Excessive consumption

Hi, I have an Almera N15 with ga14de engine and lately it's consuming a lot. The engine runs very well, don´t stall, starts all mornings with no problem. I put 20 litres and makes 200km... I have been effortlessly and don't pass 120km/h ... No reason to be consuming 10l and sometimes more /100km ...
(normal is 7l/100km/h)
I noticed that the exhaust is very black, like in diesel engines ... I think that isn't normal and something is happening.
Don´t smell gasoline or anything.
It has 136.000 km and 10 year with no problems.

If anyone can help me, I appreciate a lot.

Sorry my English
Thanks
Nuno Moniz
 
These cars gave no problems with lambda sensors but its possible you should get it checked,also check u are using the proper spark plugs which are NGK BKR5E
 
These cars gave no problems with lambda sensors but its possible you should get it checked,also check u are using the proper spark plugs which are NGK BKR5E

Thanks for your reply.

About LAmbda sensor, do you know the regular values for that? I have a few softwares to connect on my Almera; DataScan, ECUTalk, conult z, emance Consult, all free and some of them show the Lambda sensor (O2) with a value but I don´t know the correct value. If anybody knows please help me with this.

Thanks a lot.
Nuno
 
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