CNG Kit Issue ... Idling not proper

Home > Gari Forums > Others Forums > Others Other Forums > Others Other Fuel Economy Forums

CNG Kit Issue ... Idling not proper

Hi All

Well I have Baleno 2000, CNG kit Installed almost 7 months back (LandiRenzo). The problem i m facing now a days is, When I filled the CNG cylender, soon after that in idle position, The car vibrates too much and by time when the Cylender is getting empty after some use, specially when I have totall 50 bars left in tank, The idling gets proper.
I come to know that this could be a diaphram issue .. Is it so ???

Also now a days i m facing too much tha tha (Backfire) problem too .... if it also have some connection with the issue mentione above ??? as it also happens when the Cylender is filled )

Saqib Bhai I know you have a solution... So Help Please ...

Gari.pk User 3487 asked on 06 Jul 2010 13:35:07 pm

1 Answer

604 views |

Zubair - on 06 Jul 2010 13:35:23 pm

Here is how you should understand your problem, that is: you must know how a CNG Regulator (landi renzo) works.

CNG Regulator

A CNG regulator has a typical 3 stage (or phases). The Stage 1 is basically a gas reducer in which it reduces the Gas from 200 bar to 3 bars. This is why sometimes you can hear people calling a CNG kit as Reducer.

It is likely that you are having problem with your Stage 1 - CNG Reducer. At high pressure, the reducer is NOT performing properly and obstructing the gas reducing mechanism. Replace a new CNG Regulator as testing sample will identify this problem.

Alternatively, you may be using a Pakistan-made Landi Renzo, which may not have a Pressure Stabilizer feature. This feature holds the gas volume outflow at a constant rate, irregardless of the pressure in the cylinder. Italian-made Landi Renzo does NOT have this problem, unless the Stage 1 is faulty.

As per Stage 2, it acts as a CNG regulator. It regulates that the gas outflow to the engine remains at a constant 3 bar - 4 bar or near 40 psi. It works like a PC power regulator in how the output at a constant rate.

At Stage 3, this stage is mainly the Gas Output Controller to increase/decrease gas flow into the engine. A diaphragm is used and it operate a plunger or a spring-activiated piston. The diaphragm will move when it detects low gas volume at the Mixer hose and it will release more gas to equalize the pressure drop. And vice versa, it will decrease the gas flow if the pressure is high.

Your problem looks like a Stage 1 issue, but it can also be other areas, like no hot water attachment, faulty shut-off valve and etc.