C5X7 2.0 hdi auto just stalled twice. No clue

[wurlycorner]

A proper pain to try and track this one down by the looks. Could be something getting heat soaked?
I think probably only monitoring live data during a run and seeing what drops first when it goes to stall, is likely to be the only way to track it down?

[aerodynamica]

It's very intermittent. Gave the wires at the crank sensor a wriggle. And the cam sensor plug, same at everything under the big fuse box cover, everything at the intake manifold.

Does anyone know if the hdi 2.0 has a fuel pump in the diesel tank?

I noticed that is a lot of black cr*p in the intake manifold.

[aerodynamica]

A proper pain to try and track this one down by the looks. Could be something getting heat soaked?
I think probably only monitoring live data during a run and seeing what drops first when it goes to stall, is likely to be the only way to track it down?

Yea it's just a pain. I do wonder about the heat thing. I have had it idling for an hour after driving to the shops (1mile) initially bust traffic and it was fine. Engine cut exiting sainsbury off throttle. Started and was fine rest of way. Hour of idle then I rolled it back down the drive, slight down hill, and forwards onto the garage and got ramps ready to drive up and see if incline affected it. That's when it stalled again. Before the ramps. The engine knocks and actually seems to raise revs before it cuts out.

So, no idea still. The live data thing might be possible on laptop with lexia.

[aerodynamica]

I recall a tale of a diesel xantia that had like mould in the fuel tank that clogged the pick up and caused it to cut. Only sign was the priming bulb vacuumed flat. But if there's an electric pump in the tank that would not cause the priming bulb on this to go flat. Fuel line to the filter housing is full of fuel, no bubbles or anything.

I do wonder how good the sealing at the pipe inlet and out of the filter housing are. They are kind of loose fit.

[MattBLancs]

Does anyone know if the hdi 2.0 has a fuel pump in the diesel tank?

I noticed that is a lot of black cr*p in the intake manifold.

Have you a priming bulb under the bonnet? If so, no in tank pump.
2.2 HDi doesn't (but does feed 12 volts to redundant terminals on top of the tank!)

[MattBLancs]

I'd a small amount of "coffee grounds" = diesel bug in the tank. Not enough for the squashed flat priming bulb issue though.

Talked about here:
viewtopic.php?p=721946&hilit=Coffee+grounds#p721946

Was sure there was a picture, not coming up for me now searching

Edit: found the images:
viewtopic.php?p=721454#p721454

[aerodynamica]

Does anyone know if the hdi 2.0 has a fuel pump in the diesel tank?

I noticed that is a lot of black cr*p in the intake manifold.

Have you a priming bulb under the bonnet? If so, no in tank pump.
2.2 HDi doesn't (but does feed 12 volts to redundant terminals on top of the tank!)

Hi Matt, yes there's a priming bulb, it's 2.0 RHR. I think the fuel pump is at the end of the camshaft.

Just ran another diagnostic and it has fault codes:

P0243
P1471
P0409

All to do with egr and turbo solenoid etc

[aerodynamica]

Anyone happen to know where the turbo pressure solenoid is located?

And it the wastegate solenoid actually mounted on the turbo itself? I suppose it will be. I did see a picture of one that looked like it would fit there.

[aerodynamica]

I think I found this. Next to the alternator and for once, something easy to reach... so probably nothing wrong with it

Car drove today without stalling. I gave it a few Italian tune ups on the way in at 6am. Cleared the faults log at work. It was much warmer returning this afternoon and although no stalling, the throttle response is poor. Delayed and not exactly punchy. Checked the faults log getting home and there were faults for the turbo pressure solenoid again, throttle pressure. Same ones as before I cleared it. Kms of when they occurred matches the journey home, actually just leaving the motorway to be more accurate. I wondered what the state of the throttle body was like. It's up stream of the egr pipe inlet but downstream of the turbo and intercooler and wondered if the intake was going to be gummed up with grot.

Anyway, the amount of black horror stuff at the end of the egr valve thing was a hint because it was thick with ink black gunge. So the least i can do is clean the throttle body, the butterfly and the 2 sensors( I think inlet temp and pressure) they were all black coated.
Before

After

Can actually see the air temp sensor now. No idea if this will help that much but it wasn't too much of a challenge to clean. Although it's used up all my electrical contact cleaner.. also cleaned the reachable part in the intake manifold and vacuumed it out but I plan to remove the manifold to clean once the new gasket set arrives.

But early indication is good, started and ran smoothly and although I didn't go on a test drive, going up the drive way was enough to show the throttle response was better. Unless it was my imagination.

Anyway tomorrow morning is the test drive

[myglaren]

Excellent photo!

[aerodynamica]

Ha thanks, I couldn't believe how grotty it was

[aerodynamica]

It drove surprisingly well this morning. Don't want to jinx it and assume its fixed though

[wurlycorner]

That was indeed very grotty - as you say, difficult to imagine how that temp sensor could be working correctly, when covered in that much crap!
makes me think I may go and check those on mine...

[MattBLancs]

. Although it's used up all my electrical contact cleaner..

White spirit and old toothbrushes surprisingly effectively at that type of muck. Old socks / rags to wipe down.

Probably keep the white spirit off the temperature sensor (think unscrews from the "throttle body" housing?) but otherwise works pretty well. Won't melt the plastic either

[aerodynamica]

That was indeed very grotty - as you say, difficult to imagine how that temp sensor could be working correctly, when covered in that much crap!
makes me think I may go and check those on mine...

You should. So far still good. Can't imagine it's all down to this though.