I have a Nissan Sunny B11 (1985), we have this car since it was zero meter. It has always been a solid and trustworthy car
Been using CNG for the past 8 years and was driven on petrol on very few occasions since CNG installation. Now when i try to use it on petrol it gives black smoke and consumes a LOT of petrol averaging around 5kmpl.
I took it to two mechanics and both were not able to solve the issue, one of them told me that the mixture is faulty and we need to replace the carbeurator.
Now it is pretty difficult to get a new carbeurator and i dont really know if it really needs to be changed or the mechanics are simply ignorant. Can some one please help me with it. let me know if i need to post some pictures or what.
The car has done 185000 kms. (we dont use it a lot) The engine required overhaul once at 165000 kms. and it was running smooth after that but this carbeurator is now messed up for no apparent reason. It drives smoothly on CNG.