My Pajero is running rough has white smoke why ???

bad injector or fuel injection pump

White SWEET smelling smoke, or white OILY smelling smoke? If it's white thick SWEET smelling smoke, you have a blown head gasket - that's the smell of antifreeze burning in the engine, which it should NEVER do. If it's white OILY smelling smoke (smells a lot like diesel), then you're getting too much fuel into the cylinders.

If it's sweet-smelling smoke (antifreeze), pull the oil dipstick & check the oil level. If the oil level is HIGH and the oil looks like a mocha milkshake, that's absolutely conclusive - that's what happens when antifreeze gets into your oil, and it's nasty corrosive to engine parts.

I'm not at all surprised that the oil light is on if it won't start - you won't get much oil pressure until the engine is running.

Did you have the head reworked with the motor cause it sounds like the valve seals are gone and letting oil leak back down.

Hi Gina.... Rough idle could be a number of things. The easiest and cheapest thing you could do is to replace the fuel filter. Usually they will run just a few bucks at the local auto store. If that doesn't do the trick, try to see if your car is smoking at all and try to determine if it is blue, black, or white smoke. Usually a blue smoke is oil, black is usually fuel richness, and white is coolant. White and blue are the most serious. If you are just burning extra fuel, you might need a tuneup consisting of new sparkplugs, maybe new sparkplug wires, new distributer cap, and distributor rotor. This might be a good time the change the oil and oil filter as well as check the other fluids such as transmission, coolant, and brake. Joe

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You generally only get white fuel smoke from a diesel when one or more cylinders aren't firing. If it were injecting more fuel than can be burned into a cylinder that is firing you'd get black smoke. You can get gray smoke from a cylinder that is firing cold or late, but blue obnoxious smoke is more common with late injector pump timing. Dirty/failed injectors also generally make a rude blue smoke.

Run a can of Diesel Kleen through it. If you can't get it where you are call a local truck service and ask what they recommend for cleaning the pump.

Check and keep watch on the oil and coolant- white smoke from a warmed up diesel is usually coolant that is getting into the combustion chamber, typically from a failed head gasket or cracked head/block.

If you see any oil floating on the surface of the coolant, or if the oil starts to look milky, this motor must be serviced and the issue found or it won't last long.

lp

White smoke is usually from water and water will make the car splutter. Did you get water in your tank at some time. If you have water in your fuel, you will have to drain the tank and refill with good fuel. The engine will run fine once it is hot but if a lot of water goes into a hot cylinder it can cause a lot of damage.

check the fuel injector....some times there may be dust accumulated in it......engine misfiring may also be a reason for such a fault as u said....... jus check these two conditions....surely one of this ll be a problem from my view.. good luck!!!!!

If your engine is not misfiring but it vibrates too much while idling your motor mounts might be getting worn out. I had a Nissan with bad motor mounts. I was ok in park but when you put it in gear it vibrated a lot. It smoothed right out as soon as you started moving.

One thing to check is the fuel pressure regulator.
If the diaphram is leaking it will cause gas to be pulled into the vacuum system causing lots of white smoke and extreme rough running.