Dear Fellows.
My Name is Muhammad Faisal Imam and worked as a parts analyst since 8 years on Diesel Engine Cummins, I have also this issue on liana RXI 2006, I have changed the factory fitted CNG with Lindrenzo CNG KIT from Madni CNG Baloch Colony but prolem is still there pick and humming problem is not sorted it out, so Finally I have tracked the issue for that and nobody can find this as I follow it up since 8 Months,
Solution is Just Reduce your Air Supply on CNG but How, Cut a 1.5 Liters Pepsi or mineral water bottle and fit into a Air Filter Supply the small neck will be on side of engine and big end will size on air filter side, mean reduced the Air Filter Diameter with low nack of air filter hose, matlab k Ek Bottle Kat k air filter k mun pay jahan say air aaiti hai wahan laga dain kun k air filter ki supply ka path kafi door hai to boost preesure of air filter supply kam hu jati hai jis ki wjha say Car Vibrate and missing karti karti hai us k bad
CNG ki seeting karwaing or almost 900RPM par car ko rakhin this is my experiance
Call kar k poch skatain 03335992199.
Regards