as discussed earlier, in light of your suggestions i worked alongwith my mechanic to execute your advised procedures in the same sequence. While adjusting the CO and distributor, we could not observe any knocking/mnissing in teh engine behaviour, means engine was already finely tuned on petrol. because as soon as we adjsuetd the distributor, engine started emission of water drops from silencer.
However subsequently the thing which struck to my mind was that a fact was kept ignored during last 2 years was the rubbur bush inserted in the air intake pype.
I always took this rubber bush insertion as a benchmark and never removed it while on petrol (just removed the tape).
So i decided to remove that rubber bush also. mechanic was not agreed but i did it.
After it when we staretd the engine on petrol then it roared like lion and pick up was also very much improved.
It was first time in 2 years that i enjoyed the petrol driving. Stil now i have not inserted the rubbur bush back in the air intake pype and also not intended to do so. is there any draback of the same???
Instead i intend to put some cover on the air intake pype for CNG as its "removal/fitting back" will be easy for petrol driving.
usage of scotch tape is also cumbersome. Do you have any other idea for it.
I know that to calculate the petrol average, we have to top the tank which is not affordable right now (50Lx89=rs4450)
For random testing, while on petrol, i fully closed the air intake pype but engine was fine,,,why???? is it normal behaviour.i think it should have shut down, is't it.
Today morning, I temporarily affixed the scotch tape on the air intake pype and drove to my office and forgot to advance the distribitor but car was moving fine CNG.
I think it should have slowed down but it did nt happen? Why??
Looking for your kind response pl.