Discovery 4 2.7 diesel won't start

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Disco--Dave

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Posts
11
My 2010 2.7D discovery 4 cut out yesterday and saying reduced performance. It wouldn't restart and towed home. A friend connected a computer to carry out a diagnostics which only provided limited info and pointed towards a fuel problem. I'm wondering if the cam belt has broke, is there a way to check without stripping the timing case down.
Thanks
 
Nodge68 said:
How does it sound when cranking over? These engines are known to break crankshafts.
Click to expand...
hi it sounded fine just like it ran out of fuel, just checked the fuel pump drive belt hadn't failed, we were thinking about doing flow test on fuel leak off to see if an injector might be stuck open. Thanks
 
Disco--Dave said:
hi it sounded fine just like it ran out of fuel, just checked the fuel pump drive belt hadn't failed, we were thinking about doing flow test on fuel leak off to see if an injector might be stuck open. Thanks
Click to expand...
You can't do injector spill tests on these injectors, as they are pre-charged injectors. These injectors deliberately spill fuel into the spill line, which is held at 10 Bar by a pressure relief valve. If the valve fails to give 10 Bar, then the injectors won't deliver fuel.
However the valve seldom fails.
Have any codes been read?
 
Hi mate the fault codes read on snap on scanner low fuel level forced engine shut down and injector 1 low fuel pressure, I've had level gauge issues since owning and replaced it yesterday just as something to eliminate, gauge working fine now and reset codes, carried out fuel prime with scanner before trying to start it's just showing fuel pressure fault bank 1 now ?
 
Have you tried cracking an injector and then cranking it over to see if you have high pressure fuel in the rail?
 
Disco--Dave said:
Yes we have and pressure at the rail but it seems low pressure
Click to expand...

As said further up the thread is the hpfp drive belt still okay?

Could running out of fuel twice have damaged the hpfp?

I assume in tank pump is doing its thing?

There is a guide on lpfp testing on the D3 forum, think its called Robbies guide to lpfp testing?
 
Hi Yes we slipped the cover off the belt and had a feel at the belt and we think the belt is ok. I'll look for Robbie's guide. Thanks
Yes the in tank pump is doing its thing.
 
lynall said:
As said further up the thread is the hpfp drive belt still okay?

Could running out of fuel twice have damaged the hpfp?

I assume in tank pump is doing its thing?

There is a guide on lpfp testing on the D3 forum, think its called Robbies guide to lpfp testing?
Click to expand...
Hi I can't find Robbie's guide
 
If the ECM has shut the engine down due to low fuel levels, then rail pressure will be deliberately low, as the ECM will open the regulator valve.
The ECM needs to see a suitable amount of fuel, or the engine won't run.
You mentioned having fuel sender issues. I believe replacement level sensors (there could be 2) need calibration on installation, or they won't read the level correctly.
 
Hi all
I had a cut out and won't restart issue on my 2010 2.7 D disco, after much faffing I changed the fuel filter and it started and all was well for around 4 weeks and then I had exactly the same symptoms as previously so I fitted a new filter again but this time it wouldn't start, I've not had a gauge on it but the low pressure pump is working.
Maybe coincidental but before it cut out this time twice I had a warning on the dash saying key not detected, I doubt it but could it be an immobiliser fault?
Please can anyone tell me how to check the high pressure system.
Thanks
 
Hi

yes an immobiliser issue can cut the engine out if there’s an error , alas normally will disable the starter motor itself

when trying to start it does the red flashing light go out

there are reports of dry solder joints on the back of the instrument cluster , however I wonder if it would be worth checking the canbus to ensure all the modules are talking with one another

plus know on the D4 the 3.0 fuel pump belt is timed however isnt on the early 2.7

did u also test to see what the LPFP pressure is at the test pint on the back of the engine , also when u had the engine running what the injector offset values were at idle plse

hope u get it resolved
 
Last edited:
Nodge68 said:
You can't do injector spill tests on these injectors, as they are pre-charged injectors. These injectors deliberately spill fuel into the spill line, which is held at 10 Bar by a pressure relief valve. If the valve fails to give 10 Bar, then the injectors won't deliver fuel.
However the valve seldom fails.
Have any codes been read?
Click to expand...

hi mate

sorry for the daft question but is that a different test plse as see some on the D3 forum do an injector leak off test where they have the unit where it shows the quantity of fuel from each injector

Many thks and once again apologises for the daft question
 
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