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8 year old oil fired boiler with horizontal exhaust pipe and blower, new filter, nossle and cleaned every year, recently started blowing black smoke and odor from front inspection port when first turns on.

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Hello Change the ignition TRANSFORMER on the burner.

Posted on Sep 13, 2010

Testimonial: "Changed the transformer per your suggestion and it has been working great since then. Thanks for the help."

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is this a hot air system ??? if so does this problem occur when blower comes on if so heat exchanger is cracked.

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Black smoke from 2000 Avalon


I can change my oil every 3 decades and it'll be at regular intervals. What are your intervals? 3000 miles? 84 million Mississippi? One lap around Daytona Raceway?

Where do you see the black smoke and carbon coming from?

A mechanic that "forgot" to change the oil filter is not only a poor mechanic, but he/she is ripping you off. You need an oil filter with each oil change more than you need new oil. If I poured clean water through a dirty Brita filter, would you drink it?

There is no way to tell you exactly what's wrong over the internet (besides your mechanic). But, assuming the smoke and carbon you mentioned is coming from...

the HOOD: You either have an oil leak, or just a bunch of oil sitting on your engine burning off. Check oil with dipstick (something you should be doing at least once a week in a NEW car, let alone a 10year old model.) The leak could be poor workmanship by your mechanic, or something entirely different, too.

the EXHAUST PIPE: You may have blown your piston rings or have a stuck/bent valve.

Toyotas are somewhat known for running well beyond when they should. I blew out rings in my '93 pickup and drove it daily for 3 more months before it actually quit. I'm still not convinced it's dead.

Oct 19, 2012 | 2001 Toyota Avalon

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If your after market turbo is blowing oil into the engine, best you have it removed. When you say that fuel may be leaking into the cylinders, it could be leaking fuel injectors. If the smoke out of the tail pipe, it's usually indicator of burning coolant. Blue smoke is indicator of fuel and black of oil.

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I installed a set of used cobra pipes on my 2006 vtx 1300. I should say now it hasn't been ridden in 2 yrs, just started occassionally. I started it up one day and white smoke started billowing out of the...


It seems the fuel has flooded through the carbs from sitting. it may need the carbs cleaned and new fuel in the tank, and a new air filter element, there is also a possibility fuel has made its way into the sump, so check the oil level, or change the oil if it is 2 years old.
This can all be caused by a leaking fuel tap, and the fuel getting old and leaving a residue in the tap and carbs

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Black smoke coming from a 250 GM inline 6 exhaust pipe, then ran rough and now has quit and will not start


you don't say what year, if it has a carburetor it's flooding (Needs a new float) Way too rich

remember this
Blue smoke OIL
black smoke GAS

Aug 30, 2009 | 1983 GMC Jimmy

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I have a yardman lawn mower that is two years old. It is now blowing oil out the exhaust and also blue smoke. Any idea what is wrong?

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Black smoke on start up


Do a motor flush before the next oil change.
This will free up the rings and regain some of the lose compression.

If it's the org. engine it will has over 90,000 miles on it.

Did you do the 75,000 timing belt change?

It's normal to has the valve stem seal/oil seal on the head to leak oil into the cyclinder.

The smoke you see is the motor oil drop from the seals.

It land on the top of the cyclinders and it create black smoke at start up.

The inexpensive fix is to start using high mileage oil with seal conditioner.
This will help soften the rubber seals and help reduce internal oil leak.

The correct fix is to wait until it's time for a head gasket replacement and let the professional service the head.

Complete head service is the only method to stop this internal oil drip problem.

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1 Answer

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Black smoke should not be coming from your air filter. If however, the smoke is coming from your exhaust this could be the result of dirt clogging your air filter and starving the engine of air, hence causing the motor to run on a rich fuel/air mix. If this is the case clean or replace the air filter element, and keep it clean. Another reason for black smoke blowing out is dirty oil in the crank case, if the oil is very dark brown to black in color or smells burnt then it needs replacing.

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Change your air filter and clean the blow by tube that crosses the heads and connects to the back side of the air filter. If the tube or the air filter is clogged, then the oil that the blow by removes is going back into the cylinders, causing the black smoke. Also keep in mind that a Harley will blow a little black smoke upon starting as it ages, it's normal.

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