TD5 Backfire / Cutting out / Driving me mad

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Grannville

New Member
Posts
5
Location
Skye
Hi Guys

I'll cut to the chase.

I have 2006 TD5 110

I use it quite alot but not everyday to set the scene.

I was returning from a job - engine cold but not stone cold and while driving I felt the engine misfire, it repeated this a couple of times and then ran fine. I made it home 30 miles or so.

The next day I went to set out and after 5 mins of driving (engine warmed up for 10 minutes before leaving) it cut out and restarted on the key, cut again and I turned back home. Drained the fuel tap from the filter - some water nothing crazy - im on the isle of skye so.... all buckled back up pump prime sequence, engine started and backfired once and then ran fine for 2 hours of driving, I did some work for a few hours, cold engine started fine, drove back home.

The day after it was snowing so I though oh no! (brilliant) jumped in Django and set off, got about 20 mins in and the engine strutter and a started to lose power until it finally cut out again, quick road side fuel filter drain and pump priming sequence, retarted and i finished my journey.

Changed the fuel filter and cut the old one up - not too bad. now the engine will only backfire on starting i.e its injecting at the round time sort of sound diesel snapping. if the pump is primed once or twice the engine runs ok occasionally giving a little backfire but more often than not runs ok when warmed up. certainly will not entertain running cold.

I have so far changed the

fuel filter (twice - genuine)
filter housing as the air bleed valve was blocked
regulator assembly on the head including cleaning the last chance filter - running at 4.5 bar before and 4 bar now
all injectors - recoded correctly using test book
I have inspected the quality of the fuel to the rail using an optical block. No air after running and no huge amount of air just before misfire etc.
Tank pump sounds fine and is delivering good pressure despite being alittle loud now the regulator is reduction the free pressure.
The ecu is not long back from a ECU testing repair job - none start no fuel pump prime issue
Ive change the fuel rail wiring harness in the head,
no oil in sockets etc.

getting a bit sick of it now as you might imagine.

I have some fault codes which clear down fine and reappear with a backfire stall of the engine here they are:



FAULT 27-04 injector 4 peak charge long (CURRENT)

FAULT 27-05 injector 5 peak charge long (CURRENT)

FAULT 28-01 injector 1 peak charge short (CURRENT)

FAULT 28-02 injector 2 peak charge short (CURRENT)

FAULT 28-03 injector 3 peak charge short (CURRENT)

FAULT 28-04 injector 4 peak charge short (CURRENT)

FAULT 28-05 injector 5 peak charge short (CURRENT)

FAULT 31-01 injector 1 open circuit (CURRENT)

FAULT 31-02 injector 2 open circuit (CURRENT)

FAULT 31-03 injector 3 open circuit (CURRENT)

FAULT 31-04 injector 4 open circuit (CURRENT)

FAULT 31-05 injector 5 open circuit (CURRENT)

BOTTOMSIDE CURRENT TRIP LOGGED - Cannot find any info on this one

Any ideas before I dig a hole a bury it?

Suspect ECU however very strange it seems to run ok when warm, ive given the wiring harness a good pull tug and havent discovered anything as of yet.

All opinions welcomed!
 
I had those faults a couple of years ago, tried all sorts replaced crank sensor, and fuel pressure regulator, new injector harness, then sent ECU to be tested, they said it's fine but we can repair it for you (about £350).
Found a S/H one on e bay from a Discovery and bought it, worked fine immediately even before I re programmed it (gauge is reversed) then I re programmed it and been OK since.
The codes relate to injector control and from what I read people were suggesting that th capacitors on the board are suspect, and need to be replaced, but I don't have the depth of experience in electronics to comment on that.
 
Im suspecting as much too, did you have the same symptoms? its the strangeness of the running when warm thats really throwing me off.
 
Im suspecting as much too, did you have the same symptoms? its the strangeness of the running when warm thats really throwing me off.
Faulty ecu might not be seeing the fuel temp sensor input, or coolant sensor input so doesn’t adjust the fuel map to take into account actual temps
 
Im suspecting as much too, did you have the same symptoms? its the strangeness of the running when warm thats really throwing me off.
My symptoms were a bit different, it started to cut out when hot, but it restarted immediately, it did me on the A1 one day.

Then went out to it one morning and it refused to start, tried a few things and found the fault codes (try googling the injector peak ones) sent away the ECU, and that's when I did the crank sensor and harness. I also took the chassis earths off and cleaned them, when it came back I managed to start it, but at the same time found the S/H ECU.
Fitted the second ECU and it's fine.
Put a full wiring harness in last year when I re built the engine.
See if I can find the thread.

Here
May be some help dont know
https://www.landyzone.co.uk/land-rover/crankshaft-sensor-spacer.308563/page-2
 
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Unfortunately the pics are missing in the post(i recovered two from the web) but the harness section between the head and ECU with the injector's wires was chaffed where it crosses near the bottom of the engine(can happen to Defender as well), the guy soldered the wires but a simpler fix would be to replace the engine harness: https://www.landyzone.co.uk/land-rover/td5-misfiring-and-cutting-out-problem-finally-solved.125039/ i've seen such fault two more times since then, once on defender... though the ECU should be ruled out too

voFIMG02resizbWE.jpg


F8SIMG040resiie4.jpg
 
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