I got isuzu npr300 its hard to start on cold days and once started it idles rough and blows blue white smoke and clears up in 500m and once get warm then no problem all daytry to cut off
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what color smoke --black needs tuneup --blue burning oil --white steam burning coolant ---if from start up on cold days then clears up later while driving that would be condensation burning off from in the exhaust system
It sounds like you have a bad gasket. When you start the engine it is cold and everything is contracted allowing possibly coolant to get into the pistons. Once the engine warms the metal and gaskets expand, closing the leak off. This is only a guess though, not knowing the make, model or year of vehicle and not knowing if the smoke is blue, black or white it's hard to give you a more definitive answer.
www.cumminsforum.com > ... > 3rd Gen. Powertrain Jun 5, 2010 - 9 posts - 7 authors
I have an 06 Dodge 5.9L that has a light white smoke and rough idle when first ... 2006Ram 2500 QCSB 4x4, 3" Carli coils w/ 1" Daystar spacer, ... Still ran good tho, dispite the exact conditions you describe on Cold Start up.
Worn valve guides allow oil to drain into the cylinders, causes blue smoke, fouled plugs will idle rough.
Coolant in the cylinders from a blown head gasket will cause white smoke.
You don't mention what that smell is reminiscent of?
You don't mention the colour of the "smoke" and you didn't say whether the engine is petrol or diesel?
You don't mention whether the road behaviour/performance is normal?
White smoke is almost always steam or in the case of a diesel it could be an unburned fuel mist, grey/black is excess fuel and blue or grey/blue is burning oil.
Some steam is fairly normal until the engine and exhaust system is hot but excessive amounts could be one symptom of head gasket trouble. If the engine is drinking coolant and sending it through the exhaust as steam it will sometimes smell spicy.
Burning oil smells a bit like burned eggs in the frying pan.
If the car hasn't ultra-low sulphur oil and fuel the catalytic converter will convert sulphur traces into hydrogen sulphide - the bad egg gas...
There can be several reasons for this. You can have worn valve stem seals on the valves, which may change with warm oil, or you have worn oil rings in the cylinders.
A compression test when the engine is cold would reveal if the piston rings are worn. Another possibility could be a bad head gasket which leaks oil when cold and then seals when the heads warm. A compression test would also diagnose this.
Sometimes on cold days if the cranking amps on the battery are low, then it will be hard for the vehicle to start. Also, check the oil level. If the level is low it will create a hard start and rough idle for the vehicle.
White smoke is caused by coolant or water
coming out the tail pipe. There is a
chance that the white smoke was caused by
water splashing up from a puddle onto the
exhaust pipe. Keep an eye on the
coolant level in the radiator in any event. If its less then there leak coolant leak in the car engine which is causing this problem....
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