First I thought to post it in the thread started by @ diesel_boy, but this topic is a bit different so started a new thread. This what was said earlier;
@ Mr. Logas,
A friends CNG civic 2001 model also has a Rough Idling Problem.
And my search of internet tells me that the Venturi is the main problem.
In that civic the Venturi is installed inside the airfilter box. Can you kindly tell me if Genuine/Original venturi designed for the Civic engines are available in Pakistan? and what is the cost? ........because when I look at the venturi it seems like a desi stuff!!
Can you also guide us towards the permanent solution of rough idling on Civics?....The problem is more significant when the engine is Cold!
Thanks for your consideration
Mr. Logas replied as:
If you are a regular visitor of PW, you must hv readmy several posts that the most and common problem is the type, size and placement of mixer (ventury), if you use an imported gold plated mixer.... of wrong size, type and place it in the airfilter box, it will give you the same troubles.
So if by looking at the material and craftmanship is poor and the size, type and placement is correct, it will do the best job.
Ask your installer to place it as near as possible to the throtle body neck. Hope the same will give you some difference, then ask him to change the size and try to adjust it.