Originally Posted by ram123
My maruti 800 2002 mpfi model is letting out more gases than specified in emission test.
I had recently taken to service centre in vijaynagar bangalore
They told me that it is either due to
1) dust in o2 sensor
2) bad adultrated fuel
3) tappet adujustment wrong.
Recently they had cleaned the throttle body after which this problem has occured
Carbon gases is showing value of 4.5 whereas legal value is 2
What could be the problem
How to solve this ?
Is the fuel being not burnt properly
Meanwhile my mileage has dropped by 2-3 km per litre
experts please help
It may be oil burning into cylinders.
As your car is fuel injected.
There is less occurrence of over fuel.
Oil burns and send out too much of carbon out.
Please do a compression test . its important.
Dusting o2 is not a big deal.
Checking it works is the matter.
Take it out and read with a multimeter the voltage reading form it.
It must produce enough voltage using atmospheric oxygen.
Voltage will be in 0.7~ not 0.07
Check it out and replace with a good sensot from a well pollution controlled car.
Then check for pollution.
Then after that you buy a new one
Also check for wiring from sensor to efi system