sotal Posted August 4, 2008 Share Posted August 4, 2008 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? Quote Link to comment Share on other sites More sharing options...
JohnL Posted August 4, 2008 Share Posted August 4, 2008 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 Quote Link to comment Share on other sites More sharing options...
Les Henson Posted August 4, 2008 Share Posted August 4, 2008 Is the EGR still fitted? Is the inlet manifold clogged-up with Marmite? Les. Quote Link to comment Share on other sites More sharing options...
sotal Posted August 4, 2008 Author Share Posted August 4, 2008 I don't know on the EGR side of things, I think he said he'd had the injectors tested but I'll check that to make sure, anything else to suggest? Just out of interest would the EGR give those symptoms? Quote Link to comment Share on other sites More sharing options...
DaveSIIA Posted August 4, 2008 Share Posted August 4, 2008 Is the intercooler clean inside? - easy job to take off and flush out. Also, are all the turbo hoses intact, no splits, etc? Quote Link to comment Share on other sites More sharing options...
Richard Mills Posted August 4, 2008 Share Posted August 4, 2008 Hi There, a friend of mine had the circlip come off the wastegate of the turbo, caused a similar problem. But easier to check is that the inlet system is sound. Leaking pipes or the intercooler leaking can cause smoke. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted August 4, 2008 Share Posted August 4, 2008 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. Quote Link to comment Share on other sites More sharing options...
old leafer Posted August 4, 2008 Share Posted August 4, 2008 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 Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted August 5, 2008 Share Posted August 5, 2008 What's wrong with Marmite? Quote Link to comment Share on other sites More sharing options...
old leafer Posted August 5, 2008 Share Posted August 5, 2008 What's wrong with Marmite? everything Quote Link to comment Share on other sites More sharing options...
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