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2002-2005 Range Rover MkIII / L322
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20 Posts
Discussion Starter #1
Hi all

I had a problem with rough idle a few weeks ago and Chris57 helped me solve that (https://www.rangerovers.net/forum/6-range-rover-mark-iii-l322/328496-l322-td6-cutting-out-rough-idle-won-t-start.html).

Now I have starting issues with my L322 (TD6, 2002).
Sometimes it starts immediately but randomly (and mainly when warm) it won't start. It turns over fine but doesn't start. Normally it runs fine with no issues.
When it doesn't start the in-tank fuel pump is not running. Sometimes when the car has been left alone over night it starts again with no issues. But again it happens randomly.
So far I have replaced:
Battery, in-line fuel pump, fuel-filter, air-filter and fuel rail sensor.

When the car is running I don't get any fault codes from my GAP IIDControl fault code reader. When the car doesn't start i get the fault codes: 'P1180-04 Low side fuel pressure sensor plausibility (fuel filter) - pre-delivery pressure below starting required - General failure information -system internal failure' and code '0x09F6 Unknown'. I don't get any errors on the injectors. When running the voltage shows 13.9v.
I have ordered a in-tank fuel pump, but I'm worried it won't solve the problem since the problem happens randomly and the car is running fine when it's running.

Is there a sensor somewhere that tells the in-tank pump to start?

I could really need some input here since it's driving me crazy. Right now I'm stranded at a gas station where I just filled up my car and now it won't start.

Your input is highly appreciated.

Best regards

Kasper
 

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2002-2005 Range Rover MkIII / L322
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20 Posts
Discussion Starter #2
Hi all


I little quite in here... I could really need some help.


I have now replaced:

In-tank fuel pump
In-line fuel pump
Fuel filter
Air-filter
Battery
Fuel rail pressure sensor
The fuses looks fine and I have tried to switch the relays around


The car runs like a dream but randomly won't start when warm. The in-tank fuel pump doesn't start when when and I put on the ignition. When cold (after being left standing for 8 hours or more) the pump starts and the car jumps to start without any problems.



I could use some input on how to diagnose the problem. For example - what sensors tell the in-tank fuel pump to start when I turn the key to ignition? Will an injector leak prevent the in-tank fuel pump to start running?

If the crank positioning sensor is broken - will that prevent the pump from running?
Does the key have any effect on the pump when the car is unlocked?


So many questions that I could use some input on...



Best regards


Kasper
 

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Registered
2002-2005 Range Rover MkIII / L322
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22 Posts
Hello Kaspers, I can't help you for that problem but I can send you the Work Shop Manual Operation and the Workshop Manual Service Procedures for the Td6. I'm sure you will find the answers to all your questions. Just contact me on my email. Chris.
 

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2002-2005 Range Rover MkIII / L322
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Discussion Starter #4
Hi Chris

Thanks for you response.
I have access to Rave but my skills in reading the advanced diagrams are limited.
I have difficulties in finding the possible causes for my problem from the diagram.

But thanks for your offer.

/Kasper
 

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Registered
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372 Posts
Hi all


I little quite in here... I could really need some help.


I have now replaced:

In-tank fuel pump
In-line fuel pump
Fuel filter
Air-filter
Battery
Fuel rail pressure sensor
The fuses looks fine and I have tried to switch the relays around


The car runs like a dream but randomly won't start when warm. The in-tank fuel pump doesn't start when when and I put on the ignition. When cold (after being left standing for 8 hours or more) the pump starts and the car jumps to start without any problems.



I could use some input on how to diagnose the problem. For example - what sensors tell the in-tank fuel pump to start when I turn the key to ignition? Will an injector leak prevent the in-tank fuel pump to start running?

If the crank positioning sensor is broken - will that prevent the pump from running?
Does the key have any effect on the pump when the car is unlocked?


So many questions that I could use some input on...



