Thanks every one for the valuable comments. follwoing is the update ;
Yesterday, Me and my friend went to Toyota Garden (Kalma Chowk) with an understanding that we will ask them to bring the car in its original position coz we dont need cng anymore.
When we got there and told them to do the above, we were surprised when the technician told us that toyota garden and many other 3s dealers have started installing CNG and if you wish to keep your cng we can tune it too.
My friend got tempted and agreed to keep the CNG (again) . Toyota guys started the diagnosis and after about 2 hours gave us the following report.
- Our previous CNG guy had tempered with the throttle bodies preset switch in order to increase the RPM on CNG and toyota in pakistan has no way of setting it again as it comes preset from Japan.
Solution: replace the complete throttle body (cost : 30,000 +)
- Engine Head valves got sticky or tight due to CNG. According to toyota this is very common in new corollas having 40,000km+ mileage on CNG.
Solution: complete engine head overhaul (COsT: 70,000 approx)
Total Estimated Cost : Rs: 105,000/- :o
I was there listening to them, according to me, they were right about the tempered throttle body, the setting screw was sealed with a drop of glue which that moron intentionally messed up by removing the glue and altered it.
I am not sure about the head valve theory, they must be bluffing. it may be sorted by adjusting the valve tappets. I hope.
Note: toyota is saying valve get stuck after 40,000 on CNG and they are now them selves installing it. COZ they know people will not stop using CNG so why not earn from it and subsequently more from repairs
Please guide me to a good place for the above mentioned issue as my friend cant afford it on his own and cant ask from his dad as the car is just 8 months old. Rs. 105,000 is unjustifiable.