Question about 1993 Lexus Es 300

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Smoking from the tailpipe due to excessive fuel burning

The check engine light is always on and smokes from the tail pipe smells of gas. what's the problem

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  • wnjau Jun 13, 2009

    I did put two used 02 sinsors just to see the outcome and the check engine light disappeared but the 1993 lexus still smoke gas fumes from the tail pipes. I took out the spark plugs and the three front spark plugs are the ones I found to have gas on them

  • wnjau Jun 13, 2009

    No, this is not head gasket problem, I can see the smoke from the pipe is heavily rich in gas plus three front spark plugs have gas in them when I took them out

  • wnjau Jun 13, 2009

    I put new spark plugs and they are all tight and the problem still exists

  • wnjau Jun 14, 2009

    the engine light is not on now. it disappeared after I put two used 02 sensors.Where is the fuel pressure regulator located on this car. Can the injectors cause this kind of problem of emitting smoke rich in gas from the tailpipe

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This gas smell that you are getting from the exhaust is the result of your engine running too rich. It is time for a complete tuneup. Since your check engine light is on I would take it into autozone and have them scan it for free. This will tell you what made the computer turn the light on in the first place. It could also be a bad oxygen sensor that is causing the engine exhaust to smell like gas and running rich. Now that I think about it a little more it makes the most sense. When the sensors go bad the engine will run really rich and it will also make the check engine light on. I would definately go get your car scanned before I do anything else that way you know exactly what is going on in the engine control system. This is also causing you to burn a lot more gas as well so when you get this problem taken care of you will be spending less money on gas. Part of a COMPLETE tune up is to replace the oxygen sensors.

Posted on Jun 15, 2009

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If the Check Engine light is on and the engine isn't burning up all the gas that's going through. I would say you need an EGR valve. Or (Exhaust Gas Recirculation Valve) I would take the car to Autozone or Advanced Auto and get a printout of the Engine Diagnostic to be sure. But that sounds like your problem.

Posted on Jun 14, 2009

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Hi,

Check your engine for a blown head gasket. The white smoke is probably coolant.


Any further help, let me know.


Thanks for using 'Fixya".

Posted on Jun 13, 2009

  • taran_2005
    taran_2005 Jun 13, 2009

    Hi,

    Before we check any other element, check :-

    1. Spark plugs might be at fault.

    2. Loose spark plugs - It seems a bit tricky and awkward but sometimes due to loose spark plugs, you might get gas in the exhaust smoke than fumes..

    Check and let me know.

    Thanks.


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1 Answer

Limited. Why would it be smoking after replacing one plug?


what smokes. we are blind here.
you must stay.

1: end of tail pipe smokes
2: or, with hood up the exhaust manifold smokes due to oil we dropped there. (common on much service)
and what color is it.?
from where.?
tail pipe can do 3 colors
white goes away fast ,called steam.
white stays way too long called burned oil smoke,
and black (unburned fuel) and smells like gas..

Mar 30, 2016 | 2004 Jeep Grand Cherokee

1 Answer

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


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

2 Answers

I have a 2001 ford ranger and white smoke is coming from my tailpipe that smells like gas


your tail pipe is always going to smell like gas the white smoke is oil being burned from worn out valve guides or rings.

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I've changed the oxygen sensor and the O2 sensor and new plugs on my 97 dondge 3.9 van and it still blowen black smoke (rich) seems to run real good on top end but theres is a flat spot where theres no...


Black smoke indicates no air, check your air filter, if you have done that and it is ok, check the PCV valve. Thats about all that I can suggest. Hope that helps.

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1 Answer

My 92 ford is using excessive gas and has a bad gas smell with alot of smoke coming from tailpipe after i add gas


If the smoke comming from the tail pipe is black your running rich. If thats the case the entire fuel system has to be ckecked out. Injectors could be leaking, a bad pressure regulator,stuck return line ,a coolant temp sensor could be telling the ECU that the engines cold give her more gas. I don't recommend doing fuel service unless your qualified to do so for the obvious reasons.
If the smoke coming out of the tail is grayish you have a bad head gasket. If the smoke coming out of the tail is blue you have engine oil getting into the combustion chamber. keep me posted

Mar 08, 2010 | 1992 Ford Explorer

1 Answer

Why do i get black smoke when i boot it hard out of the exhaust


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

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

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