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2001 discovery TD5 engine cut off help needed


Desert Cat
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Its started a week ago, while climbing a seep hill at the desert, the engine was cut off like the fuel ended.

Closing the switch and restart the engine, it start immediately with no hesitation, no pedal was needed.

while driving a steep slope down, no issue with engine, all is well.

Drove home for 100KM up and down on the roads, no problem occurred, normal gear change and top RPM for gear change was 4200RPM as normal from my 7 years experience with this car.

I can reproduce the cut-off each time I step on a high rock with my front left wheel, then the engine cut-off, doing the same with the front right wheel the scenario does NOT happen

Driving fast in the round-about fast enough (Left hand side driver) the car gets a big roll over to the right, the engine cuts off.

So I have two actions help me reproduce this engine cut-off:

1. Climbing a large rock with front left wheel.

2. Driving fast in a round-about.

I had some suspicious with the following:

1. Genuine Fuel filter - was replaced- symptom 1 was happening, symptom 1 was happening.

2. Replaced fuel pump - OEM Bearmach - symptom 1 was happening, symptom 2 was gone.

3. Bypass the Interia switch - symptom 1 was happening, symptom 1 was happening.

Maybe Fuel Pressure regulator?

Electric issue?

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2001 Discovery TD5, black smoke while engine starts to choke.

Same behaviour when tank is 1/2 or full.

Replaced for a new BEARMACH OEM fuel pump - no change.

I have a NANOCOM connected, and right after the engine cut-out I get a message "all five injectors (1-5) output drive peak charge is too long".

Slided back from the steep rock I drove on with left front wheel to simulate the cut-off with engine off, closed starting switch and re-start, it start immediately.
I had some suspicious with the following:
1. Genuine Fuel filter - was replaced- symptom 1 was happening, symptom 1 was happening.
2. Replaced fuel pump - OEM Bearmach - symptom 1 was happening, symptom 2 was gone.
3. Bypass the Interia switch - symptom 1 was happening, symptom 1 was happening.
all five injectors (1-5) output drive peak charge is too long
This is what I found on the www to check:
1. Check the ECU Earth - Not sure how to do this...
2. Check the Main Relay under the passengers seat - Not sure which relays.
3. Check for Oil on Red ECU Plug and Clean - Done, very little oil before cleaning - No change
4. Check Battery Voltage is Between 9V & 16V - Done, in range.
5. Test Injectors Using Nanocom - OK when idle
6. Check Cylinder Balances with Nanocom - balanced on idle - NOT balanced during cut-out.
7. Check both ECM Connectors - Both OK no oil - Done - No change
8. Use Injector Cleaner - liqui moly diesel injector cleaner super - Done - No change
9. Check Circuit Integrity from ECM to injector harness via engine harness connection - How to perform this
Any other ideas?
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Is the ECU standard or "chipped"?

It sounds electrical, if not the control unit acting up. Inspect the engine harness very careful for chafing, it seems when the chassis is twisted a certain way the wires short somehow.

Good luck, these are very tough faults to hunt down.

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Your ideas are very successful.

Further more, opening the intercooler hoses and seeking for tons of oil, gladly I didn't find a drop, dry as a desert as should be (2 years old turbo) so it's not the way to go.



I decided to go the "electric way" as I was told by several forum members all over the world (yes, UK, US and OZI...).

After verifying I don't have excessive amount of oil in the ECU red connector, I had removed all the sleeves surrounding the wires going from connector C0171 to the ECU, and closely examin for any physical damage, well I didn't find any, but I had uses excessive amount of carburetor cleaning spray all over the C0171 connector all over, having ANY trace of oil to come out, sprayed also the wires themselves, making it easier to observe for any physical damage without the greasy layer they had.



After cleaning all electrical connectors both C0171 engine harness side and ECU side C0158, i headed for the test drive.

As I was experienced from the past, climbing with the front left wheel high enough to cut-out the engine (~ 1 meter rock) this time, surprize, the engine was still running ! but with very slight misfiring.



Drove back home and realized the logic behind engine cut-off / misfiring while the engine was tilted to the right (left front wheel up, engine tilted to the right), the injector loom is soaking with oil under the engine cover.



No escape for the fifth injector loom replacement...

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