I have vitz 99 with CNG installed . Recently i am getting 2 major issues in my car .
1.RPM gets too low specially on AC and car engine gets off almost on every signal .frequency in petrol is low and on cng its always .
2.Breaks almost doesnt work on AC with petrol and cng both . This happens specially when the car is running at a low speed .
I have checked couple of mechanics but dont get any satisfactory answer . There is one famous Guddu mechanic in tariq road who is saying its due to engine weakining and if you change only the engine assembly this will be solved .
He serviced throttle body and also changed choke sensor to adjust the RPM . Also tappets are checked and they are not tight .
Another mechanic from toyota motors is on a suggestion that it is nothing with the engine , there is something electrical fault
Please give your experience only those who have faced similar problem and also how this was solved .
Also if anyone knows some expert mechanic to fix this . Kindly provide his address and contact no .
Waiting for your answers anxiously .
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