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Thread: Expert Opinion requested - 8th gen civic

  1. #1
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    Default Expert Opinion requested - 8th gen civic

    Hi guys,

    The car under discussion is my 8th gen manual civic. The car was working perfectly fine until our recent trip to the northern areas. i will narrate the issues faced and would request your feedback:

    On motorway, the car started puffing black smoke when pushed above 120km. Even on static position, one can see black smoke being emitted from the silencer.
    One particular thing that has been there since the purchase is smoke emitted from the oil filler cap which is quite significant. i have had the PCV valve cleaned (not replaced) but it hasnt helped muck. The car is not reducing water but did reduce some oil on our recent trip to the northern side (approximately 1200kms).

    We did conduct the compression test and the results were 175, 160, 160, 160.

    Where i seek your advice is:

    Is the compression alright for all the cylinders?
    Why is the smoke being emitted from the oil filler cap?
    There is some smell of petrol from the tail pipe if the car is sitting at idle?

    Please note that the car was scanned properly and there was no issue with any of the sensors. Mechanic was of the view that the engine is weak which i am not willing to buy as the car packs a lot of power and does not show any such signs?

    Xulfiqar, STR__GTR, capsat, would love to hear you guys specially. Everyone else is requested to spare few moments to share their views.
    Thanking you guys in anticipation.

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    Anyone?

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    Do u have any check engine light? It is normal for very slight oil reduction on a very long trip such as urs but very very slight..
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    According to the manual..compression readings for honda civic 8th gen R18 should be 125 +- 28 psi..So ur engine is on good compression imo..For me i wuld advise u to change ur PCV valve..As this is the first step and cheap as well to do if ur car is reducing oil..also check if u see oil on ur air filter..Post back what u find and I will help u from there onwards..
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    And what color is the smoke from the oil cap..If after uve driven it a lot and then remove the cap and see 'steam' thats normal..Any other color smoke isnt normal!
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    Self editted

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    Check for throttle padel output and match it with service manual

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    Also check MAF sensor for functioning right most Japanese car don't give check light with bad MAF

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    too much fuel getting through injectors, get them fuel injectors checked.

    "Black smoke coming out of the tailpipe on a vehicle with a gasoline engine is a sign of a rich fuel mixture (too much fuel, not enough air). A brief puff of black smoke may be visible during hard acceleration when the fuel mixture goes momentarily rich, but under normal driving conditions and idling the exhasut should be transparent. If black smoke is visible all the time and the inside of the tailpipe is coated with heavy black carbon deposits, it would tell you the engine has a rich fuel condition."

    "On a newer vehicle with fuel injection, black exhaust smoke can be caused by one or more leaky fuel injectors, too much fuel pressure (sticking fuel pressure regulator), a faulty MAF sensor or Oxygen sensor, or a engine computer fault."

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    according to this page it could also be worn out rings.

    My Engine Is Blowing Smoke! What Does It Mean? | Auto Advantage

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    Thank u guys for your opinion.
    Ziyad
    I insisted for 9th valve change but the mechanic said that it's perfect. Should have forced him into it.
    Injectors were cleaned and checked for leakage. None found. What I personally believe is the PCV valve to be the culprit as it can cause the air fuel ratio to be disturbed and hence the black smoke.
    Talk like is not black though as it has recently started.

    Others
    As sensors are functional and within the specified readings as per the last scan.

    Regards

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    Just to add that there is no oil on the air filter and not a single drop of water has been reduced.

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    The old method of checking pcv valve by shaking it and hearing a clicking noise is obsolete..U should definitely get it changed and buy an oem part from Honda3s..Also its not fairly common for pcv valves to gum up..u shuld ask ur mechanic to open up the tappet cover and look inside for any oil deposits on the internals of ur engine and use a good fully synthetic oil after u change ur pcv valvem.btw whats the odometer reading?
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    Car is 150K driven. Tappet cover was removed recently and the engine was all shiny with no deposits whatsoever.
    I will definitely get it changed and will flush the current oil as well.

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    Presumably the pipe connecting the PCV valve and thh intake manifold will have to be checked or replaced as well.

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    Is it fixed ?
    None of the brave deserve fair....

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