Hi,
from about 3-4 months my kia rio 1.4 dohc have a very high fuel consumption (8km/l urban, 11-12 on the highway) and loss of performance (the engine have many difficult to accelerate also with transmission in neutral) . I changed the spark 2 months ago without results. Yesterday i removed the spark and i noticed that all the 4 spark are black and also the piston head (in the part visible by the spark hole) is very black and wet. Now i already changed the spark (the previous was bosh super plus FR 7 DCX+) with ngk BKR5ES-11.
Today with new plug the engine seemed slightly more responsive (or is a placebo effect!!!!).
On the web i read that the problem maybe a too rich mixture. What do you think could cause this problem? Lambda sensor, Map sensor or other????
The engine check led still goes off, so for the ecu there aren't problem....
from about 3-4 months my kia rio 1.4 dohc have a very high fuel consumption (8km/l urban, 11-12 on the highway) and loss of performance (the engine have many difficult to accelerate also with transmission in neutral) . I changed the spark 2 months ago without results. Yesterday i removed the spark and i noticed that all the 4 spark are black and also the piston head (in the part visible by the spark hole) is very black and wet. Now i already changed the spark (the previous was bosh super plus FR 7 DCX+) with ngk BKR5ES-11.
Today with new plug the engine seemed slightly more responsive (or is a placebo effect!!!!).
On the web i read that the problem maybe a too rich mixture. What do you think could cause this problem? Lambda sensor, Map sensor or other????
The engine check led still goes off, so for the ecu there aren't problem....