Vehicle & Technical > Defender

TD5 Glitch

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drum:
Since the defender was serviced, I've had a small glitch a couple of times, anybody any idea what it is?

If I drive hard and underload, say maintain 70+ on the motorway (not that I would you understand :D ), for maybe half an hour. I get a sudden loss of power, it feels like it's jumped out of gear, but without the sudden high revs. Before I've had time to react, everything is back to normal. The only thing I have time to notice, is that the temprature guage, goes off the scale, but only for a second.

It's done it to me maybe 4 or 5 times now. If I just pootle along it never does it.

My gut feeling is electrical, but obiously in a TD5 That's a fairly decent bet, anybody come accorss it before??

scooby:
Hi it might be a slight heat sizceron the truck but i will look into it to find out more for you. never come across it b4, but i now you could get the same problem on a motorbike. Which was down to heat sizcer. It might be a fuel problem, If it clears in sec" the best thing to do is wight intill it gat worse earse to work out then. Or pay out for it to go on a flault finder which will coast loads and they still will not know.

drum:
I would have thought it was nigh on impossible for the temprature to go up that suddenly and straight back down. Probably takes 2 secs, to go from mid way, to off scale, and back again. Which is what made me think it was electrical.

My first reaction was dirt in the fuel, bunging an injector or something, causing a misfire, but then getting pulled through by the momentum of the running engine\speed. But why would it only happen under heavy load, and why would the temp guage, fly up when it happens?

scooby:
As you say you could have a bloke in the fuel but the over heating not sure. Never come cross this b4. norm is block thermosat for over heating etc, and lack of power would be fuel or pump giving up or crap in tghe fuel but the same at the sametime not sure inless you have two things wrong with the truck. and they come up at once.

drum:
Is it possible that the TD5 cuts the fuel\power if it senses an overheat??

If so I diagnoise a faulty temp sensor\loose connection. Giving a dodgy temp reading for a fraction of a second. Result - ECU Cuts power. Then Sensor returns to normal, and normal service resumes.

What do you reckon?

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