Best regards


Kasper
Hi , from your above description and including the syptoms you provide about the codes , the issue may lie in fuel pressure. It's not about warm or cold , it's more about lapsed time. when you shut down the car for the night it has enough time to build up the correct fuel pressue overnight to start instantly in the morning, something you are unable to do when it is warm and has been running right?

What you need is to perform a fuel pressure test, i believe you can rent the test kit from autozone or advance auto if you are in the u.s or from a parts sales shop in your local.

On the fuel rail, there is a pressure release valve just like a bikes air purge valve , the pressure test gauge goes on there and you turn the ignition on and observe what that gauge does, its been a while sisnce i did this particular test but see if you can find the proper fuel pressure reading for your vehicle when the pump is on and observe to see what the gauge gives you over time , i.e note the reading when you plug it in and leave it then come back an hour later and see what the reading is then.. if it is lower you have a leak, if higher then you know pressure is building but you lose it upon start up or its not constant. That would tell you the pump is not funtioning properly if the filter is new.

So then the questions will be.. is it the pump? is it the filter? is it the injectors? where did you buy that pump? where did you buy that filter? are they the correct ones for the car?

in order for a gasoline vehicle to run you need three basic things
Air(regulated by your mass air flow sensor)
Fuel ( regulated by the pump , the injectors and filter quality)
Spark(regulated by the coils & spark plugs)
Each one has to be the right amount coming through in uniforf with the engines timing for the correct firing to happen.
I would start with the fuel since that is what the prognosis seems to suggest and work from there. It seems more like a lack of proper fuel pressure than anything else from what i gather.
All the best. Jack.
 

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2002-2005 Range Rover MkIII / L322
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Discussion Starter #6
Hi Jack
Thank you very much for your input - highly appreciated.
A few questions since I'm new to 'modern' diesel engines:
Will a lack of pressure in the fuel system prevent the in-tank pump from starting?
I'm not sure I understand how the pressure builds up, when the car is being left overnight without anything running?

I agree that it must be related to fuel since the in-tank pump is not running. I have tried once with quickstart in the inlet manifold but that didn't help either. Only lapsed time seem to help.

Again - great with some input Jack.

Best regards

Kasper
 

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Hi caspers , i missed the TD6 part indicating its a diesel , .. the advise i gave you is for a gsoline powered engine not a diesel. Since it's a diesel my apologies but i have notdealt with the situation on a diesel engine. So my advise is null in your case.

For a diesel engine to run you need fuel, air and compression.(The compression part may be the issue on a dieles engine) I cannot give you any further advise on this matter but would suggest you contact any diesel engine specialist and they might be able to help. the diesels engines operate differently as they have a unique cycle however it is still a fuel issue and where the fuel gets compressed to vaporization may be the a starting point if the pump and filter are OK.... Sorry i couldn't be of more help.... Jack.
 

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Discussion Starter #8
Hi Jack

Aahh - I see. I guess there's some differences in the fuel setup on the diesel vs. petrol.

I'm from Denmark (Europe) and the diesels are more common than petrol here in europe. It seems that itøs the opposite in the US.

But thanks anyway:).

Best regards

Kasper
 

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Yes Kaspers huge difference..
For a diesel engine to fire up you do not need a spark but the modern diesel do incorporate some electronic conrols these days.. i did some engineering with a danish friend a while back and he had a diesel generator that started using a crank handle... i have had landrovers in my vicinity from 1947 that use crank handles to start (no key) and they were diesels too.. so besides your fuel line which may be ok the bigger concern may be your fuel compression timing.. Best to speak to someone who knows the diesel engines better that i do.

In America our fuel is cheap compared to Europe so the mojority of us have gasoline engines...

BTW... something else to keep in mind with diesel engines,, they do not like any type of air in the fuel line delivery i know this from working with diesel generators.. a bleeding process needs to happen to remove air from the fuel lines in order for the engine to work correctly... usualy the highest point before the injector is your bleeding point.. if for any reason your engine is suckingin air instead of pure fuel you'll have issues.... but then it would not start in the morning either if that were the case....Jack.
 
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