My 940se 2ltr turbo has started using a lot of fuel. It used half a tank on 120 mile run the other day which was all motorway, so i have no reason to drive heavy. When coasting it was ok , but when i put the power down to overtake at around 70/75 it took forever to build up speed and there was a lot of black smoke behind the car. I have heard a little noise from the exhaust which i will get checked but i don`t know what else it can be.The car has done around 125k and has no problems starting . Any HELP will be most appreciated. Many thanks
You may have bad bearings in the turbo, explains the smoke from the oil leaking into the exauhst and the air would be leaking ALL over the place, take off the air line pointing toward rhe front of the car and reach in, you'll feel the impailer, see if it has some play in it, it shouldn't move AT ALL
It could be a lot of things, but (in general, not specific to this car) it sounds like a 'turbo' problem/turbo air leak. Can you also hear a high pitched whining sound, or something sounding like an high pressured air escaping? Check under the hood for hoses that may have worn through or become disconnected because of busted O-clamps.
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assuning there is nothing major wrong, get some forte injector and use it as recommended. I once had a renault laguna diesel fail an MOT test, a roadworthiness test that is, on emissions...it was absolutely chucking out black smoke but the engine ran well. I put 2 bottles of injector cleaner in the half full tank and went out for an eighty mile drive revving the engine in the lower gears. I returned to the testing station an hour and a half later and the engine was running perfectly.
Alternatively, assuming the engine runs well but is just a little smokey, have it terracleaned, this will remove most of the carbon deposits from the engine/exhaust and should increase the life of your engine simultaneously improving fuel economy
the cause of the heavy black smoke is un-burnt fuel. is from excessive fuel pressure, faulty injectors,ignition timing out. If it is a turbo operation then the turbo is not producing the correct boost for the fuel settings . Check turbo for vane actuation . low power comes from overfuelling, low air flow. run the fault codes to see which sensors are out of parameter.
Diesel engines smoke when under a heavy load. Unlike a gas engines, a diesel engine uses fuel that is more like an oil.Smoking is a good indication the fuel is not completly burning because of loaded engine spee. White smoke indicates the fuel is not ignitingefficiently. Truck, boats, tanks abd anything else using diesel fuel will smoke when it gets more fuel than it can use.. Easing up on the throttle will lessen the smoke but not eliminate.. Of coarse if the demand is lessened by applying less loadyhe fuel consumption drops.Not to worry as long as the smoke doesn't attract the EPA.
This seems to be a symptom of a blown head gasket.
White exhaust smoke is an indication of water / coolant in the exhaust. The car running sluggish and using lots of fuel can be caused by compression loss.
Look at the coolant level color and smell (with cold engine - don't open the high pressure reservoir with engine hot as hot coolant may spray you in the face). If you have a blown gasket, the coolant color may become brownish and it may smell bad or the level will get lower even if you have just refilled the cooling system.
What you can also check for is bubbles in the reservoir. With engine cold, remove the reservoir cap. Start the engine. Try to rev the engine (or have someone do it) and observe if there are bubbles in the reservoir tank. If you see lots of bubbles, you have a blown gasket.
sounds about right for what i think it is ,now remove the EGR valve and make a gasket from a coca cola can and do not cut the middle out ,so it blocks it off completely then try it as i am almost positive this is your problem .
The turbo will not cause black smoke. White smoke, yes, if its passing oil into the engine, but not black.
First check that the air intake and filter is not blocked, check that the air hoses from the turbo and intercooler are not collapsing when given throttle.if thats ok, then get the injectors tested, if they are ok then you need to get the injection pump serviced. Black smoke is a result of overfuelling, either by the poor dispersal of fuel from the injectors or the pump, or blockage of air into the engine on the intake system.
Hope that helps