I have recently got a civic 03 A/T. Strange behavior which i face is that when it is started cold, it starts on petrol and immediately shifts to CNG causing engine to stall. Then takes 2-3 tries to start on CNG. Next issue is that it idles smooth around 1000/1100 rpm at P or N but when put in D its rpms drop immediately to a point where it seems as no rpm are there on odo. Also gives high vibrations at this point but still runs. Moreover, when AC is switched ON idle rpm slightly reduce but do not increase as used to be in my previous carby ride.
My questions are
1. is it normal to start like this for a CNG converted civic? Shouldnt it shift to CNG when accelerator is pressed to increase rpm to some limit ?
2. is it normal for rpm to drop when putting car in gear as load increases? Shouldnt ECU compensate this load and increase rpm ?
3. is it normal for rpm to drop when AC is switched ON as load increases? Shouldnt ECU compensate this load and increase rpm ?
It is my first experience with EFI car so trying to learn it and need support from all Pakwheelers and specially from @Xulfiqar who has always guided me as well as others in past.... @irfan44 your comments too plz.
One more question i have that when car is on CNG should its fuel pump keep on running or there is some mechanism which should cut its supply off so the fuel pump is not running all the time even when car is on CNG.
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