Xantia diesel turbo/ecu problem?

1.9 TD Xantia 1996 ish. What's happening is that if I accelerate gently all is OK, if I put my foot down (not necessarily very hard) the car splutters like it's flooding until the revs reach 3k and black smoke issues forth, the once 3k revs are reached it takes of like a scalded cat.

I did have a similar problem 3 years ago when I bought it and this may have been due to a wastegate or something similar. The only reason I wonder whether it is that, is because in my quest to find why the aircon stopped working yesterday, I pulled the fuse to the ECU because it also goes to the A/C cut off relay.

Reply to
Malc
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Sounds more like diesel problem rather than electrics.

JOhn

Reply to
John

True, the HBOL says injector problems. But it came on very suddenly, i.e. yesterday it was fine and this morning it wasn't so I was wondering if the ECU had a master reset type thingy.

Reply to
Malc

Sticky injectors, you can get them checked at a diesel specialists.

Reply to
Duncanwood

The ECU only controls pump timing and EGR.

For some reason it sounds like it is massivly overfuelling at low revs, but without looking at the actual vehicle its virtually impossible to say for definate.

However a *very* good starting point (sarcasm) would be to re-instate the fuse and see if it is then back to normal!

Tim..

Reply to
Tim..

I might be daft but I'm not that stupid. The fuse was pulled, examined and replaced.

Reply to
Malc

When you say replaced, do you mean replaced with a new one (i.e. it was previously blown), or just the old one (with nothing wrong with it) put back in? If replaced with a new one due to the original being blown, it's entirely feasible that the same fault that caused the old fuse to blow could have blown the new one.

Reply to
AstraVanMan

It wasn't blown nor did I expect it to be. It was just one other thing to check when the air con didn't work. Lets not go down this route, I pulled the fuse because it powered the aircon cutout relay as well as the ECU. All I wanted to know was whether this could cause the ECU to reset to a "get you home" setting.

Reply to
Malc

Malc ( snipped-for-privacy@ubht.swest.nhs.uk) gurgled happily, sounding much like they were saying :

Does it even have an ECU? Earlier Xant Ds didn't, and I think that was around the change-over era.

Does it have the keypad immobiliser?

Reply to
Adrian

There's a circuit board in a plastic box just behind the driver's side headlight.

Yes

Reply to
Malc

Malc ( snipped-for-privacy@ubht.swest.nhs.uk) gurgled happily, sounding much like they were saying :

Furry muff. Definitely after the point where the lump gained an ECU, then.

But, no, I can't see that the default settings (I don't think it's a "learning" ECU, anyway) would cause the problems you're having. I think it's more fundamental.

Reply to
Adrian

Ok thanks. It's booked in to the garage on Thursday unless I can crack the problem before then.

Reply to
Malc

ECU on an XUD9 engine - you've got to be joking. It's an old tech indirect injection engine using either a Bosch or Girling mechanical diesel pump.

If you are talking about a 2.0 HDi then that's a different matter.

/John

Reply to
John Kenyon

Tis true, well sorta, the later immobilzier equiped XUDT's had a unit on the pump and another which controls the immobilizer and also the pump timing and EGR.

Its solid state, and more a logic controller rather than a computer that responds to sensors and calculates something.

Tim..

Reply to
Tim..

Tell us what cured when you fix it.

Reply to
Duncanwood

John Kenyon ( snipped-for-privacy@gmx.net) gurgled happily, sounding much like they were saying :

Wrong... It's certainly an old tech indirect injection lump, but later ones did indeed use an electronic pump with ECU.

Reply to
Adrian

The owners manual shows a fuse marked ECU and there is a PCB behind the headlight which sort of looks big enough to be that kind of thing. But the owners manual does cover a few varieties of the car.

At least the fuse descriptins in the owner's manual seem to agree with reality, the HBoL fuse descriptions don't tally at all. No how, no way.

Reply to
Malc

The 2.0l HDi engine had common rail. The 1.9l XUD9 had/has a mechanical pump.

/John

Reply to
John Kenyon

John Kenyon ( snipped-for-privacy@gmx.net) gurgled happily, sounding much like they were saying :

Yes.

Earlier ones did. Later ones had an electronic pump. How do you think the keypad immobiliser works on later 1.9D/TD Xants/ZXs/etc?

Clue : Not on the ignition circuit.

Reply to
Adrian

Anyway see my post up there ^

The EGR valve is being held open by something electrical which is driven by the ECU

Reply to
Malc

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