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What causes blackness of plugs - Cars & Trucks

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To much fuel in the cylinder (AKA rich mixture).

Posted on Dec 30, 2016

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Posted on Jan 02, 2017

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I am driving bmw 520i 1992 model,all 6spark plugs are black,what causes that?


Many possibilities. Does it run well? Idle well? Tail pipe black too? 1st, coolant temp sensor bad. Also weak spark (coil/module), leaky cold start injector, bad valve guide seals, clogged exhaust/converter, bad O2 sensor.

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#2 spark plug black all others clean


The spark plug is fouled. Without seeing it, its hard to tell from what. With a heavy black coating, this sounds like it is getting fouled by oil. This can be caused by poor oil control due to worn piston rings, or it can be caused by leaky valve seals.

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Will a leaking manifold cause black smoke & black


by all means the answer is yes. the 02 sensors will pick up this leak and fatten up the injectors(more fuel) due to raw air coming in to the exhaust.

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Spark plugs is soot black and there's a check engine msg after oil spilled on the engine when i forgot to cover cyclinder head oil cover


the black soot may be old plug wires that should be replaced chances are the spilled oil caused the engine to miss fire setting off the check engine check the inside of the plug boots and plugs for oil.

Feb 21, 2011 | 1996 Toyota Corolla

1 Answer

There is a black smoke coming of the exaust? and it is shaking too much when it is on


a bad fuel pressure regulator causes this. black soot on plugs, black smoke from tailpipe, running rough, stalling. first check plugs and wires.

Jul 01, 2010 | 1993 Oldsmobile Cutlass Supreme

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Miss firing engine and black spark plug


Is it a two stroke machine , do you mix your own fuel.

If so over dosing on the oil component will cause your problem, check for the right mix levels and follow them.

Is the choke going full back to zero ?

Are you running the right type pf plug for that engine, some run hot some dont

Is the engine running smooth or lumpy.
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For a four stroke engine

Your engine may either be running very rich or there is wear on the bores causing oil to get to the electrode.

You can obtain a spark plug extender which takes the plug out of the direct line of fire

May 24, 2009 | 1997 Acura CL

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The plugs keep getin black and the car givin off black smok


you never said if it was oil on plugs or just black soot two faults if its oil engine may need replaced if its black soot chances are your fuel mixture is to rich this would cause the car to have a heavy fuel consumption hope i have helped you

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1 Answer

1987 Dakota plugs


Check your 02 sensors and be sure that the air filter is clean. You also may be having trouble with the fuel pressure regulator.

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