My 2004 S Type diesel sport, automatic on occasions, emiots black smoke from the nearside exhaust, accompanied by a lag in acceleration. What is the cause, and how much will it cost to remedy?...Mike Jones
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This is normal. Look under the front nearside and you'll see a 3 inch diameter hole out of which the smoke is coming - This is designed to vent the fumes from a diesel 'pre-warmer' which obviously, on cold days, springs into action. It looks awful, but, so I'm told by Jaguar, is the way it's meant to be. I'm only passing on the info I got when I enquired about exactly the same thing so this isn't necessarily the complete answer and you may have other more serious issues, but it put my mind at rest when I was told this.
Just an idea but the Ford Mondeo ( european car ) from which I believe your engine is
taken has a habit of splitting a low pressure tube at the back of
the engine this is a relatively cheap,
easy fix. The other symptom this used to throw up was a little more
black smoke from the exhaust and a pacing/ surging from the engine.
i had this problem and thought the fuel filter oil filter needed replacing so i have just had a service done but problem is still there but not as bad. been told it could be the AGR valve or a split pipe going to it which recuirculates unused fuel back to burn again. therefore unspent fuel is coming out of the exhaust causing the black smoke. i am still looking for the answer aswell, hope this helps.
This could be as simple as the EGR (exhaust gas recycling) valve stuck open. This valve is supposed to open at a specific time, recycling the exhaust gasses back through the engine. If they stick open, the engine is not getting the correct air mixture to burn the fuel efficently, causing black smoke and lack of power. Have the garage remove and blank off this valve. If it runs ok, then a new EGR is needed.
This is almost certainly a split hose - mine was the large hose coming out of the bottom of the EGR valve. Speaking to a parts guy at my local Jaguar dealer, he said that the new part is uprated as Jaguar are aware that this is a problem. The split allows more air in and results in the ECU changing the mixture and over fuelling - Black smoke is an indication of un-burnt Diesel. As well as the black smoke you may also notice a whistle/whine or sucking noise when you accelerate and a lack of power / lumpiness at around 2000rpm.
Black smoke usually means a fuel problem, try changing the fuel filter
and get an injector cleaner from tesco's or asda they're about £3 to£5,
if your gonna change your fuel filter you might as well change the oil
and filter and the air filter at the same time