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Black Smoke Under Load. Minimal Surge Up Hills


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#1 Neilou

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Posted 24 September 2019 - 10:12 AM

I have a 2009 1.8 Focus 115 tdci. No problems prior to recent Mot 4 weeks ago. Failed emissions but passed after service. Apparently a lot of revving and additive to engine oil helped. Since then strong smell of fuel on driving. Garage discovered one of the injectors loose, they tightened which solved the issue. A few days later there was a strong smell of fuel again from another area which has been tightened, so ok now. Unfortunately black smoke on high revs also slight delay when applying accelerator up hill, so slight surge. Doesn’t seem to happen on the flat. Am a little miffed as the car was fine up until 4 weeks ago. Would appreciate any ideas.


#2 E TEA 66

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Posted 24 September 2019 - 02:29 PM

I don't really know much at all about modern diesels sorry and the main issue these days seems to be regarding the egr being badly coked up choking the engine  causing hesitation but hopefully it won't be too long before an experienced diesel car owner offers better advice .

#3 Neilou

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Posted 27 September 2019 - 11:16 AM

We have read on the forum to use bg244 diesel fuel injector and engine cleaner before inserting an EGR blank to improve performance. We are apprehensive re using this additive as the garage said they would put an additive in when they serviced it on the 16th of September. The additive does not show up on their invoice and they don’t remember if they did or not. Can any harm be done if we use the above additive regardless. We have put in approximately 80 litres of fuel since the service. Could anyone advise if it is ok to do so. Thanks.

#4 E TEA 66

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Posted 27 September 2019 - 02:01 PM

Well if you have put 80litres of fuel in the tank since the service then their should not be any trace of the additive left in the tank which should hold 55litres so should be quite safe and seen as any business man doesn't like loosing any chance of profit and the additive wasn't on the invoice I very much doubt it was put in the tank  in the first place .

#5 Neilou

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Posted 27 September 2019 - 08:41 PM

. Thanks.

#6 miketmechanic

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Posted 10 October 2019 - 09:07 AM

Using diesel injector cleaner is a very important part of your running of your car as it keeps it in peak performance and the emissions to the levels you need but it doesn't fix black smoke. Black smoke means the engine is being over fulled.

That doesn't mean that there is too much fuel being put into the engine (although this could be the case) I could be that not enough air is getting into the engine which means it is being over fuelled.

Check your air filter, for starters, check to see there is nothing obstructing the inlet in your air filter box or anywhere there is an opportunity to cause a blockage into the engine.

Another thought is check the DPF or diesel cat as it may be blocked which will make the engine not rev very well if at all.

Hope this helps a little