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Td5 Discovery starting and running ( or lack of!)


Grant.
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Hi all,

Have a TD5 discovery (51 plate) that is a pig to start and if Im lucky, will drive maybe a mile or 2 before cutting out and not starting again ( until a whole battery of cranking has taken place.....)

So far, I have changed the Fuel filter (twice) The fuel sender unit, the fuel fitler housing and the fuel regulator.

Weve plugged it into Diagnostic, and we got no error codes or random values on screen.

Theres no apparent leaks on the fuel lines anywhere I can see.

From looking at the oil, there is no diesel contamination, so dont think it is injector seals

Completely ran out of things it could be now!

Any one else got any ideas?

Thanks

Grant

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Yep, checked for oil in ECU, tried a different ECU ( paired all the immobilisation and security settings across before anyone wonders) There was oil in the plug, a fair amount, however, the problem is too consistent, today we tried bypassing the inertia cut out switch, the EGR valve incase it was that, and bypassed and shorted the fuel relay across to keep the pump going, and the engine still cuts out. Only other thing I can thing about is the stop solenoid, however without a manual, we dont know which relay or fuse to pull!

SO now really scratching heads, with copious amounts of swearing! :angry:<_<

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There is no stop solenoid on a TD5.

I would check fuel pressure and flow (pressure of about 4 bar measured at fuel temp sender, flow of approx 1 litre / 20secs).

Have you tried changing the crank position sensor? That is the only sensor that will stop a TD5 running - all the others will default if they fail...

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Yep, checked for oil in ECU, tried a different ECU ( paired all the immobilisation and security settings across before anyone wonders) There was oil in the plug, a fair amount, however, the problem is too consistent, today we tried bypassing the inertia cut out switch, the EGR valve incase it was that, and bypassed and shorted the fuel relay across to keep the pump going, and the engine still cuts out. Only other thing I can thing about is the stop solenoid, however without a manual, we dont know which relay or fuse to pull!

SO now really scratching heads, with copious amounts of swearing! :angry:<_<

Does the fuel pump go noisy before it cuts out ?....if so its the injector seals or a cracked head.

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Had a pressure gauge on it, was reading approximately 3.5bar (so sub 4 bar, however the gauge wasn't calibrated precisely) however the needle was fluctuating a fair bit. thought about the crank position sensor, and as you said that is the only one that will stop a TD5 running, however, it is that consistent, so I dismissed it, however, its most likely worth a look.

The pump does go noisy, as if it is purging before it cuts out, however, the oil level isn't changing ( as i was told this would happen if the seals had gone),no smell of diesel either, there is no other apparent head cracking symptoms. unless im missing something? ( fingers crossed.... :P )

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Had a pressure gauge on it, was reading approximately 3.5bar (so sub 4 bar, however the gauge wasn't calibrated precisely) however the needle was fluctuating a fair bit. thought about the crank position sensor, and as you said that is the only one that will stop a TD5 running, however, it is that consistent, so I dismissed it, however, its most likely worth a look.

The pump does go noisy, as if it is purging before it cuts out, however, the oil level isn't changing ( as i was told this would happen if the seals had gone),no smell of diesel either, there is no other apparent head cracking symptoms. unless im missing something? ( fingers crossed.... :P )

Belive me mate....if the pump goes noisy then air is in the system....only place when the engine is running is seals and a cracked head....ask me how i know :huh:

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Also Si, if theres no stop solenoid, how does a td5 cut out? ( probably should have asked porny yesterday when I saw him! :P)

When the ignition goes off it cuts the power to the ecu and fuel pump relay thus stopping the injectors firing and so stops the engine.

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ah kk fair enough, so if thats the case, what stops the power going to the ECU?

Because I bypassed the relay for the fuel pump, so the pump stayed running constantly, and the engine still dies, the engine starts to miss on the first two injectors and then dies though...

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ah kk fair enough, so if thats the case, what stops the power going to the ECU?

Because I bypassed the relay for the fuel pump, so the pump stayed running constantly, and the engine still dies, the engine starts to miss on the first two injectors and then dies though...

The ignition switch cut the power to the ecu.....but if there is a crack or the copper washers on the injectors are shot then the cylinder pressure push's air into the internal fuel rail/channel and then stops the engine.

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Guest MRPLEBBY

Mine starts great, its the only diesel i have ever had where you dont have to wait for heaters, its starts first click any weather sinse the day i bought nearly 4 years ago, its a 2003 td5 discovery.

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