Tips on Troubleshooting the Lexus GS400 Air Filter
The air filter is made of fibrous material, which blocks solid particles and contaminants from entering the engine, hence making it perform really well. However, since this is dainty, and dirt could easily build up in the gaps, it's unavoidable for it to wear out, especially if it's taking in a lot of dust and grime. You will also begin to encounter problems with the engine, which should never be ignored. Here are some tips on how you can detect symptoms of a bad Lexus GS400 air filter.
Gasoline smell from the exhaust
Whenever you start the vehicle, and you start smelling gas that's coming from the exhaust, it could mean that the air filter is damaged and that it either needs to be cleaned or replaced. Gasoline smell is caused by lack of air getting into the fuel injection system, which may be due to a clogged air filter. Because of this, unnecessary fuel for the combustion would be blown out in the exhaust.
Black smoke from the exhaust
Seeing black smoke emissions from the exhaust should be alarming to you; normally, it should be white or clear. The dark smoke is caused by a clogged air filter, which either needs to be washed or replaced if it's already worn out. When this happens, more fuel would be used in the combustion, which then causes black emissions to exit the exhaust pipe.
Reduced gas mileage
If you start noticing that your gas mileage has lessened, then you should be aware that it could be caused by a dirty air filter. If this is clogged, there's lower oxygen in the mixture, and the engine would use more than enough fuel for it to function. Hence, the mileage would significantly drop.
Rough engine sounds should also be alarming to you, and this can be caused by worn spark plugs. The root of this problem can be traced down to a dirty air filter. Because of this, the plugs could not have been firing because the head could be filthy, which is caused by grime residue on the spark lead from the rich fuel mixture.