iCarSoft won't work on a TD5, don't waste $s(or thoughts) on one(unless you have any other OBDII capable vehicles you may want to diagnose).
I think the other option is a Hawkeye diagnostic thing. I've read some folks use them, but don't know anything about them myself.
If you've had injector seals done(as well as CPS) and Bruce Davis has a reputable following, it's unlikely then that they are the causes. Not impossible to take out of the equation, just very unlikely to be.
Another possible cause could be FPR(fuel pressure regulator), and you could do a cheaper rebuild option(strip and replace regulator) or you could just get an entire assembly to replace. But this is just guesswork.
So is your issue persistent? .. in that it will only run for about 15mins every time .. or just that on some drives it will do this, but then other times it runs ok?
When we were troubleshooting the brothers D2, it was a 'always on' issue .. in that the car would only drive for about 10-15mins or so .. ie. pretty much unusable.
I haven't checked the temp of the fuel filter myself, but when we replaced the fuel pump(incorrect guess at the injector seal issue), I do remember that the half a tank of diesel was very warm. Note that the fuel going to the injectors does funnel it's way through the actual head(in via the FPR, out from the front via a return pipe) .. and it's under pressure by both the fuel pump, and each injector .. AND it also gets some heat transfer from the coolant too via the fuel cooler too.
So it would be expected that the fuel filter should be warm(just that I've never thought to check it).
One other question: if you drive for a shorter duration, that is switch it off before it dies, does it then run for about 15 mins again, or will it only drive for a short period?
When I finally gave in and began taking it to a LR expert to solve the mystery, I was driving at a reduced speed to normal(eg. instead of 80 in a 80 zone, I was just pootling at 60), then the TD5 started to die a bit more slowly than it usually did.
Spur of the moment choice, I vigorously pumped the accelerator as it was dying. In the old days I had a old beetle that had a vapour locking fuel pump, and to keep it going while it died, I did this, and it kept going.
It was more of a reaction, then a premeditated thought.
Anyhow , it kind of came good, just with much reduced power at the time and billowing out smoke(from the exhaust). but it kept going. I stopped it due to the smoke level(totally inconsiderate).
So I turned around and headed back home. Later that night, I tried the same thing, but it was hit and miss if it worked. I tried at many speeds trying to replicate the exact situation, but nothing. it helped sometimes, but other times not.
The, same day, I got back onto the forum and noted a few replies, re the injector seals.
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