Hi all,
I've just joined the LZ and Im glad I have, especially on this thread!
I'm going through exactly the same things as everone else here has regarding this "air in the system" BS, and it's been driving me nuts and seesm to be atempting to remove all of the money from my bank account and make me homeless
It all started really suddenly when the old girl took more that a second to start one day, then just kept getting harder.
To date I've had one qualified mech. who didn't even know how to get to the fuel pump to replace it, after I'd told him not to try the job unless he knew what he was doing.
It wasn't until I saw the arse end of the wagon on the ground beneath the hoist with the tow bar etc all taken off that I knew he didn't know, but several hundred bucks later!
At that stage the return line from the diesel cooler had been taken off and the diesel was aerated, so the pump was replaced and the diesel checked in the same way, and all clear and started first time, but not 2 hours later.
Since then, and with no leaking diesel (externally obvious) and having never had the injectors out I presumed that it was possibly the filter housing or FPR, so I've replaced them both.
Starts fine after the purge but a few hours later, no way in hell will it start without the purge process.
Had it tested at the local LR dealership and there were electrical shorts showing on some injectors and the injector wiring loom had oil in it.
Changed the loom, cleared the shorts and started fine, but not 2 hours later
So have now changed the pump, filter, FPR, wiring harness and arguablly it's worse, certainly no better. Just had another diagnostic check and there are no electrical issues any more, so we're thinking about the possibility of the injectors themselves remaining partially open and allowing fuel to drain to the cylinder head???
Is this really a possibility and worthy of a couple of hours of checking??
I'm interested in the non-return valve and the air bleed valve in this thread.
I'm no mechanic, but not stupid either and after the vehicle has sat for a while somehow it seems that fuel has drained away from the rail as the pump has to cycle for about 40 seconds when the ignition is on.
After that it might, and I SAY might just start after 20 seconds of cranking with the accelarator fully depressed, otherwise it's the full purge cycle 5 or 6 times, every time, and sometimes even needed twice.
Twice now over the past 8 weeks it's even stalled out completely while running, even with the new parts, but if I go through the purge cycle it'll start again.
When it's running it runs great, 1/2 or full tank, even at max throttle, it's just getting it started with that fuel loss from the rail.
You can even hear it when it cranks over (if you've ever heard that empty, lack of compression noise when you've run out of fuel).
My dealership are trying to help to be fair, but everyone seems stumped?
I have to say that what I find disgusting is that LR as the company take no part in this forum or via the helplines, they just say take it to your dealer!
It's obvious that they must be aware of this issue, and there is bound to be a common theme here between all the vehicles, they can't all be that randomly different witht the same symptoms, and I'm gutted they don't help directly from an H/O level.
So unless anyone has any other suggestions I'm going to replave the injector washers and the get the fuel filter non-return valve and air bleed valve checked.
Do you think for the hell of it I get the injectors checked to see if they are leaking internally as well??
LR if you think you're helping retain customers by ignoring this you're very wrong.
Jeremy Clarkson might think you're good, but he doesn't have anything ever either he's paid for or gets out of manufacturers warranty.
I got rid of my R/R because of this sort of BS, surely you're not going to drive me away from the Discovery as well?
I look forward to any other help and I'll just keep looking:monitor_punch: