Toyota Camry 1998 with 116k mileage. Drives great but there is always carbon deposit on tip of exhaust.

No check engine sign on dashboard, engine emmits steam when starting up in the morning clearing the carbon soot on exhaust. Check on spark plugs shows no sign of carbon on it , after driving round the black carbon comes back.

Noticed white smoke from the exhaust recently. The smoked stopped and it appears it affected the fuel consumption.

If u check the auto section library, u will see where it was discussed in full. U may av to change the brain box via rewire.

thanks blank, but not all case require change of brain box. Bad oxygen sensors makes car smoke. if it was the brain box , computer scan will indicate it but in my case the check engine light is not on.
Want to believe it is something that cant be detected by computer scan that is faulty

When you start your car the check engine light should come on then go off to show that the bulb works(for all system), if it does not come on then the bulb might be burnt.If its not burnt then the system is not bad enough to trigger the OBD system.

When the car is due for service just get the filter and a 10 30w from a good source.

Its normal for old engines to have blow-by burnt in engine. It shows more when you accelerate.
All engines burn some oil

@ sultan
the check engine light is ok. The check engine light comes on when you turn on the car ignition.

Could it be something to do with the catalytic converter (does it have one?) The main essence of the CAT is manage the exhaust products.

http://en.wikipedia.org/wiki/Catalytic_converter

Use some fuel cleaner they sell it at gas stations it helps remove this and also if you have fancy exhaust make sure that it’s not preventing the flow of exhaust vapor and sending some back to the engine. Also check for leaks