My corolla SE Saloon Auto 2004with 80,000 KM done has developed a strange & difficult to trace fault.
Occasionally (sometimes after 100 Km , sometimes after 800 KM) it starts misfiring with a little black smoke at low rpms (800-1500 rpm). This condition persists for 4-5 minutes & then vanishes itself.
The 'Check engine Warning Light' on dash board does not come up due to which no Error Code is being generated & saved in the ECU.
I took it to Toyota capital motors twice. They connected their diagnostic computer but since at that time the car was fine so they were unable to trace the fault. They replaced air,fuel filter, auto transmission fluid, spark plugs & made a bill of around Rs 13,000/-.Second time thay checked pressure of fuel pump & also flushed fuel tank.
After few days the problem occured again & they said that v r unable to trace the fault since no fault code is aval in the ECU. They say that let the fault aggravate otherwise it is just a hit & try.
They suspect the air intake sensor but are not sure.
I dont think that there is any other workshop in pindi / Isb with more advance eqpt than Toyota Motors.
Is their any solution to this problem or should i send the car to Toyota Indus Karcahi??
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