I have Spectra Model 2003, Factory Fitted CNG, 66,000 KM done, soundless powerful engine, excellent pickup, but it misfire when it running on CNG, no misfire on Petrol, second thing it gives only 50KM with AC in city on CNG full Tank, it has factory fitted two cylinders. (CNG filling cost is Rs 580 giving 50 KM)
I have changed its Coke sensor, CAM sensor, Timing Belt, Timing barring, Coils, Plug Wires, Plugs,
After changing its coils its misfire reduced
mechanic says its coke senor is not working, i purchased coke sensor last month for Rs 2400
please help me I have spent a lot of money