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.