TD5 severe loss of power misfiring.

Hi all
I've owned a disco td5 2001 now for 2 years and for all this time its been severely underpowered. Recently though with the cold its been severely underpowered but also really struggling to start. It fires then cuts out immediately a couple of times then eventually it catches and runs like a bag of spanners for a few minutes then runs relatively ok. Things i've tried in last 2 years :- new turbo hoses, freeeing off turbo atuator linkage, fuel pump genuine, fuel regulator (leaking) including little gauze filter, epg blanking kit fitted, maf meter, injector copper washers. Sensor on inlet manifold cleaned. Think thats it. Turbo spins and all outputs on computer check out ok although to me i can never hear the turbo kicking in and never have done In fact everything checks out ok on the computer apart from cylinder compressions they are all over on the computer. Someone has suggested a blocked exhaust catalytic converter could cause the cylinder compression variations and low power. Does anyone out there have any other suggestions as to what else could cause this.
Many thanks for taking the time to read this cheers george
Think tha

Change the fuel filter. Check the one way valve in the fuel filter body. Get rid of the catalytic convertor. Make sure your intercooler hoses are not collapsing/leaking. Get your injectors tested and cleaned. Make sure turbo is not overboosting or your ECU will keep switching to limp mode.

Make sure red plug on ecu isn't full of oil. Can cause running problems

Yes thanks for the quick replies. I have changed fuel filter at least a couple of times and intercooler hoses when i did turbo hoses. and no oil in red plug. Power did seem down when injector washers were replaced but they assured me injectors were put back in same position. To be honest i've spent so much time and money trying to sort this problem out it seems that the experts are just guessing and i pick up the tab. There seems an endless supply of possible causes on td5 for loss of power. How likely is it to be injectors are they prone to failure. Many thanks again

wont hurt a new(genuine) CKP sensor either, or at least check the old one's wiring and plug

Hi thanks whats the ckp sensor

Gbbmotors said:

Hi thanks whats the ckp sensor

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Crankshaft position sensor, on the back of the engine near the FPR.......difficult start is one of this sensor failure's/wrong output's symptom

You talk about the cylinder compressions being all over the place.Are you talking about the cylinder balancing whilst running OR an electronic compression test via oscilliscope whilst cranking ?
The latter would be a good idea,I've seen a few TD5's where the ecu was unable to balance the engine properly because the compression was poor on one cylinder or more.Usually down to a bent con rod....
If the compressions are all equal then you probably have blocked or dribbling injector nozzles.
You also mention cleaning the sensor on the inlet manifold,I assume you mean the manifold pressure sensor - cleaning it is fine,but does it show any boost under load ? You should get up to 230kpa at as little as 2100rpm under load,if the ecu does not see boost it will not put fuel there to make power with it.

Hi yes cylinder compressions when running are all over on all 5 cylinders all fluctuating. Under load garage said compressions should all even out. To be honest i was only watching the garage put the computer on so not sure what most of the values meant. Would the ckp faulty also cause the lack of power. Another thing is car struggles to rev over 2500 just feels completely flat.

Gbbmotors said:

Hi yes cylinder compressions when running are all over on all 5 cylinders all fluctuating. Under load garage said compressions should all even out. To be honest i was only watching the garage put the computer on so not sure what most of the values meant. Would the ckp faulty also cause the lack of power. Another thing is car struggles to rev over 2500 just feels completely flat.

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What does this mean?
cylinder compressions when running are all over on all 5 cylinders all fluctuating.

How could they test cylinder compressions of a running engine?
I don't think so! CRAPOLA !

CharlesY

Thought it was computer magic but could it have been cylinder balance. Like i said i was just watching bloke with computer. I'm not a computer analyst just someone with a ropey discovery.

Gbbmotors said:

Thought it was computer magic but could it have been cylinder balance. Like i said i was just watching bloke with computer. I'm not a computer analyst just someone with a ropey discovery.

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Good.
Getting places now.

I suggest you try to find a friendly LandyZoner who does TD5s.
Forget about dealers and garages - their FIRST priority is to part you from your money, whereas a friendly LandyZoner might do the job for a couple of pints. Chances are someone like Eightinavee knows more than the garages anyway - he sure helped me a while back when my TD5 did in its injector washers for the first time.

You problem needs a methodical approach, not just flinging bits at it (at your expense) till it is sorted - if it gets sorted.

What about it Boys?

Who can help Gbbmotors?

I think I am too far away.

CharlesY

Where abouts are you located Gbb ?

Hi shifty
I'm near grimsby so gonna try Td5 alive after xmas when i've got some money. Will hopefully post the answer shortly cheers

Well surely there can't be anyone on here as sad as me on boxing day happy xmas anyway if ur reading but!!! Well i have developed a new problem disco won't start at all now. No sound from fuel pump- checked fuses pump fuse blown- changed no difference checked feed to pump yes theres a feed so genuine fuel pump knackered after 6 months. Suspect pump blown as its having to work too hard to overcome partial blockage somewhere. Pump was not noisey before failing. Wonder if this underlying problem is the cause for my lack of power. Any ideas.
Charlesy any ideas !!!!

Gbbmotors said:

Well surely there can't be anyone on here as sad as me on boxing day happy xmas anyway if ur reading but!!! Well i have developed a new problem disco won't start at all now. No sound from fuel pump- checked fuses pump fuse blown- changed no difference checked feed to pump yes theres a feed so genuine fuel pump knackered after 6 months. Suspect pump blown as its having to work too hard to overcome partial blockage somewhere. Pump was not noisey before failing. Wonder if this underlying problem is the cause for my lack of power. Any ideas.
Charlesy any ideas !!!!

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Does it have a clean new fuel filter?
If there is a water drain on the bottom of the filter, drain it.
If nothing comes out, assume it is frozen solid.

The pump may not be knackered - it might be frozen, and a stalled pump WILL blow the fuse.

I wish I could help more ... but at 500 miles it isn't easy.:scratching_chin:

CharlesY

wot yu doing this arvo, CharlesY?

The Mad Hat Man said:

wot yu doing this arvo, CharlesY?

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As little as possible, staying indoors, stoking the Bosky with wood and coal, and in the evenings nip out every so often to see if I can bag a fox. Two so far this week. It's too cold to sit out for any length of time at minus 12°C.

What about Gbbmotors 's Disco? Any ideas?

CharlesY

If you are near Grimsby, you could see if Alive Tuning have any ideas. Give them a call and see if Jim is around.