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  1. Aditya Shah
  2. CNG Kit, LPG Kit
  3. Monday, November 12 2018
I have 2014 Santro xing fitted with Msequent sequential kit. Off lately it was giving me a lot of problems like automatically swinging to petrol from cng, jerking on cng, fault light always on etc.

Consulted a few cng technicians and all suggested to replace entire wiring including ECU, MAP, cng/petrol conversion switch. This was suggested cause the cable to tune/calibrate ECU was not available for the msequent kit.

Got all of the above replaced except cng injector rail and reducer. After replacement car works smooth on cng and all previously observed issues were resolved.

PROBLEM - Now I am facing a new weird issue. After engine is off for 3 to 4 hours car doesn't start. As soon as I turn the key to start the engine, car starts and rpm goes up as it should. But then immediately it drops, even if I press accelerator pedal, rpm doesn't increase, instead it misfires and stops. I need to turn on the car for more than 5 times then it starts normally and gets converted to cng. Then everything works fine. CNG technician asked to replace all spark plugs and plug wires which costed around 2500/-. However issue is still persistent. Now he has suggested to clean petrol injectors and check fuel pump pressure with some petrol mechanic. However before injector cleaning and fuel pump pressure check, I carried a small experiment. Before turning the engine off, I change the fuel mode manually to petrol by pressing cng/petrol switch. Then I observed it overnight and next day early morning car started perfectly fine. Did this for two days and no starting issue observed.

I would like to know whether the issue is with cng kit or with petrol injectors or fuel pump. If it is related to cng kit then what could have been possible solution.

Thanks in advance.
  M Wing, Link Rd, Mindspace, Malad West, Mumbai, Maharashtra 400064, India
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Admin Accepted Answer
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Hello,

There is no issue with Petrol Injectors and neither with Fuel Pump
However, for CNG Compatibility its important that car should start on Petrol and run on it for initial 2 kms as CNG is Dry fuel and then switch over to CNG. If you doing same and still facing issues then something seems not correct in CNG Fitment and may possibly need an in mechanic inspection to scan and
> check for ECU errors,
> Throttle Body cleaning
> CNG Kit Wiring, Fitment

Hope should help !!


  1. more than a month ago
  2. CNG Kit, LPG Kit
  3. # 1
Aditya Shah Accepted Answer
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Thanks a lot admin for your reply. The issue is car starts automatically on petrol (at least as per cng/petrol indicator). When I park the car and start after 4 hours it gives starting troubles like accelerator pedal pressed but no increase in rpm and engine shuts off. After 4 to 5 self of around 20 seconds the car starts and the cng indicator light turns on. Then everything is normal. Even if I need to stop n start the car on signals it starts in 2 secinds.

Weired thing is, if I manually switchover to petrol by pressing cng/petrol switch while parking, there are no starting issues faced even if I start the car after 2 days.

The guy who fitted the cng kit says its due to injectors or fuel pump. However I don't buy his justification cause of the second scenario.

Have ordered OBD2 scanner from Amazon as per your advice, shall share error code print screen as soon as I receive.
  1. more than a month ago
  2. CNG Kit, LPG Kit
  3. # 2
khan Accepted Answer
0
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salam to all

I have mehran 2004 model, when i start it in cng it does nt starts and when start it in pertrol it starts and after coverting all is ok, But when i park my car for 2hr and then start it again it does not sttarts in CNG again even the engine look warm even after 2 hrs. please guide if anyone experienced this?
  1. more than a month ago
  2. CNG Kit, LPG Kit
  3. # 3
Pradeep Kumar Accepted Answer
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Thanks Aditya
I had the same problem as you faced and followed your tips and looks fully relieved.


  1. more than a month ago
  2. CNG Kit, LPG Kit
  3. # 4
Vipin Accepted Answer
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I have Santro xing 2012 model , same problem faced. And resolved after changing CNG ecu and resolve ecu error
Shah Accepted Answer
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Votes
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Cng kit is leaked .when you off the engine tha gas goes to to injector or carborator .when you start gas and petrol both coming for this reason starting problem .disconnet the pipe go to engine then next day try starting in morning .if ok then cng kit leaking gas continiuesli in off mode
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