Question about Chevrolet 3500

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1986 GMC 3500 blowing black exhaust smoke

350 gas engine started blowing black smoke from exhaust but does not burn oil. Could it be fuel mixture?

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  • Stephen Apr 25, 2014

    wore out the 454, it now has a bored out 350 with Elderbrock Highrise and Elderbrock 750 Carb. Keep adjusting the carb but seems to go back, might need a rebuild.

  • jim Apr 25, 2014

    check Timing and Spark plug Gap, do you have MSD? if so check MSD on line to see what plug gap should be opening helps, but carb is rich too, could be float, jet,

  • jim Apr 25, 2014

    http://www.youtube.com/watch?v=hoXK9tm0b...

  • Stephen Apr 25, 2014

    I'll do that, Thanks.

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Black smoke is fuel, is it a 454? 86 has Carburetor? replace its

if its diesel it Is rich fuel as well,

Posted on Apr 25, 2014

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  • 42 Answers

Yes

Posted on Apr 19, 2014

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SOURCE: White smoke exhaust

White smoke is caused by coolant or water coming out the tail pipe. There is a chance that the white smoke was caused by water splashing up from a puddle onto the exhaust pipe. Keep an eye on the coolant level in the radiator in any event. If its less then there leak coolant leak in the car engine which is causing this problem....

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SOURCE: freelander td4 engine smoking through the exhaust

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SOURCE: i have black smoke blowing out the exhaust wen i step on the gas

I own a 2004 F-350 with the 6.0 Turbo Deisel...My wife has been driving it periodicll arround town and had mentioned from time to time it seemed to not want to get going. Well yesterday I went and picked the boat up and on my way home the truck lost all power and was spewing black smoke. After reading a few blogs I decided to pull the EGR Valve.. It sits right on top of the engine (from the front bumper looking at the engine) just forward and to the left of the oil filter. Two 8mm bolts and it comes off ( rotate back and forth while pulling up). The EGR valve was covered in soot and partialy in the open position..no matter how far I manually opened the valve it stayed in that position.. After checking the price of a new EGR ., I decided a little home remedy was in need.. I let the valve portion of the EGR ( the lower porting, NOT THE ACTUATING PORTION) soak in fuel over nite. Cleaned the soot off and lubricated the valve shaft. Actuated the valve manualy an few times and it began to spring closed beautifully..A tad more touch up cleaning..reinstalled the valve and was able to hear a feel a noticeble difference in the way the turbo spooled up... no black smoke .. and running smoother... Quick fix..easy fix.. so easy I plan to make this part of my oil change ritual... pull the valve .. clean and lube... HOPE THIS HELPS ! !

Posted on Apr 24, 2010

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Motor is smoking in my '02 diamante, is it the gasket?


Smoke diagnostic is made by colour.
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When first started black smoke comes out exhaust pipe,, what could this be


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Thanks. Keep updated for any more query. You can rate this solution and show your appreciation

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What would cause smoke to come out the exhaust pipe


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Black smoke means fuel runs rich (car getting to much gas). Check fuel pressure/air filter.
In some cases the white smoke means car is burning oil or transmittion fluid. Have tem checked/replaced.
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In a worsest scenario if car blowing white smoke it can be engine coolant is getting into an engine cylinder from a bad head gasket ,or a warped/cracked head. So you need to keep your eye on coolant level and check your engine for overheat. Also might be good to check your oil for traces of coolant (on a dipstick it would be a milky substance mixture of oil and coolant).
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Black smoke from exhaust


hi nishga
im dave; hope i can help

First you need to determine if it is actually black smoke or if it is blue smoke. There are three colors of smoke that can come from the tailpipe. It is not white smoke obviously because that is easily differentiated from blue or black and generally indicates water or antifreeze leaking past the head gasket and into the compression area of the motor. White smoke is the steam of the water/antifreeze being emitted

Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with white smoke, just a small drop of oil leaking into the cylinder can produce blue smoke out the tailpipe. Blue smoke is more likely in older or higher mileage vehicles than newer cars with fewer miles. The car has many seals, gaskets, and o-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plugs, it will cause a misfire(engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.

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