Car toyota corolla 2010 ..both on cng and petrol
Today i noticed when my car is idle and on petrol,then i full press accelarator pedal the rpm needle not crossing 7000 and engine give weird noise ,its 9000 rpm total...and then i switch to CNG and then press pedal rpm needle completes all 9000 rpm..
tell me whats the matter why on petrol RPM needle or engine not able to cross 9000rpm???
EXperts..?