Engine problems.

[obdtech]

Any update on this?
Got me thinking too.
Black smoke is hydrocarbons......i.e. incomplete combustion.

My questions and thoughts are........did it actually rev like hell?
if the turbo oil fed the engine you are unlikely to be able to switch it off, so i don't think its that(from what info we have been given)
The black smoke can only come from post combustion (out the engine).....so......it must be black soot from the turbo or exhaust 'system' that you witnessed?
I just purchased a MK2 DV6 that 'sounded like a tractor' (seller said) had black smoke and loud exhaust blow noise.......i found that the EGR valve (yes its part of the exhaust system!) lower core plug had run away(round back of engine so you cant see it without a strip out)........i'm thinking you have the same problem if it made hell of a noise and black smoke suddenly from under the bonnet.

Hope this helps

[sean1]

I am finally able to update you all regarding the problems I had before Christmas. Apologies for the delay.

The car has been unused since my first post. At that time it was suspected to have a faulty high pressure fuel pump or turbo (not uncommon apparently). In the meantime I had done a bit more research and had spoken to Citroen to find out what the unspecified 'problems' were which could be caused by overfilling the fuel tank, as noted almost inconsequentially in the handbook. I wanted to check this out before taking the car to be fixed and possibly misdiagnosed- Initially Citroens technicians all suggested the turbo was at fault, but this didn't ring true, given the circumstances.

Strangely I managed to get the car started briefly last week, although it ran very rough. It was apparent that smoke/ pressurised fuel was leaking from around the fuel rail at the back of the engine.

I had the car taken to the citroen dealer I use, who found two tiny holes in fuel pipes adjacent to the fuel rail. They replaced these along with the air filter and two egr clamps. They said this should sort things out.

Unfortunately, having done this work, they called to say that the car has suspected engine damage as it's running rough and it has loads of fuel in the induction system, so they are now going to do a compression test, but they seem to expect major work.

Citroen head office have now finally informed me after I insisted upon getting an answer from their technical people rather than being put through to various dealers, all of whom said that no problems can possibly result from overfilling the tank, that this can lead to fuel leakage, however they were unable to elaborate.

I cannot believe that a car of less that five years old with only 61k miles should need such major work done, least of all, as I suspect, simply because the fuel tank was overfilled.

[ron]

I wonder why Citroen didn't engineer a overfill prevention if it's such an issue.Methinks a cover up is more likely.Not that I'm cynical.cratch:

[pch]

I was driving a disability car, n reg Renault when it suddenly started to rev up , took ignition key out and carried on revving, chlouds of black smoke. Eventually died and replacement engine was needed. SCARY, I walked away from car thinking it might blow up......then driving my partners freelander along the A55 at 60 it coughed a few times and belched smoke out. Continued to drive for 20 minutes and suddenly chloiuds of black smoke bellowed out. By the time I stopped it slowly died.....then after breakdown recovery Turbo had disintegrated and bits went into engine. Massive repair bill, engine sent to Manchester where it was exchanged for rebuilt one, that was wrong, so our engine rebuilt, they didn't close off all holes when steam washing it, fuel pump knackered.....eventually 3k later and 6 months it was running. I had to get Barclaycard legal department involved ...and we sold it very soon after. Any black smoke is deadly, don't hesitate to get it sorted. and I agree with other comments ...change that oil frequently......forget 12k servicing, its all a marketing ploy....

[jonb]

Sorry to hear you still have problems Sean , very annoying.

Maybe going back to basics is the key , timing and compression check then move on.

The dealer SHOULD be able to diagnose the problem more clearly than this , a compression test is simple and conclusive , in the old days we did "dry" then "wet" (wet being oil poured into the bores to highlight ring / bore wear) , wet tests are tricky these days due to piston head shapes.

In my opinion they should clean the induction system then test, it just seems the "easiest" option is to throw in a new engine and throw you a large bill..........

Jon

[sean1]

Further update,
the dealer now thinks that the overfilling of the fuel tank did not cause the problems I have experienced. they think that the holed high pressure metal fuel line leading to one of the injectors is the cause of the diesel found in the induction system and the destructive over revving. we already know that this was where the fuel leakage and smoke was coming from.

They are going to carry out a compression test to see what engine damage has been caused. they say that it may be the case that a glow plug tip could break off when removed to allow the compression testing, which would require the removal of the head to recover it. Is this likely.

Also they suggest that the holed fuel line and the resultant engine damage would be classed as wear and tear by Citroen HQ. Surely this is a manufacturing fault.