W Reg 306 HDi DTurbo dies under load

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LennyK - 06 Oct 2008 17:14 GMT

HI,

When accelerating hard in any gear the car performs OK but suddenly, around
2500rpm, there is a sudden lack of any acceleration, increased rattling
noise from engine and black 'smoke' emitted from exhaust. If I then
disengage the clutch the car returns to tick-over and I am able again to
accelerate again gently with no noise or smoke. The problem repeats as soon
as I try to accelerate hard again.

The car has passed the MOT test today, including emissions, and wondered if
the symptoms might be caused by failed hydraulic tappet(s)?

Anybody experienced anything similar and what was the problem?

Cheers,
Lenny

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malc - 06 Oct 2008 21:23 GMT

> HI,
>
[quoted text clipped - 9 lines]
> tappet(s)?
> Anybody experienced anything similar and what was the problem?

I'm guessing a bit here but the umm...I've completely forgotten the name of
it....wastegate? Something to do with recirculating exhaust gasses. My
Xantia turbo diesel (1.9TD not HDi) did something similar but without the
rattling. Eventually my local garage disconnected the solenoid and all was
fine. I know it's an older and less sophisticated lump which is why I said I
was guessing.

Signature

Malc
R1100RS old and tatty

You laugh at me because I am different
I laugh at you because you are all the same

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LennyK - 10 Oct 2008 17:00 GMT

Thanks for the reply Malc,

I tried disconnecting my EGR valve but the problem still exists.

Can you remember if your problem was the EGR (exhaust gas recirculation)
valve, which is opened by a solenoid to recirculate a bit of the exhaust
gases back to the inlet manifold?
Or, was it the wastegate, which I believe routes exhaust gas either through
the turbo or directly to the exhaust?

Cheers,
Lenny

>> HI,
>>
[quoted text clipped - 16 lines]
> fine. I know it's an older and less sophisticated lump which is why I said
> I was guessing.

Reply to this Message

malc - 10 Oct 2008 21:28 GMT

> Thanks for the reply Malc,
>
[quoted text clipped - 5 lines]
> Or, was it the wastegate, which I believe routes exhaust gas either
> through the turbo or directly to the exhaust?

EGR now that you jog my memory.

Signature

Malc
R1100RS old and tatty

You laugh at me because I am different
I laugh at you because you are all the same

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Johno - 07 Oct 2008 17:22 GMT

>HI,
>
[quoted text clipped - 12 lines]
>Cheers,
>Lenny

Hi I had similar problem on a 406 HDI ( Bosch system ) but without the
smoke , it was dying out at high revs , it turned out the fuel pump in
the tank has a very small filter on the base , the most stupid idea I've
ever seen , they that small they get full of rubbish and restrict the
flow to the high pressure pump, you have to strip the casing around the
pump to clean it , maybe worth checking
--

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LennyK - 27 Oct 2008 18:03 GMT

Don't know if anybody is interested but the problem came to a head last week
with dramatic effect - a cam follower had split along its length from tappet
to valve.

It appears that the rattle, under hard acceleration, was the cracked
follower giving way but when back to tick over the follower returned to
normal. Finally, the follower broke and the cam follower bearing fell apart
causing the obvious symptoms of a inoperative valve.

All 8 followers replaced, oil changed and now car performing as normal maybe
even better than before the problem arose (£300 garage bill).

Lenny

> HI,
>
[quoted text clipped - 12 lines]
> Cheers,
> Lenny

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baotiantanco - 30 Oct 2008 11:53 GMT

>Don't know if anybody is interested but the problem came to a head last week
>with dramatic effect - a cam follower had split along its length from tappet
[quoted text clipped - 15 lines]
>> Cheers,
>> Lenny

I would never have guessed anything to do with the head. Blimey, thats weird.
Thanks for posting this buddy.

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