L

Lewis88

New Member
Hi everyone, I have a defender 110 DCPU which broken down on me two weeks ago. I was slowing down to enter a roundabout and after navigating the roundabout itself I put my foot on the accelerator but it just died. Put more diesel in it as it was turning over slightly fast and appeared to be fuel starvation.

I have since checked all earths and fuses but haven’t found anything wrong. I then done the fuel filter head, fuel filter, crank position sensor and bled the system multiple times. I have now changed the fuel pump to a Lucas one and it’s no different. Oil level hasn’t changed so I don’t think that the injector washers are at fault. I have checked the inertia switch but it seems fine.

Any ideas? Is there a way to test that the ecu is giving signal to the injectors? I don’t have any diagnostics but have access to icarsoft if that would help.
 
You will need diagnostics and help from someone with more knowledge than me. I'm sure they will be along soon.
Lucas is not a good make for a fuel pump.
 
You have mentioned changing the fuel pump but I assume the fuel pump is actually running when you try to start it? i had this issue with mine that i never tracked down but the fuel pump would occasionally fail to start and the engine would just turn over and not run. A quick wiggle of the under seat relay would kick the fuel pump in and the engine would start. never did get tot he bottom of the issue.
 
Kev12 said:
Have you checked that the rockers are moving?
Click to expand...
I haven’t as yet, it doesn’t sound massively faster just just a fraction quicker to turn over. I have checked out the fuel pump relay but it was fine, can hear the audible click where it energises and there was fuel at the regulator. I feared that it may not be high pressure enough so changed the pump anyway - hasn’t made a difference. I can however hear the pump functioning and it did purge air.
 
Agree with above diag would give a clue, until then there are simple things like check for air filter blockage and I believe CPS wiring is prone to chafing
 
Try pressing the fuel cut off inertia switch button on the bulkhead, my TD5 did not start one day and thats what it was, it must have tripped shutting off the fuel, after resetting the switch it fired up instantly.
 
Thanks for the replies guys, I feared that it may be the capacitors on the ecu! Did look for ways to see if I can test the output from the ECU to the injector but I don't have an oscilloscope. I tried scanning it with a rather pricey OBD scanner, but it wasn’t OBD1 compatible. But I have an update!

After fearing that the ECU wasn’t communicating with the OBD socket at all, I put it on charge and cranked it over, absolutely no sign of life! I then done the priming sequence 5 times and put my foot to the floor, it had a bit of a splitter! 3 or 4 more attempts and it started as per usual! Back running now guys. Couldn’t tell you if it was the fuel filter, filter head or pump but I do know that it had an airlock somewhere along the way after the breakdown. Thanks for the input everyone, so relieved that it’s not the ECU!
 
Lewis88 said:
Thanks for the replies guys, I feared that it may be the capacitors on the ecu! Did look for ways to see if I can test the output from the ECU to the injector but I don't have an oscilloscope. I tried scanning it with a rather pricey OBD scanner, but it wasn’t OBD1 compatible. But I have an update!

After fearing that the ECU wasn’t communicating with the OBD socket at all, I put it on charge and cranked it over, absolutely no sign of life! I then done the priming sequence 5 times and put my foot to the floor, it had a bit of a splitter! 3 or 4 more attempts and it started as per usual! Back running now guys. Couldn’t tell you if it was the fuel filter, filter head or pump but I do know that it had an airlock somewhere along the way after the breakdown. Thanks for the input everyone, so relieved that it’s not the ECU!
Click to expand...
Fingers crossed it stays fixed.
 
Agreed, I think that it was the fuel pump that went pop. Even though it appeared to be providing sufficient pressure!
 
dag019 said:
You have mentioned changing the fuel pump but I assume the fuel pump is actually running when you try to start it? i had this issue with mine that i never tracked down but the fuel pump would occasionally fail to start and the engine would just turn over and not run. A quick wiggle of the under seat relay would kick the fuel pump in and the engine would start. never did get tot he bottom of the issue.
Click to expand...
I had exactly the same issue, I put it down to a faulty relay socket as I swapped the relay and it still did it. I knew when I had a problem as the glow plug light never came on and the temperature gauge went straight to the red, even though it was cold.
 
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