Overworked · Nov 25, 2018

Hi all.
Ok I have a td5 discovery.started having starting problem.once it runs it runs great.i replaced fuel filter,glow plugs,and sensor.
If the car runs,and I turn engine off.then won't start again.
I saw a previous thread with another member that has starting issues.
So I followed a four step procedure.it stated that the starter motor could be the trouble.so I tried bump starting four times and it started all four times.so am I correct in assuming that the starter is causing the issue.many thanks

sierrafery · Nov 25, 2018

Yes the starter is something to be ruled out in this case

Overworked · Nov 25, 2018

Sorry to sound stupid,are you saying the starter is not causing the problem.when I crank it measures about 10 volt.and won't start but bumping the car does start

sierrafery · Nov 25, 2018

I meant that yes you must rule out the starter by replacing it

brian47 · Nov 25, 2018

Overworked said:
Sorry to sound stupid,are you saying the starter is not causing the problem.when I crank it measures about 10 volt.and won't start but bumping the car does start

A battery voltage of 10 volts while the engine is cranking isn't going to help the ECU. You need at least 10.5 volts for the ECU to trigger the injectors.
The low voltage could probably be the final cause of the failure to start, but the cause of the low voltage must be found and corrected first.
As @sierrafery has already suggested it could well be a starter motor fault dragging the voltage down or it could be due to a weak, aging battery or a fault in the battery charging circuit.

Overworked · Nov 25, 2018

Ok thanks,a new starter next then

Si Click · Nov 25, 2018

As the starter itself is working, you may only need to refurbish the solenoid to prevent arcing. You can get a solenoid refurbishment kit for about £10 and it is a very simple procedure.

sierrafery · Nov 25, 2018

Si Click said:
As the starter itself is working, you may only need to refurbish the solenoid to prevent arcing. You can get a solenoid refurbishment kit for about £10 and it is a very simple procedure.

As i said in other post IMO it's a starter motor's internal issue not solenoid arching cos that would not create a so big voltage drop which is the main cause of the non starting, if it's about arching that happens on the collector or within the winding, a solenoid repair kit won't help with this... the fact that the motor is turning over doesnt mean it's in perfect order especially if it creates a such big voltage drop

Ian M in France · Nov 25, 2018

it could be the battery or charging system, try using jump leads both with the over car running then without, check voltage if starts without other car not running I would have battery checked, if starts only with other other car running and voltage is above 10.5v might be starter motor solenoid as the extra volts just get all working, also check voltage when running to make sure it is charging should go up to over 14.2v

Overworked · Nov 25, 2018

Ok thanks for all help.charging system is working, charging 14+ volts.
Will try the jump thing tomorrow and keep posted,but car is charging ok,so will measure battery voltage before starting to see if battery is suspect

Overworked · Nov 25, 2018

I will probably replace the starter motor completely and then hopefully won't have to address it again

Si Click · Nov 26, 2018

sierrafery said:
As i said in other post IMO it's a starter motor's internal issue not solenoid arching cos that would not create a so big voltage drop which is the main cause of the non starting, if it's about arching that happens on the collector or within the winding, a solenoid repair kit won't help with this... the fact that the motor is turning over doesnt mean it's in perfect order especially if it creates a such big voltage drop

I'm not suggesting that the solenoid is causing a major voltage drop, but that the issue may be arcing from the solenoid causing electromagnetic interference with the crank position sensor. This would cause the ECU to prevent engine start and give the symptoms the Overworked has described.
If he is going to pull the starter anyway it costs nothing to open up the solenoid and check the contacts. If there is evidence of serious arcing then a solenoid rebuild kit may solve the problem without having to buy a whole new starter.

sierrafery · Nov 26, 2018

IMO the problem here is the voltage drop which can't be caused by the solenoid

Overworked said:
I crank it measures about 10 volt.and won't start but bumping the car does start

Overworked

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Overworked

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Ian M in France

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