Question about 1988 Honda Prelude

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Black smoke greetings, have a 1988 honda prelude . having problem with fuel system, smokes alots. bad carburation. also have ck engine light is on

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  • Dale Barrett
    Dale Barrett Feb 15, 2009

    I have a similar problem. I have worked on cars for a long time and agree that the rich fuel problem is the black smoke and light color smoke is oil or water issue. It would seem that my prelude has an issue with the choke sticking when cold. I have not had the time to find a fix for my car yet. First let me say that my car has side draft dual carb setup not the fuel injection. I have checked the hoses and they dont seem to have any cracks or breaks. What part of the carbs actuate the choke pulloff at startup? Whats the fix. Thanks...

  • Dale Barrett
    Dale Barrett May 11, 2010

    Thats what I said. I would like to know if someone has come across a solution to the problem of a sticking choke problem on the older Preludes with dual carbs.... Thanks....

  • angelsart248 May 11, 2010

    OH... duh! lol

    Black smoke is usually oil burning... not good! Is it possible that you recently put too much oil in during an oil change or something like that?? If that is the case it should burn itself off.

    Fuel smoke is generally blue or white (like ever gunned it and had a puff of white smoke come out?) so not sure the two are related??


  • angelsart248 May 11, 2010

    what color is the smoke?


  • Anonymous Mar 23, 2014

    engine check light is on. black smoke emmission and high fuel comsuption rate



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I have to disagree with diagnosis, sorry. Black smoke is rich mixture of fuel, & blue/white is oil and/or coolant .

Posted on Jan 30, 2009

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It appears that there is an issue with the carbs on the earlier model preludes that can cause this problem. Like the old Fords with the Holley or FoMoCo carbs there is a power valve (or similar valve) on the Honda Carbs. If one of these valves goes bad the car will run rich all of the time and really rich (black smoke) when you first start the car. This was explained to me by a Honda Tech I know at a dealership. The valve may or may not be bad but may not be receiving vac from the hoses correctly. I have not repaired mine yet but I will investigate it further and report back.

Posted on Apr 11, 2009


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Black smoke from exhaust

hi nishga
im dave; hope i can help

First you need to determine if it is actually black smoke or if it is blue smoke. There are three colors of smoke that can come from the tailpipe. It is not white smoke obviously because that is easily differentiated from blue or black and generally indicates water or antifreeze leaking past the head gasket and into the compression area of the motor. White smoke is the steam of the water/antifreeze being emitted

Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with white smoke, just a small drop of oil leaking into the cylinder can produce blue smoke out the tailpipe. Blue smoke is more likely in older or higher mileage vehicles than newer cars with fewer miles. The car has many seals, gaskets, and o-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plugs, it will cause a misfire(engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.

Black smoke is caused by excess fuel that has entered the cylinder area and cannot be completely burned. Another term for excess fuel is "running rich". Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a heavy fuel odour in the engine compartment. Some of the causes of excess fuel are a carburetor that is out of adjustment which is not likely unless you have installed an aftermarket carburated system on your non-carburated car, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or emissions sensor. If black smoke is present, check the engine oil to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Check the above mentioned systems and after detecting the trouble replace the faulty parts and then the engine oil and filter.

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