Hi i have mazda 323f 1998 model i have problem with my car its giving black high smoke i changed the heat sensor & air sensor but still same problem.
plz plz tell mee the solution plz ...."
Black smoke usually indicates an overly rich air-fuel mixture--unburned fuel is escaping as the black particles in the exhaust.
Overly rich fuel can be caused by many things. The first thing I would do is hook up a diagnostic device (i.e., an OBD-II code reader) and see if your on-board computer is reporting any odd readings. You might have a fault with your O2 sensor (quite common), for example. A stuck thermostat would prevent the engine from ever properly heating up, so if that were the problem, the computer might register abnormally low coolant temperature readings.
Some less likely possibilities might not show up in a code scan. A completely clogged air filter might limit air intake so much that the computer can't properly adjust the air/fuel mixture. A bad catalytic converter (which is no longer taking care of unburned fuel before it exits the tail pipe) might also not trigger a trouble code, depending on what sensors are on that component. Finally, you could have a bad or stuck injector that's simply dumping more fuel than it's supposed to into the intake manifold. (I believe this car has 1 common injector for all cylinders, not individual injectors for each cylinder. I could be wrong.) However, a bad injector would likely give you noticeable performance problems, too. If the car seems to be running well, I would trouble-shoot this possibility last.
May 09, 2011 |
Mazda 323 Cars & Trucks