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Thread: Honda City 2004 Black smoke in morning.

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    jrajput's Avatar
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    Default Honda City 2004 Black smoke in morning.

    My city 2004 gives black smoke in the morning very often nowadays with oil particles coming out of the exhaust pipe too; it stops when the car has fully warmed-up. It's driven 115,000 Km on petrol throughout (no cng installed) on the same engine that came on delivery. The Oil level remains the same and i use Shell Helix HX5, changing it around 4,000 Km mileage on average.

    During the weekdays, I only drive it to and from office i.e. i start the engine at 8.30 am in morning where i reach my office in 1 hour and then it stands cold in the parking throughout the day until 5 pm when i get off and head back to my home. I have to warm the engine up a little (like 3 to 5 mins) nowadays as compared to earlier where i used to start my car and just drive (i.e. didn't had to wait warming up the car this long, although i used to still warm it up for about 1 min or earlier). Otherwise the engine is great i.e. no other symptoms noticed. If i drive the car without warming up nowadays, the vario gear gives sound with improper, cold acceleration and it doesn't feels fine so i rather warm it up for a few mins before driving.

    Any suggestions/advice as to what might be causing the black smoke out every morning? Is my engine meeting its life expectancy? Please also suggest how can i get it checked for the problem you identify. Thank you

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    imranasim's Avatar
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    valve seals are worn out probably wait for experts.

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    Can not say anything may be just because of cold weather

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    Are u sure it's black. Not grey. Can smell anything when it's smoking.
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    if you are in islamabad then it might be because of cold weather but in karachi this thing ain't reasonable. Take your car to Honda Service centre and get its compression and engine checked. If all is fine then probably it needs complete engine tuning and use better oil, shell oils are not so good shift to zic lm or mobil. And use proper engine oil as recommended by manufacturer.

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    Quote Originally Posted by imranasim View Post
    valve seals are worn out probably wait for experts.
    Bad valve seals will cause excessive oil consumption. If the valve seals have deteriorated enough, the blue-white exhaust smoke will last longer after start-up and acceleration. Yet the smoke will eventually disappear after long engine operation or during periods of hot weather. Bad valve seals nearly always show an intermittent problem of oil burning, whereas worn piston rings and valve guides will smoke during all times of engine operation and never disappear.

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    Black smoke results when a rich mixture (More Gasoline) burns improperly(incomplete combustion). I think that in ur case when engine is cold the fuel is not completely vaporized in the cylinder due to cold temperature (a strong ignition flame is required to burn this cold mixture, which I think is missing in ur case) and therefore incomplete combustion results producing a black smoke. But when the car warms up the cylinder temperature rises and fuel is properly vaporized and mixed with air resulting in a more complete combustion.


    Now this may be due to a weak ignition spark (weak spark plugs), or insufficient air (clogged air filter).

    Did u replace any one of these when the problem started?

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    Well my khyber was doing the same. Got the carburetor serviced and voila no black smoke any more Might wanna get that serviced first. Cost me Rs 500/-

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    MAP/MAF, O2 sensors are the one in direct relation to it. check your plug color
    93 Accord CB7 (Sold) / 2005 CL7

  10. 02-02-2014, 06:33 PM

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