For CNG the air hose above the air filter need to be blocked about 60% with a sheet metal strip to block the intake air. Then hold the engine rpm at 3000 and start closing the high speed gas feed nut till it runs smooth. Let it idle and then start tightening the idle speed knob at the gas kit regulator to obtain the stable idle rpm. This way you could enjoy more power and maximum fuel average. It will also prolong the engine life, with the reason that it come out of lean fuel state on CNG.
SOURCE: VIBRATING BRAKES ON A 2005 HONDA ODESSY
I am having the same problem with my breaks. The dealer checked it and said there was nothing wrong. I am taking it back again now that I see other people are having the same problems! I feel so much better now that I know I am not crazy!
SOURCE: Honda Accord 2003 - Engine and steering vibration
You might to have a tire shop check the wheel for roundness, not balance. A tire can be balanced and be out of round, causing the shaking you describe. On front wheel drive cars, the wheel/hub assembly may be bad, which a good tire shop can tell you if it is. Can't say if it will be expensive, the hub is relatively inexpensive. Labor will probably be the deal-breaker.
SOURCE: enging vibrating at idle
1) It is very possible your engine mounts can be worn, but
2) the vibration you feel may be also due to the idle itself degrading to the point that the car is shaking. Does the engine sound like it is getting ready to die? what is the engine rpm when you feel the vibration? You may just have a dirty throttle body. In this case, clean the throttle body plate and bore and the problem will go away.
3) did the problem seem to come on suddenly or gradually, if gradually, you may just need some plugs and/or wires, and/or cap/ignition rotor, etc. (a tune up)
4) Also, do you only feel the vibration when the AC system is on?
5) there are some other reasons for abnormal engine vibration at idle, but the above are some of the most common, and simpler to repair.
All the best with the repair!
SOURCE: 1998 honda crv vibrates when starting out
Increased vibration from a vehicle indicates worn out engine supports. This vibration often disappears when revving the engine high, but is very noticeable at low revs.
You can have these inspected and possibly replaced to reduce the vibration cominf from your engine.
Hope this helps.
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