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Thread: Help required for A/T civic

  1. #1
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    Default Help required for A/T civic

    I have recently got a civic 03 A/T. Strange behavior which i face is that when it is started cold, it starts on petrol and immediately shifts to CNG causing engine to stall. Then takes 2-3 tries to start on CNG. Next issue is that it idles smooth around 1000/1100 rpm at P or N but when put in D its rpms drop immediately to a point where it seems as no rpm are there on odo. Also gives high vibrations at this point but still runs. Moreover, when AC is switched ON idle rpm slightly reduce but do not increase as used to be in my previous carby ride.

    My questions are

    1. is it normal to start like this for a CNG converted civic? Shouldnt it shift to CNG when accelerator is pressed to increase rpm to some limit ?

    2. is it normal for rpm to drop when putting car in gear as load increases? Shouldnt ECU compensate this load and increase rpm ?

    3. is it normal for rpm to drop when AC is switched ON as load increases? Shouldnt ECU compensate this load and increase rpm ?

    It is my first experience with EFI car so trying to learn it and need support from all Pakwheelers and specially from @Xulfiqar who has always guided me as well as others in past.... @irfan44 your comments too plz.

    One more question i have that when car is on CNG should its fuel pump keep on running or there is some mechanism which should cut its supply off so the fuel pump is not running all the time even when car is on CNG.


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    For cng conversion, different cars have different settings. You may get it set to your desired state from a cng wala.
    For rpm drop.issue, get your car throttle body checked and serviced if needed. Prob must go away. Get your air filter checked too.

    There is nothing seriously wrong. Your car just requires simple check and tune up

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    Thanks @Haroon_Tarar for responding. Will surely contact CNG mechanic for that. Thanks for easing out my worries....

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    Quote Originally Posted by qadir12345 View Post
    I have recently got a civic 03 A/T. Strange behavior which i face is that when it is started cold, it starts on petrol and immediately shifts to CNG causing engine to stall. Then takes 2-3 tries to start on CNG. Next issue is that it idles smooth around 1000/1100 rpm at P or N but when put in D its rpms drop immediately to a point where it seems as no rpm are there on odo. Also gives high vibrations at this point but still runs. Moreover, when AC is switched ON idle rpm slightly reduce but do not increase as used to be in my previous carby ride.

    My questions are

    1. is it normal to start like this for a CNG converted civic? Shouldnt it shift to CNG when accelerator is pressed to increase rpm to some limit ?

    2. is it normal for rpm to drop when putting car in gear as load increases? Shouldnt ECU compensate this load and increase rpm ?

    3. is it normal for rpm to drop when AC is switched ON as load increases? Shouldnt ECU compensate this load and increase rpm ?

    It is my first experience with EFI car so trying to learn it and need support from all Pakwheelers and specially from @Xulfiqar who has always guided me as well as others in past.... @irfan44 your comments too plz.

    One more question i have that when car is on CNG should its fuel pump keep on running or there is some mechanism which should cut its supply off so the fuel pump is not running all the time even when car is on CNG.
    1-It is not normal,it should convert on cng when rpm reaches at 1700,and this fuel overlap time is adjustable.Any good cng technician can adjust it.
    2-It is normal on cng.
    3-It is not normal,get the IAC valve cleaned as it is not functioning.

    Emulator cut off fuel injector only when vehicle operated on cng and fuel pump remain in working condition,therefore,it is recommended that fuel tank should be kept always quarterly filled to prevent fuel pump from burning.You can stop the fuel pump by installing a relay while vehicle running on cng,but it is not recommended for some reasons.
    Never loose hope in life,every step gives u something.

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    @argtr65 Sir if IACV is not functioning shouldnt it trigger CEL....? I have no CEL ON ....

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    I have one more question here.... Does EFI cars also need air blockage or venturies for CNG setup...? Two days back i saw air inlet of my car almost 70% blocked which i removed.

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    Quote Originally Posted by qadir12345 View Post
    I have recently got a civic 03 A/T. Strange behavior which i face is that when it is started cold, it starts on petrol and immediately shifts to CNG causing engine to stall. Then takes 2-3 tries to start on CNG. Next issue is that it idles smooth around 1000/1100 rpm at P or N but when put in D its rpms drop immediately to a point where it seems as no rpm are there on odo. Also gives high vibrations at this point but still runs. Moreover, when AC is switched ON idle rpm slightly reduce but do not increase as used to be in my previous carby ride.

    My questions are

    1. is it normal to start like this for a CNG converted civic? Shouldnt it shift to CNG when accelerator is pressed to increase rpm to some limit ?

    2. is it normal for rpm to drop when putting car in gear as load increases? Shouldnt ECU compensate this load and increase rpm ?

    3. is it normal for rpm to drop when AC is switched ON as load increases? Shouldnt ECU compensate this load and increase rpm ?

    It is my first experience with EFI car so trying to learn it and need support from all Pakwheelers and specially from @Xulfiqar who has always guided me as well as others in past.... @irfan44 your comments too plz.

    One more question i have that when car is on CNG should its fuel pump keep on running or there is some mechanism which should cut its supply off so the fuel pump is not running all the time even when car is on CNG.
    - ideally idle rpms should be 850
    - there is very minor adjustment to set petrol to cng conversion rpm
    - any load like ac, head light, power steering, etc decreases rpm and idle control valve is supposed to bring it back to 850 ... it doesn't mean ur icv is not working but sometimes you have to reset it .. slightly tricky job
    - the air blockage is essential but the amount of blockage has to be adjusted with some hit and trial method to get max efficiency and performance .. i used to do that with insulation tape since at high rpm it slightly bends and gives more room for air flow (just my own perception)
    "You have not lived today until you have done something for someone who can never repay you."

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    My civic starts up idling at 1.2-1.3 and comes down to 0.8 in about 5 minutes.

    Since you are using a honda automatic on cng, u must make sure your vacum lines are clean and working. Your engine is waming up properly and there is no tempering with the cooling system.

    Have the routine maintenance done like cleaning plugs gapping, tappets and throttle body service. CNG conversion timing can be reprogrammed using the cng switch. i think i posted a diy once, it was available at landi renzo website. its a simple procedure.

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    Quote Originally Posted by qadir12345 View Post
    @argtr65 Sir if IACV is not functioning shouldnt it trigger CEL....? I have no CEL ON ....
    No,it is not necessary.
    Never loose hope in life,every step gives u something.

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    First of all get routine maintenance done.
    Check ur ATF, when was it last changed. Is it of proper specifications
    Get TB serviced
    Get ur IACV cleaned
    Get the CNG conversion switch programmed. U can do it urself
    & lastly u can get ur car to run on CNG without the airblock. It's a little tricky but I luv my car's response without the block. I get good mileage on CNG as well as petrol



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