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Old 11th August 2012, 16:58   #1
SteveT
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Default Diesel cut out at 80mph and won't restart

Diesel Tourer 2.0 CDT automatic, 131PS, 93k miles.

So, I'm going along the dual carriageway at 80-85mph. I think I might have noticed some hesitation a moment earlier when I was accelerating the engine past 4000rpm in 4th gear on an incline.

Suddenly, at the top of the hill, the engine cuts out. No warning signs (apart from that possible hesitation), no warning lights or messages on the dash, just cuts dead, like I've turned off the ignition.

The only thing I noticed was the oil pressure warning came on after a few moments, which of course you'd expect if the engine stops without you turning off the ignition first.

Coast to a halt. Engine bay is perfectly clean - no oil or debris anywhere. Engine spins over nicely on the starter, compressions sound even and good, but makes absolutely no attempt to fire.

My first thought was fuel pump failure. But haven't I read that it will still run if only one of them is working? I wasn't able to listen for the pump noise because there was just too much traffic noise.

I got a tow and at the moment it's at my mum's place, from where I'll probably have to get it recovered to the nearest Rover specialist.

I wouldn't ask anyone to diagnose this problem remotely, but is there a known failure mode in our cars (diesel, remember) which is known to cause this type of breakdown? All other thoughts and suggestions very welcome.

Thanks,

Steve
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Old 11th August 2012, 17:04   #2
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The oil warning light came on because the engine stopped. That's perfectly normal and unrelated..

Sounds to me as though you have an injector started leaking so the common rail pressure dropped causing the ECU to stop the engine...

Do an injector leakback test. A search on here will give full info on how-to do it..
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Old 11th August 2012, 17:19   #3
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It happen to me and was because i'd let fuel drop below 1/4 tank full, in tank pump isnt working even though under bonnet is fine.
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Old 11th August 2012, 17:33   #4
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i would say the pumps have failed re james theory if a injector was leaking the car should not cut out after all the engines running so what difference is a leaking injector going to make? try tapping your under bonnet fuel pump see if you can get the car started
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Old 11th August 2012, 17:42   #5
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The ECU shuts the engine down if the fuel rail pressure drops to save damaging the HP pump. If the car restarts then could well be due to a leaking injector or injectors, but as it didn't then best start by checking the LP side.

Remove the pipe from UBP where it enters the fuel filter and place it in a large jar then with key to position 2 you should get a strong flow of fuel. If it is slurping like a kid finishing a milkshake through a straw then likely ITP has failed.

If you have less than a quarter of a tank of fuel worth filling it up anyway to rule out the ITP.

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Old 11th August 2012, 17:57   #6
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Quote:
Originally Posted by Mike Noc View Post
The ECU shuts the engine down if the fuel rail pressure drops to save damaging the HP pump. If the car restarts then could well be due to a leaking injector or injectors.

Easy to check if the LP pumps are running and if you have less than a quarter of a tank of fuel worth filling it up to rule out the ITP.

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Old 11th August 2012, 18:06   #7
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I'm with you on this one Mark - failure of the LP pump side.

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Old 11th August 2012, 18:19   #8
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1st thing to always check when this happens is how much fuel is in the tank? In my experience you can hear an under bonnet pump (UBP) over traffic, so I would guess the in tank pump (ITP) has failed some time ago and the ITP has now given up the ghost. A good strong tap on the top of it may get it work for a while, or several years, I would replace it however. They're not expensive and not too difficult to do.

If it was a leaking injector it can do this but only if you go for a sudden increase in throttle such as during an overtake, in my experience.

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Old 11th August 2012, 19:26   #9
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>>>the engines running so what difference is a leaking injector going to make?<<<

The pressure drops in the common rail to a level low enough for the ECU to shut the engine down.. I had it happen to me several times before I got chance to replace the injector..

The pumps are the first port of call if the tank is below 1/4 full though..
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Old 11th August 2012, 20:23   #10
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Quote:
Originally Posted by James.uk View Post
>>>the engines running so what difference is a leaking injector going to make?<<<

The pressure drops in the common rail to a level low enough for the ECU to shut the engine down.. I had it happen to me several times before I got chance to replace the injector..

The pumps are the first port of call if the tank is below 1/4 full though..
...
just been pricing up injectors mines sometimes missing and smoking on start up not cheap are they
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