Question about 1994 Ford Bronco

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Running rich, rough idle, flooding, heavy carbon exaust

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  • 343 Answers

Sounds like you may need a valve adjustment or valve job due to worn guides,seals. check compression. Could be different sensors on motor, pay for computer diagnostic or check individually. is mass air flow sensor and throtle body clean?

Posted on Oct 04, 2010

  • 2 more comments 
  • stonemanrock Oct 04, 2010

    there is no maf sensor 1994 OBD1

  • stonemanrock Oct 04, 2010

    im thinking new plugs cap and rotor ,wires. IAC sensor stuck?

  • Michael Kent
    Michael Kent Oct 04, 2010

    Its the flooding that throws me, way way too much gas, I assume V-6 w/ throttle body injection ( possibly an injector leak in the throttle body housing) or muti-port? Sounds like you've got a pretty good handle on it, hit me up if you need anymore input...

  • Michael Kent
    Michael Kent Oct 04, 2010

    something happened and my last response didn't post. If throttle body injection, check for leaks in throttle body, sounds like you have way too much gas getting in for a sensor or tune up fix

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Replace timing belts crank sensor runs rough at idle an exaust gets cherry red


This could be several things. One is obstructed CAT. The most common cause though is the engine is running so rich it is dumping unburned fuel into the exhaust. This could be a bad injector sticking exhaust valve, constant misfire etc. Don't run it like this or you will end up with a pile of charcoal and steel where your car is supposed to be.

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Bad carb or fuel injection issues- the system is fuel rich (black smoke) and also fuel rich system can make the idle low. Many things can cause this but thses are just a few.

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I have a 92 blazer 4.3 vortec


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. 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 fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example 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. Call your mechanic and advise him of what you have found.

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Mar 04, 2012 | Cars & Trucks

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I have a 92 blazer 4.3 vortec


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. 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 fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example 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. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

Mar 04, 2012 | Cars & Trucks

1 Answer

I have a 92 blazer 4.3 vortec


Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. 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 fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example 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. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Mar 04, 2012 | Cars & Trucks

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Black smoke>fuel consumption>rough idle


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. 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 fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example 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. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Mar 04, 2012 | Cars & Trucks

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328 gts 1986 very rough idle, running rich you can smell the gas from the exhaust . runs fine once the throttle is pressed


you need to adjust your idle screw on your carb i could tell ya how on that type of car but your running to high of an idle and flooding your cylinders thats y it is idleing rough and you can smell the gas, adjust your idle screw back a little and then you might want to check your plugs and make sure you didnt fowl and of them with it running rich

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My 87 wrangler runs rich, idles rough, runs rough. guy put on an electric fuel pump. original carb. he said it needed a fuel pressure regulator. is he right?


sounds like it is flooding the carb, by putting a fuel pressure reg on it it will lower the pressure at the carb and stop overriding the float,needle and seat.

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