Question about 1993 Ford F150 SuperCab

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My 1988 jeep cherokee is blowing black smoke but not to heavy and a very rich fuel smell

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Cat converter may ? be plugged .... or the fuel system may be overloading .........

Posted on Apr 12, 2014

  • John Marsh
    John Marsh Apr 13, 2014

    yes about the cat convertor i saw that on line a couple days ago, and one injector looks wet on the plug on top of it. the other ones look clean, but not sure if its oil from something else, should probablr wipe it and see if it builds up maybe a bad injector? Would that cause the rough idleing. when i rev it, it sounds good.


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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

  • John Marsh
    John Marsh Apr 13, 2014

    also was told maybe a vaccuum leak< could that cause the rough idleing?



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Posted on Jan 02, 2017

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SOURCE: f-150 4.9 lt .once it starts, blowing heavy black smoke

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

  • 667 Answers

SOURCE: Ford Escort ZX2 Sport 1998 running too rich, heavy

check the MAP sensor and vaccum to the MAP sensor

Posted on Mar 20, 2009

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SOURCE: blows lots of black smoke if back fire knocking smell of fuel in

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

  • 189 Answers

SOURCE: 460 eng burns to much fuel and blows black smoke.

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 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

  • 3 Answers

SOURCE: 7.5 blowing black smoke

check fuel pressure regulater,map sensor &coolant sensor

Posted on Aug 27, 2012

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It blows black smoke wen i get on it real hard and it also does it wen i let it sit and idle it dies sometimes

Way too rich (pollution, horrible gas mileage and shortening the life of the engine by washing down the oil)...
Check carburettion.
Is this carburetted or injected?


Oct 16, 2009 | 1988 Jeep Cherokee

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Black smoke out of exghost

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Dec 09, 2008 | 1988 Jeep Cherokee

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I'm rich

Is there black smoke coming from the exhaust?
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Oct 17, 2008 | 1993 Jeep Cherokee Country

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