Td5 D90 question - odd problem!
Discussion
Ok, so I have a Td5 D90 with a PSi Tuning box, intercooler, and exhaust.
It has recently developed an annoying problem where when driven hard (if that is a possible term with a Defender) that it goes 'flat'. It is often at a point where its under load and it will suddenly drop back in performance. When it does that it will still rev OK and it will still do 70mph in top but its definitely not right. It doesn't do it at a consistent point in a journey, sometimes after 3 miles sometimes after 30 miles. It doesn't feel like an obvious misfire and it runs ok at idle when its done it, its just short on power.
I've pulled the ECU plugs and checked them and they seem fine, but I cleaned them with contact cleaner and no difference.
I disconntected the MAF, no difference, still exactly the same.
I was wondering about a failing pump?
When I stick my head in the rear right arch with the engine on tick over you can hear the pump whining in a consistent but high pitch whine. Is that normal? Could someone listen to theirs and tell me if theirs does it?
Also with the ECU/fuse box cover off and at tick over when depressing and releasing the throttle to rev the car there is something in the fuse box clicking - now I've never had the cover off whilst doing this before so again don't know if this is standard?!
Any thoughts on potential causes?
It has recently developed an annoying problem where when driven hard (if that is a possible term with a Defender) that it goes 'flat'. It is often at a point where its under load and it will suddenly drop back in performance. When it does that it will still rev OK and it will still do 70mph in top but its definitely not right. It doesn't do it at a consistent point in a journey, sometimes after 3 miles sometimes after 30 miles. It doesn't feel like an obvious misfire and it runs ok at idle when its done it, its just short on power.
I've pulled the ECU plugs and checked them and they seem fine, but I cleaned them with contact cleaner and no difference.
I disconntected the MAF, no difference, still exactly the same.
I was wondering about a failing pump?
When I stick my head in the rear right arch with the engine on tick over you can hear the pump whining in a consistent but high pitch whine. Is that normal? Could someone listen to theirs and tell me if theirs does it?
Also with the ECU/fuse box cover off and at tick over when depressing and releasing the throttle to rev the car there is something in the fuse box clicking - now I've never had the cover off whilst doing this before so again don't know if this is standard?!
Any thoughts on potential causes?
Agree that could be one of the causes - presumably its likely therefore to be wastegate actuator, but its strange the inconsistency of it. I've never had one fall into 'limp mode' to know how quick they will go in limp but it doesn't feel as remarkably slow as say limp on my old Mini, but then I suppose the speed differential should be greater as the Defender is slower to start with.
Anyone done a wastegate acutator, someone previously suggested they just got stuck and could be freed off and lubed?
Thanks
Anyone done a wastegate acutator, someone previously suggested they just got stuck and could be freed off and lubed?
Thanks
Variable vane turbos are prone to this Not sure the landy is so sophisticated but...
On an L200 i used to get the problem when coasting into roundabouts on light throttle 4th gear, checking clear , dropping to third and accellerating away, turbo would overboost and ecu would hold the car back preventing any rise in revs...ended up plugging in a boost gauge on the move to test for the problem. it became almost dangerous when overtaking etc.
N.
On an L200 i used to get the problem when coasting into roundabouts on light throttle 4th gear, checking clear , dropping to third and accellerating away, turbo would overboost and ecu would hold the car back preventing any rise in revs...ended up plugging in a boost gauge on the move to test for the problem. it became almost dangerous when overtaking etc.
N.
if the in-tank fuel pump is making a high pitch whinnig ,than you have aeration in the fuel.this can be caused by a fuel filter fault,in-tank fuel pump or injector sealing washers.have you had the engine ecu checked for fault codes.if no fault codes than check fuel pressures - at the fuel pressure regulator you should have 4 bar & at the fuel filter head .75 bar.if these pressures are ok than suspect the injector sealing washes are worn.have a good look at the injector seats too down in cylinder head ,as cracks can occur in this area as well as the fuel gallery(also in the cylinder head and these you will not see and can only be high lighted by bench testing) you mention that you disconnected the MAF sensor and made no differance - i would have this double checked on landrover diagnostic equipment as these do give alot of problems.
Thanks for all the feedback chaps.
Need to get it into the garage and have the fuel pressure checked I think, but it's odd that it seems to be inconsistent in this regard, wondered if it had picked up some dirt in the tank.
On a good run back from shooting on Exmoor last night it was cruising on the M5 at 75mph fine but had nothing when putting your foot down, normally it will do 95mph plus, where it is legal to do so obviously!
I think I am going to get the injector loom changed regardless to rule this out and also get the fuel pressure regulator checked as I suspect this may be part of the issue, I notice this morning for the first time slight marks, spotting if you like, of an oily substance on the rear of the truck but probably not dense enough for oil but might be right for diesel.
I plan to check the waste gate and remove the EGR valve anyway so that will rule those out. It missed slightly on start up this morning too, firing on 3 or 4 and clearing after a few seconds, could just be cold but again wondered if fuel pressure or injector loom related.
Need to get it into the garage and have the fuel pressure checked I think, but it's odd that it seems to be inconsistent in this regard, wondered if it had picked up some dirt in the tank.
On a good run back from shooting on Exmoor last night it was cruising on the M5 at 75mph fine but had nothing when putting your foot down, normally it will do 95mph plus, where it is legal to do so obviously!
I think I am going to get the injector loom changed regardless to rule this out and also get the fuel pressure regulator checked as I suspect this may be part of the issue, I notice this morning for the first time slight marks, spotting if you like, of an oily substance on the rear of the truck but probably not dense enough for oil but might be right for diesel.
I plan to check the waste gate and remove the EGR valve anyway so that will rule those out. It missed slightly on start up this morning too, firing on 3 or 4 and clearing after a few seconds, could just be cold but again wondered if fuel pressure or injector loom related.
I had similar issues with my old TD5 Disco, it went fine up to around 40mph but after that flat as a pancake, nothing
I replaced the fuel filter, injector loom, checked the Actuator (it was fine) cleaned the MAP sensor on the inlet, removed the EGR and bypassed the turbo boost valve, IIRC the defender doesn't have such a valve though
After doing all of the above, different vehicle altogether, sadly i did everything at once and cannot say what was at fault but one of the above caused it
Id also recommend getting silicon boost hoses as mine were getting sucked in just as i got rid of it
I replaced the fuel filter, injector loom, checked the Actuator (it was fine) cleaned the MAP sensor on the inlet, removed the EGR and bypassed the turbo boost valve, IIRC the defender doesn't have such a valve though
After doing all of the above, different vehicle altogether, sadly i did everything at once and cannot say what was at fault but one of the above caused it
Id also recommend getting silicon boost hoses as mine were getting sucked in just as i got rid of it
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