Question about 1993 Ford F150 SuperCab
Black exhaust smoke means the engine is burning too much fuel. The first think you should check is your air-filter and other intake components like sensors, fuel injectors and the fuel-pressure regulator. Other reasons could be a clogged fuel return line. Black smoke is usually the easiest issue to diagnose and fix, but burning unnecessary fuel will definitely affect your fuel economy, so don't think of avoiding this one to save money, it won't work.
Any smoke coming from your car's exhaust pipe is a sign that your car is in distress. Pay attention to what it needs to ensure more miles for your vehicle.
Posted on Apr 12, 2014
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Posted on Jan 02, 2017
Sounds like its flooding(excess fuel)Try squeezing the main fuel line enough to allow enough fuel through for engine to run smoothly if that improves running of engine either fuel pump needs replacement or pressure relief valve has failed or has no vacuum to activate it.Dirty or failing injectors can also cause your problem,try putting a can/bottle of injector cleaner in fuel tank to see if it improves running of engine.Air flow meter can also be an issue.A few potential reasons foryour problem and too hard to lock it down to a single cause without the vehicle being in front of me to do the appropriate tests so have just provided the basic causes and hope your able to take it from here and solve the problem.Good luck
Posted on Dec 26, 2008
are you losing coolant? ford had a huge problem with that engine,and the coolant eats the main bearings.
the defect is in the EGR valve setup.
check with ford,they are aware of the issue,there are thousands of them
Posted on Sep 01, 2009
thats a HUGE engine and will **** a ton of gas!!! but if ts using more than normal,along with theblack smoke,tells me you have some valves with alot of carbon buid up on them.you can spend 100s removing the heads and sericing the engine....but i would warm up the engine...have a friend give it some gas to keep the RPMs up while you SLOWELY pour a ite stream of water into th carb. it will spit and sputter while you do this,dont be scared...tats normal,then have your friend rev the engine while you do a bit more. while you do this,you will see a ton of black smoke out the exhaust. what your doing is heating up the valves,and when water hits thm, it busts that build up off,and it burns giving you some black smoke. continue to do this till the smoke changes color,and then you will have fixed it. its a trick i used years ago...and never failed!!!
Posted on May 01, 2010
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