Question about 1987 Toyota 4Runner

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Carbon build up

Forgot why you get carbon on the spark plugs

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  • Anonymous Jan 11, 2009

    How do you fix the mix of the fuel

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  • Master
  • 1,990 Answers

You get Carbon Buildup on the Plugs when your Mixture is Running too Rich.

Posted on Jan 09, 2009

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keemo68
  • 1263 Answers

SOURCE: nissan maxima v 6

that sounds like you have a clogged exaust porton either the intake manifold or the exaust manifold.

Posted on Aug 30, 2008

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Inconsistent engine miss fire?


likely suspects:
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Spark knock carrying mail 1050 starts and stops on route 62 miles liong doesn't ever get over about 35mph


The spark plugs could have carbon build up on them. Driving a vehicle like this allows carbon to build up in the cylinders. You can try a higher octane fuel to see if that helps but you should also run a good fuel system cleaner like Chevron Techron or Valvoline Synpower through a tank of gas. If this doesn't work you'll have to do something more aggressive like run Sea Foam through the engine.

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Spark plugs on my 1992 4x4 sr5 4runner 6cyl 3.eng auto are covered in dry carbon why


Carbon build up comes from rich mixture or weak ignition. This will cause misfiring, hesitation and hard starting. To fix the problem, change the plugs and use a plug that will produce a higher heat range. Which means it has a hotter firing/ignition when combustion. This will burn the excess gas that causes the carbon. Be sure to check the plug wires to make sure you don't have spark jumping. (check at night with engine running). Also be sure the air filter is clean.

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Engin developes diesel knock followed by the engin management light comes on


Assuming the engine timing is'nt the problem; you may have a fouled spark plug, bad spark plug wire, or excessive carbon build-up on the valves and pistons etc. Make sure all fluid levels are where they should be. Try replacing the spark plugs and wires. Look in your operator's manual in the specs sections and make sure the spark plugs that are installed are gapped properly. Improperly gapped spark plugs or split-fire ( can't be gapped) spark plugs are known to cause engine issues. Make sure to use dielectric grease when connecting the spark plug boots to the spark plugs; and the wires to the distributor. Also run a couple bottles of fuel system or injector cleaner and water remover through several tanks of gas to remove any possible excessive carbon build-up. Hope this helps. God bless!

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sounds like valve guide seals are leaking allowing oil to enter the combustion chamber with is fouling the plugs with carbon build up.

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Running rough like timing is out


check for leaks around the intake manifold, vacuum hoses and engine breather system. Look for loose wires, check the plug leads. Check the valve lifters for clearances, or faults if hydraulic you should hear them rattling while the engine is idling.Look at the disi cap,rotor and the cap itself for dirt, damp or carbon build up.
I hope this helps

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Got carbon buid up on spark plugs


carbon build up comes from too much oil going into the cylinder and not being burned off. leak from a valve guide or oil bypassing the rings. is it on just one or all the plugs?

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2 Answers

Rough start and slow pickup/speed. Uses alot of fuel.


That's probably because you've got a lot of carbon build up in your engine's combustion chamber.

The best way would be to restore the power and speed would be to have a carbon ridding solution injected into the engine. The solution will liquify the carbon and other build-ups, which would then restore the "power" of your car. You'll get better acceleration, higher rpm and top speed, etc. have a mechanic do it for you. It's alot cheaper and faster than having the engined overhauled.

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