Apparently we are burning oil so when you lift the hood it is really black under there plus you can see the muffler is completely black too. We also are having problems with the idle it idles REALLY LOW, where to if we stop for any reason the car dies, because it can't recover from the low idle, we have resorted to braking with the left foot and applying pressure to the gas with the right. The check engine light is on and the mechanic that we took it to says there are no codes coming up...another mechanic suggested a vacuum line, we also have a crack in the exhaust manifold from the sensor that is right there...If anyone can help we are at our whits end and about ready to drive it off a cliff...or buy a new engine but if we don't have to would be wonderful.
If the lite is on there is a dtc, youre best bet is to take it to a honda dealer, they are usually a little more than the corner garage but they deal with hondas everyday and you mite end up saving money in the long run because of less diag time, they have the exp with hondas..goood luck
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you have sort of an swered your own question, its burning it slowly, it could be the piston rings have warn and the oil is seeping past them under presure and being burnt in the fuel, not not noticably enough to signs of smoke from rear , try checking the muffler/rear box and see if there is a sticky oily residue on it, for normal running it should be verry dark grey not pitch black and powdery, if its tacky and like tar, then you are burning oil. hope that helps
If it is smoking under the hood then you may have plugged the air filter. You also have a chance at burning up anything that is around the leek.If you have too many exhaust leeks it takes away the back pressure .Too mutch free flow is not always a good thing .So yes this could cause it to run like S$%T. Hope this has helped.
You have stated two problems. Coming to second first. Smell of burning rubber. in the car rubber is only at two places where it can burn, The tyres, unlikely as you have not commented upon your driving habits. Some people like to rev the engine so much before take off that the tyres go burning for the first few hundred meters. And then there is rubber on the wires and cables. You have to check the wires for any heat while the engine is running.
Coming to the first now. White smoke is generally of unburnt fiel and not oil. Oil alwayd give black smoke and that is the indication you get when the exhaust is giving black smoke. That means that the engine is consuming oil. if it is white then that indicates that the engine is cold and burning more gas/diesel. Is your a diesel vehicle?? But as you say it from under the hood. And that too behind the engine block. May be that the gasket is leaking from somewhere. If you could check the engine oil level for a few days early in the morning before starting the engine. If the level drops and the exhaust tail pipe does not blacken your finger when you rub it in it would mean that the oil is being burnt. Now what I suggest is that with the engine running and hand brakes on, go under the car with hood open and try to locate the source of the smoke. I am sure you would be able to locate it.
Then we talk again.
Check your muffler, is it thick black? The engine is burning oil, you need new engine if the cylinder ring is bad (compression test), and new catalytic converter that poisoned by excessive oil.
Many altima 02 has pre-catalytic converter failure that cover under 8 years/80k miles emission law. The materials in the pre-cat destroy the engine. It is well known problem and you can get new engine under this warranty
Most likely cause is a leak in the valve cover gasket. Under pressue, a good sized leak will spurt and burn off on the manifuld, causing the smell of burning oil you're getting. This also would cause the presence of oil throughout the engine compartment. Best of luck on your problem.