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Black smoke at 50mph


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Just seen a relative at the weekend who has an M reg 300tdi Manual ES Discovery.

He's been having a problem with loss of power and black smoke at about 50mph. Last time I saw him I recommended changing the lift pump as it was cheap and easy to do, he's one that and general power has improved but he is still having problems around 50mph.

He's changed fuel filter, oil + oil filter, air filter etc but no improvement.

Basically he tows a caravan quite a bit with it so he spends a lot of time at 50, below 50 it seems fine but at 50 and above it suddenly backs off a little on the power and a big cloud of black smoke comes out the exhaust enough to make it very difficult to see out the rear window, load doesn't see to make a difference and it does it whilst going up hill, down hill on the straight, accelerating, cruising or decelerating.

He's taken it to a local mechanic who says it's the FIP which is worn, and recommends having the FIP reconditioned, I think the price quoted was around £700 which included changing the cambelt.

I thought that was quite a lot considering he also needs a few other bits doing - a small amount of welding (the normal bits are all sound though) new front shocks, and two new tyres.

The only other thing I can think of was he said a local LR specialist had "tweaked" it a few years ago, to slightly reduce top end speed, but to increase torque for towing the caravan. This was done and seemed to have the desired effect and had no ill effects for 3 years so he doesn't think it's related but I thought it could be related?

Any suggestions to try before the FIP?

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Perhaps whip the injectors out and get them tested by a diesel specialist. IIRC they are 'two-stage' and most garages won't have the ability to test them properly but it should only cost about £20. Replacements are cheap enough (well, compared to a new IP!) and may solve the problem.

Good luck,

John

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If the EGR has jammed open, then the inlet manifold will start to get coated with marmite. This has the effect of restricting airflow into the engine, which would make it gutless/smoke. It would have to be quite bad to has the effect you describe though.

Intercooler is a good suggestion.

Les.

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If the EGR has jammed open, then the inlet manifold will start to get coated with marmite. This has the effect of restricting airflow into the engine, which would make it gutless/smoke. It would have to be quite bad to has the effect you describe though.

Intercooler is a good suggestion.

Les.

i had the same prob just the other week scrap the erg use a 200 tdi intrcooler top hose and a blanking plate all my power came back less smoke and as an added bonus i seem to get more mpg

regards mark

this is the link to pics

http://forums.lr4x4.com/index.php?showtopic=29247

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