NSC100790, aftermarket is not good, you need at least OEM

Click to expand...

You say at least OEM? Are there better ones?

A massive thank you for your time by the way!!!!!

I will replace the lot and let you know the progress.

tulipandthistle said:

You say at least OEM? Are there better ones?

Click to expand...

yes, the best is Genuine but too expensive and OEM works ok

Finally refused to start, only once. After that it started again. I managed to take the engine speed while it didn't start under instruments it gave engine speed 0.
The cylinder balance while running:
1 = -3
2 = -13
3 = -8
4 = 18
5 = 6

We tried to get a measurement out of the red connector (pin 36 and 13) we measured no connection at all (will try this again with wire instead of paperclips tomorrow)

rough balance, but it could be due to the harness, instrument mode might not be the most accurate in this area, next time check in ''INPUTS FUELING'' though the crank sensor is hardwired to the ECM so you must get resistance reading in those pins

sierrafery said:

rough balance, but it could be due to the harness, instrument mode might not be the most accurate in this area, next time check in ''INPUTS FUELING'' though the crank sensor is hardwired to the ECM so you must get resistance reading in those pins

Click to expand...

Previous measurements of engine speed were from "INPUTS FUELING" only this time not. I will use something else to put in the wires, I think I didn't get them properly.

Just as an update while I wait for parts, car has started every time since I ordered the parts. It is like going to the dentist because your tooth hurts and it stops hurting the moment you booked your appointment. LOL

classic case of intermittent crank sensor/circuit failure imo, especially that you've got thar high speed crank code at the end...

sierrafery said:

classic case of intermittent crank sensor/circuit failure imo, especially that you've got thar high speed crank code at the end.

Click to expand...

I have ordered a new sensor, connector and harness. I hope to have them for the weekend so I can put them in.
I will report back when it is done.

Thanks again!!

the crank sensor when it starts to fail it becomes sensitive to heat so if after a longer drive it refuses to start cool it with some water, dry it with a towel and try then... if it starts then that's it

good to know, I will get it warmed well and see if it fails and try that.