Vehicle & Technical > Defender

Ok, I'm stumped. Ideas?...

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bigfatsi:
Hi everyone, it's great to see you all back!

Now, a question...

Recently I put my 90 (200tdi) back on the road after a couple of months on the drive. Everything was fine for a bit, but now it's not!

I suppose I'd better start with what I did, that could have created the problem. It'll be my fault somewhere...

Firstly, I put in too much vegetable oil. I've ran it on SVO dozens of times, but put too much in at home before topping up with diesel to thin it out a bit. Result was a knackered lift pump (duly replaced).

This seemed to sort things out for a bit and I was away. Next I changed the fuel settings back to nearly normal (200tdi tweak) settings to increase mpg at a loss of power. Again, things were fine but a bit sllllooooowww. Then it developed a bit of a rough/misfire patch. I replaced the fuel filter and reset the fuelling at mid-level which seemed to cure it.

Now, however, it has started to run like a pig. Symptoms are 1. Lack of power. Total. 30mph max. 2. Misfire only at high revs. If I floor it, it'll go the redline and start coughing and blowing white smoke. 3. When you come off the throttle it acts as though it has been starved of fuel and coughs a bit as if the filter is filling up again.

It was suggested that I'd likely fouled up an injector, but I've changed them for a spare set with the exact same results. :(

So could we have a differential diagnosis? I'll put my thinking on the table:

1. Wrong fuel lift pump. Definitely looks different, however it seems to be working
2. Leak in fuel lines somewhere (although I don't know where - I've tightened and checked as best I can)
3. Knackered Injector pump  :cry:
4. Unseated fuel filter allowing air in
5. Head gasket

Any other suggestions or comments? Please?!

TIA

Simon

V8burble:
head gasket

barmiebrumie:
sedimentor thingy ?, I had the same on the disco I just bought as previous owner had tried to run it on neet veg via a heater, took all that out & then checked the sedimenter (under o/s/r arch on disco) by passed it by cutting the feul line & putting a new piece in, also changed fuel filter & blew the fuel lines through with high pressure air line. cured it straight away

Hope this helps


John

bigfatsi:
Thanks V8 and Barmie.

Mine doesn't have a sedimenter but I guess it could be an air leak in the system somewhere.

Head gasket seems likely, however I should add that after running with my foot down for a bit, it seems to struggle to idle as if it was starved of fuel. I had similiar symptoms when the fuel lift pump went - the tickover would be low after acceleration and gradually pick up as the fuel returned - almost as if the fuel filter had been emptied and was refilling. Could this be as simple as an air leak on the fuel filter or a pump with low flow?

Simon

bigfatsi:
Latest update:

Last night I changed the fuel filter and it has made a marked improvement. Power is up but there is still a misfire right at the top of the rev range - Full boost. Surely, if it were the head, there'd be problems at all revs including tickover? Smoke is only when the engine is misfiring and the engine surges as if it were low on fuel and ends up kangarooing.

I'll check the little turbo pipe across from the turbo tonight in case that has a hole in. Any other suggestions?

S

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