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  1. Nitin
  2. CNG Kit, LPG Kit
  3. Wednesday, July 18 2018
Hey Admin,

I recently bought a 2009 Honda City ivtec with sequential CNG kit installed. The problem with the car is that when the car is idle, the rpm drops to 500 or below and finally stalls (rarely rpm picks itself up).So what happens is that the sometimes rpm stays rock solid when idle but mostly it drops. Then I've to changeover to petrol, switch the car ON and then change it back to CNG.

In this process there are two observations :
1) When rpm stays rock solid - The car has better pick up at any level of rpm (irrespective of the gear)
2) When rpm goes touches 500 - The car seems bogged down, there is no response. Even after flooring the accelerator, the car does not respond beyond a certain level

My key takeaways from these observations is that some critical part is giving erratic feedback to ECU/ECM or the ECU/ECM is itself faulty. This boils down to three critical components which may be the culprit
1) CNG Reducer
3) Map Sensor

I've tried every possible primary remedy suggested by various CNG fitters and even mechanics.

Based on one suggestion, I installed new ignition coils which has resulted in better pick up and response, but the situation stays the same.

Please suggest basis these observations mentioned, which part may be at fault. Let me know if these details are enough for you to access the situation (and the fault). If not, I'll provide you every possible intricate detail.

One more help, please suggest a knowledgable CNG fitter in Delhi NCR who takes sense, isn't dishonest, doesn't loot you and can help in this regard in one go possibly.

I'm very much fed up as no one is able to rectify this and such hit and trials are causing a huge dent to my pocket.

I've installed new NGK Iridium spark plugs, new Ignition coils, genuine Air filter. Other than that radiator has been cleaned, throttle body has been cleaned and coolant has been changed.

Best Regards
Admin Accepted Answer

Could you check out from previous owner has he faced the issue from beginning.
When was the kit installed by him and since when was the previous owner faced the issue.

Most probably by replacing in
> CNG reducer Filter
> CNG Low Pressure filter
> CNG O'ring

and tuning in CNG Kit can help in address in the issue
As you have already replaced in reducer cartridge and possible tune in the kit
Could you check to replace in low pressure filter cartridge and see if that solves the issue

Possibly if not then it requires the kit to be thoroughly checked and inspected in from a reputed CNG Retro fit center
Hope should help !!

  1. more than a month ago
  2. CNG Kit, LPG Kit
  3. # 1
Ajay Y Accepted Answer
I dont know, if your issue is resolved.

Please also check Throttle body, Throttle body tends to get dirty faster on CNG. You can get it cleaned or swapped with OK car to confirm.
Also, please confirm, is there any issue in Petrol Mode.

  1. more than a month ago
  2. CNG Kit, LPG Kit
  3. # 2
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