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Thread: burning smell of petrol at idle

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    Default burning smell of petrol at idle

    aoa members . honda city 1999 efi.i m experiencing unburned fuel smell in garage when idles the car ...smell is sometime very dark and smelling the silencer let the tears shed from eyes... someone also fiddled with trim pot ..it was first at 2.33v(x431 scanning device) mechanic adjusted it to 1.8v then sencond mechanic adjusted it to 2.5 ... i can feel the diference of 19,20 after 2.5v but not more than 20 %... i cant understand what is the problem ... plugs are new and i insulate the cable wires with double taping (black tennis ball tape and carton packing tape).

    kindly give some right direction


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    Could be a malfunctioning/fouled sensor in the throttle body. No?
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    Quote Originally Posted by Xulfiqar View Post
    remove the fuel pressure regulator vacuum pipe and watch for fuel in it (you will have to wait for a minute or so to actually see it) - if you dont then switch off the engine and smell it - if it smells like raw fuel you need to replace it.

    If you see liquid fuel in the little vacuum pipe connection - you need to replace the regulator.
    I tested it for 1 minute when i unplugged it then rpm increased and no sign of fuel and i didnt smell fuel

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    @Xulfiqar i think i have to work with trim pot...can u plz guide me how to do it without analyzer as ..mechanic dnt have it here in faisalabad

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    Quote Originally Posted by searchingeyez View Post
    I tested it for 1 minute when i unplugged it then rpm increased and no sign of fuel and i didnt smell fuel
    you have to block the vacuum pipe with your finger - the rpm increase was due to the air leak that you just had created.
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    Quote Originally Posted by Proverbial_Slang View Post
    Could be a malfunctioning/fouled sensor in the throttle body. No?
    could be a really bad MAP sensor - but just not bad enough to cause a check light.
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    Quote Originally Posted by searchingeyez View Post
    @Xulfiqar i think i have to work with trim pot...can u plz guide me how to do it without analyzer as ..mechanic dnt have it here in faisalabad
    the trim pot is set to 2.6V or near that. it is tested by an exhaust analyzer however please do tell what vacuum reading did you see when you connected the scan unit - the technician can plot a screen on the unit to show a cluster of information like vacuum, eng temperature, throttle angle, fuel trim, or any other piece of information too. What were the injector duty cycle when you tested?
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    Quote Originally Posted by Xulfiqar View Post
    the trim pot is set to 2.6V or near that. it is tested by an exhaust analyzer however please do tell what vacuum reading did you see when you connected the scan unit - the technician can plot a screen on the unit to show a cluster of information like vacuum, eng temperature, throttle angle, fuel trim, or any other piece of information too. What were the injector duty cycle when you tested?
    sorry Xulfiqar i dont remember the exact reading ...but first reading of IMA(trim pot) was 2.33 v when mechanic said(oh i m changing it to 1.8v it will reduce petrol comsumption)..

    ect:88C
    injectors: dont remember exactly ,,,may be 3 ms
    map sensor idle : 33kpa

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