Bad gas or diesel fuel. Bad injector, timing, air cleaner plugged, fouled plugs, carbon build up to name the most common.
Spark plugs don't smoke. A bad alternator would cause a dead battery.
Stuck or broken oil rings can cause blue smoke.
Of course it is. Even second hand smoke can cause health problems.
Incorrect Timing Can Cause Backfire.
no
what might cause black smoke from exhaust and a bad smell from a 94 ford explorer
from the smoke they have bad flammable things
No, it will not cause smoke from the exhaust pipe. However the leaking oil can drip on the exhaust manifold where it will be burnt and smoke.
A bad air filter can cause black smoke or bad fuel injector and maf,tp sensor
A bad PCV valve can cause the engine to smoke. The valve is easy to change in most engines to correct the problem.
Having a bad timing belt can make your exhaust discharge more smoke than normal. A bad timing belt can also cause issues with starting your engine. To avoid problems, timing belts should be changed every 60,000 miles.