If you're seeing blue smoke from a turbocharged car, then another reason for it could be a worn-out turbocharger. This will need rebuilding or replacing, which is also an expensive job. Like blue smoke, grey smoke could be a sign of excess oil burning somewhere in the engine, or a turbo needing attention, but there are other causes.
One might be a faulty PCV valve. PCV stands for Positive Crankcase Ventilation, and this device is one of the most basic forms of emissions control, as it draws unburnt fuel back from the lower part of the engine to the top.
This helps reduce vehicle emissions, especially when the engine is cold, but over time it can wear out. Smoke caused by PCV failure will look serious, but PCV repair is a relatively straightforward job when compared to some of the other causes on this list.
If you drive a car with an automatic gearbox , then another reason for grey smoke might be that transmission fluid is being drawn into the engine through a leak in the system. Again, this could be a costly repair and will definitely need attention from a garage. Like the other types, there are also different causes of black smoke, and one of the main factors to take into account is whether your car is petrol or diesel-powered.
In a petrol car, black smoke is a sign that too much fuel is being burnt. If that's fine, then the next step is to check whether the fuel injectors are clogged and the fuel pressure regulator is clean, but this is a job better suited to a professional.
A cause of black smoke in diesel cars could be soot build-up from unburnt diesel. The diesel particulate filter DPF is designed to trap soot from unburnt diesel before it pumps out of the car's exhaust, but if you only ever drive a diesel car at low speeds, the soot deposits can build up over time, and could result in a warning light flashing on the dashboard.
Find a nearby dual carriageway or motorway and accelerate your diesel car to 70mph briskly, this should dislodge the soot which will appear as a ball of black smoke behind the car, and probably leave soot deposits on the road, too. This should clear the warning sign on the dash, and might help your car feel a bit faster to respond, too. If the warning light flashes up regularly, then a diesel car might not be right for the kind of driving you do, and it might be worthwhile changing to a petrol or hybrid model instead.
If you're looking at a used diesel car that seems to pump out black smoke in regular driving, then get under the car to make sure that the DPF is still part of the system.
Some unscrupulous garages have been known to remove the DPF from a troublesome car to stop issues arising, but this will cause the car to permanently pump out diesel soot, and will mean a potential MOT failure in the future.
Want to keep problems like this at bay? If your exhaust starts blowing blue smoke, it's best to pull over and call your roadside assistance provider, if you have one. If you keep driving, not only are you creating a hazard for other road users, any leaking oil could catch fire in your engine bay. If there is an excess amount of black smoke pouring out of your exhaust, then you have a bigger problem. The sensors, injection system or fuel line may not be functioning properly, all of which will need a trip to the workshop to address the problem.
Leaving the problem may cause you to use more fuel than usual, as well as creating a hazard on the road and potentially making your car unroadworthy. As with blue smoke, it's best not to keep driving with it, as any fluids coming out of the fuel line are potentially flammable. Take note of any loss of power, or rough running at speed or idle and noises coming from the engine.
Enter your email address and we'll email you a digital version of this coupon that you can present on your mobile device at your Sun Auto Service Shop. Skip to content. Find a Location Locations. Make An Appointment Appointments. This comes from condensation building inside the exhaust system. It quickly dissipates into the air and there may even be a slow drip of water from the tailpipe.
White Smoke — Could indicate that coolant has penetrated the combustion chamber. Although coolant contains water, the white is from the coolant, as the water evaporates and becomes steam from the tailpipe.
White smoke could indicate the head gasket is leaking, the cylinder head is cracked, or the engine block is cracked. Coolant smoke will often present itself before the vehicle overheats and often has a sweet smell. Preventative maintenance and repairs are our specialty at Sun Auto Service. You can trust Sun Auto Service for all your auto needs from simple oil changes to complete transmission rebuilds.
Give us a call or stop into any of our convenient service centers today! Enter your email address and we'll email you a digital version of this coupon that you can present on your mobile device at your Sun Auto Service Shop. Skip to content. Find a Location Locations. Make An Appointment Appointments. Email me this coupon. Print this coupon.
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