Loud exhaust
Description of problem: There is a loud exhaust noise which may be coming from either the front or rear of the vehicle.
Probable Causes:
1. Muffler or exhaust pipe worn out.
2. Exhaust manifold worn out.
Gray smoke from the exhaust
Description of problem: You notice a grayish smoke coming from the exhaust when you start your car. The smoke may still be there after the car is warmed, but it may be less noticeable. The smoke may have a bluish tint to it. This problem normally develops over time, and the amount of smoke indicates the seriousness of the problem.
Probable Causes:
1. Worn piston rings.
2. Worn valve guides.
3. Damaged or worn valve guides.
White smoke or water vapor from the exhaust
Description of problem: You notice a white smoke coming from the exhaust when you start your car. This may be normal if the weather is cold. However, if the smoke continues after the engine is warmed up, there is a problem. This problem normally develops over time, and the amount of smoke indicates the seriousness of the problem.
Probable Causes:
1. Automatic transmission fluid may be entering the intake manifold through vacuum connections.
2. The engine's cylinder head gasket may be bad.
3. The engine's cylinder head may be warped or cracked.
4. The engine's block may be cracked.
Black smoke from the exhaust
Description of problem: You notice black smoke coming from the exhaust when you start your car. The smoke may still be there after the car is warmed, but it may be less noticeable. The smoke may be accompanied by engine idling problems. This problem normally develops over time, and the amount of smoke indicates the seriousness of the problem.
Probable Causes:
1. If you have a carburetor, the carburetor choke may be stuck closed.
2. The fuel injectors may be leaking.
3. The air filter may be clogged.
4. There may be an ignition problem.
Popping noise from exhaust
Description of problem: Whenever you press on the gas pedal, you hear a popping from the exhaust. For the most part, the engine seems to run fine. However, you have noticed your gas mileage has gotten worse. The louder the popping noise, the worse the problem.
Probable Causes:
1. You have a vacuum leak.
2. One or more of your fuel injectors are leaking.
3. There is a hole or leak in the car's exhaust.
The car uses more oil than normal, and there is some smoke from the exhaust
Description of problem: You notice that the oil level is low between oil changes. This did not happen before. It appears that the oil is being burned by the engine because of the smoke in the exhaust. You may also have noticed that the car doesn't have the same amount of power as it once did. This type of problem seems to get worse once it develops.
Probable Causes:
1. The PCV system is not working properly.
2. The engine may have mechanical problems.
3. The engine's valve seals may be worn.
4. The engine's piston rings may be worn.
There is a rotten egg smell coming from the exhaust
Description of problem: Whenever you run the engine and are not moving, you notice an awful smell from the exhaust. The smell is like that of rotten eggs. Not only do you notice this, so does everyone around your car. You may also have noticed that your gas mileage has been worse lately.
Probable Causes:
1. There is a problem with your electronic engine control system.
2. You have an ignition problem.
3. Your fuel pressure regulator is bad.
4. The engine may have mechanical problems.
5. The engine is running too hot.
There is a strong gas smell coming from the exhaust
Description of problem: Whenever you run the engine and are not moving, you notice the smell of gas from the exhaust. The smell can be strong enough to make you think you have a gas leak. Not only do you notice the smell, so does everyone around your car. You may also notice that your gas mileage has been worse lately.
Probable Causes:
1. There is a problem with your electronic engine control system.
2. You have an ignition problem.
3. Your fuel injectors are clogged or dirty.
4. There is an engine mechanical problem.
5. You have a vacuum leak.
6. If you have a carburetor, the choke may be stuck closed.
The car uses more oil than normal, but there is no trace of smoke from the exhaust
Description of problem: You notice that the oil level is low between oil changes. This did not happen before. It doesn't appear that the oil is being burned by the engine because there is not a trace of smoke in the exhaust. You may have also noticed that the car doesn't have the same amount of power it once did. This type of problem seems to get worse once it develops.
Probable Causes:
1. The PCV system is not working properly.
2. The engine may have mechanical problems.
3. The engine's valve seals may be worn.
4. There may be a small oil leak.
The car uses more fuel than normal, and there is a strong gas odor coming from the exhaust
Description of problem: You notice a tank of gas doesn't last as long as it used to. You also smell raw gasoline, especially when you stop the engine. You don't find obvious signs of a gas leak such as puddles under the car. You may have also noticed that the car doesn't have the same amount of power it once did. This type of problem seems to get worse once it develops and can lead to other serious problems such as not starting.
Probable Causes:
1. The fuel lines may have a leak.
2. The engine may have mechanical problems..
3. The fuel pressure regulator may be operating at too high a pressure.
4. The fuel injectors may leak.
5. The gas cap may be faulty.
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