The car in particular is a 2007 vitz with 3-cylinder 1kre-fe engine. Its giving me primarily two problems; low mileage and black smoke. There is also a slight decrease in pick of the car.
To solve the mileage issue, I took out the injectors and MAP sensor. Leak, uniformity etc tests were performed on Ultra-sonic injector cleaning machine and the injectors were found to be OK. The MAP sensor had some oily residue on it and it was cleaned using carb cleaner spray.
The spark plugs were replaced last month so didnt bother with them. Pressure test showed 130 psi in each cylinder upon ignition. Oil level was reduced to somewhere in the middle between the points on the dip stick. I changed the oil but used SAE-50 oil this time upon the mechanic's recommendation (was using 10w-30 previously).
As a result, the petrol smell in exhaust has reduced but black smoke is still there. I will check if there is any change in fuel consumption later this week.
Any help in solving the black smoke issue will be appreciated. Thanks!
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