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  #1  
Old 23rd-March-2011, 16:52
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Default turn up the boost to cure black smoke?

Hi

My Defender 200tdi chucks out buckets of thick black smoke under acceleration or full load. Back off and it stops.

I've fiddled with the fuel screw on the pump before and have ended up with no power, or misfiring, or white smoke... I'm a bit loath to touch the pump again! Especially as everything is dusty here.

I wondered if it would burn more diesel and smoke less if I increase the boost? Apparently easy to do by screwing the wastegate rod in, and it might go a little faster ;-)

Or am I barking up the wrong tree?
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LZ
  #2  
Old 23rd-March-2011, 16:56
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Default Re: turn up the boost to cure black smoke?

Woof woof. I reckon its your fuel pump that needs correct adjustment. Have you given it a good service recently too?
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Old 23rd-March-2011, 17:02
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Default Re: turn up the boost to cure black smoke?

I'm sure you're right... It's got a new air cleaner, fuel filter etc. I've been told worn injectors might make it smoke.

We're a bit short of expertise here on adjusting pumps. New ones are expensive plus 100% duty, and if a vehicle runs no one worries about the smoke - part of the problem might be poor quality local diesel.

So I was just trying to think around the problem.
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Old 23rd-March-2011, 17:07
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Default Re: turn up the boost to cure black smoke?

If it runs well i'd leave the turbo well alone, thats big money to repair/buy. I think there's a guide here somewhere on how to clean/recon injectors. If its poor diesel it may well be that but a general and cheap clean/repair of your fuel system is a good place to start. I'll see if i can find that guide...
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Old 23rd-March-2011, 17:08
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Default Re: turn up the boost to cure black smoke?

You could always pop the top of the pump 4 screws and rotate the diaphragm clockwise for more fuel and anti clockwise for less, mark it first so you can return to standard setting if unhappy.
Takes two minutes.
If you google for pump adjustments you can find out exactly what does what on these pumps pretty simple.


Lynall
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Old 23rd-March-2011, 17:13
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Default Re: turn up the boost to cure black smoke?

Here you go..

howto: 200tdi injector refurb
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Old 23rd-March-2011, 17:21
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Default Re: turn up the boost to cure black smoke?

Funnily enough, 2nd hand turbos and new bearings etc aren't that expensive here. Yet another part of the problem is that the current turbo is a little small - I think it came off an old Renault!

I'm more worried about opening up the pump than anything... or blowing the head gasket.
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Old 23rd-March-2011, 17:28
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Default Re: turn up the boost to cure black smoke?

Your turbo (even if its the wrong one..eek) is going to have very little bearing on the black smoke as that is a fuel delivery issue.
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Old 23rd-March-2011, 17:37
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Default Re: turn up the boost to cure black smoke?

Well, you're right in that the problem is fuel, but...

Black smoke is overfueling.

If you increase boost, you need to increase fuelling to take full advantage.

My logic is that as it's already over fuelling, raising the boost and introducing more air should help it burn more of the excess fuel.

I know it will put the turbo and engine under more stress, but then overfueling can kill head gaskets on it's own (I think).
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Old 23rd-March-2011, 17:41
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Default Re: turn up the boost to cure black smoke?

But then you're just creating a situation where you're ignoring a problem by covering it up with another...if you're not careful you'll damage not only your turbo but your entire fuel system. Surely its best to leave the well functioning turbo alone and look at the reason for the unburnt/overfuelling?
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