Question about 2005 Ford F 350 Super Duty

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Blows black smoke when running 2600 rpm and boost goes down

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  • johncausey May 29, 2010

    2005 f250 6.0 diesal

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The boost falling off is one reason contributing to the black smoke. lack smoke is excessive fueland when the fuel isn't burning efficiently,the turbo isn't boosting.Two things to give thought. 1) Is your air cleaner dirty? (2) When was the overhead last adjusted? Ifyou have a pyrometer, you can better read what the engine is doing by the exhaust temp;
Remember, the exhaust is what drives the turbo and in tyrn, the turbo provides ample air for combustion.
It is one of two things you as the driver may be doing. Too high in gear causing lugging, and Trying to get it to go by pooring the fuel to it under load. Refer to the owners manual for the max horses @ RPM. This rpm is where you want to keep it, less 100 is ok. You want to kep the turbo haulingA**. Downshift if the Rpms sdrop off on the pull. See if any of this helps. In the 70's it didn't take much to get any diesel smoking. Even at higher rpms, if you pour the fuel to an air starved engine, you have smoke. Good Luck.

Posted on May 29, 2010

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I assume its the 6.0L diesel...If so sigh......double sigh.. I had one of these...triple sigh. I need a bit more clarification. How many km on the engine/vehicle. Also, you say that it blows black smoke while running at a constant speed at 2600 rpm, or while you are accelerating to 2600 rpm. Also, when you say the boost goes down, does it decrease by itself, or when the throttle is let off. The boost naturally goes down when the throttle is released (not trying to be a ****, i dont know how much you know). However, if the boost is going down by itself, while the engine is under load (its not supposed to, it should stay constant) it could be a couple of things, which "can" contribute to black smoke. If there is a leak anywhere from the turbo to the intake of the engine, it will cause the engine to get less boost, which means less air into the cylinders, which means black smoke. Check all of the connectors/tubing coming from the turbo to the intercooler, and from the intercooler to the intake manifold and see if there are any problems. The more costly problems which results in boost going down, and black smoke, deals with a problem with the wastegate on the turbo (controls how much boost is produced, and when too much is being made, it will bleed off excess pressure). So if your wastegate is malfunctioning, your boost will go down and you will get black smoke cause the engine is not getting enough air. also, around 160km...80mi, the injectors "can" start to go on the 6.0L diesels....I would check the turbo for leaks, the tubing for leaks, and the intercooler for leaks (a big rock can punch a hole in radiators and intercoolers...intercooler will be in front of the radiator). I hope this helps

Posted on May 29, 2010

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