Question about 1987 Toyota 4Runner

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Got carbon buid up on spark plugs

What is the deal with carbon on the spark plugs

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  • yadayada
    yadayada May 11, 2010

    how are the tail pipe levels of CO and HC? does it use more than 1 quart of oil in 500 miles? How is the MPG? How many miles on the engine?

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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?

Posted on Mar 14, 2009

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How to replace the carbon on 94 geo tracker?


carbon (Slept 3 nights,(on vac 30 day)\
answer 1 wire at a time. or it cross fires.
my guess is you meant changing carbon core
HV spark wires, but the plug wells are like oil pits. (flooded) SUPER COMMON.

(not spark tips carbon-ed up. right)

http://www.fixkick.com/IGN_timing/tune-ups.html#SETS

get he MAG wires and win.! max life and better spark!!!

all G16b do this seen 100s and all C.O.P engines.
1 cause
owners did not do full 60k mile tuneup
per operators guide, lost it have it ask.
the valve lash step, demands a new valve cover gasket set.
if not it will fAIL, it will,like pissn on a sparkplug
bam. like texas talk, i do...sorry

and a cam belt.. forgot that too?
that is fail 2 , in the woods,
or like train light in the tunnel.

not one of those parts last the life of engine
the real reasons tuneups were invented
and why planes dont crash (of ddumbb things like this)

tuneups on this engine, only make long walk home
on other engines, most DOHC. boom head valves bent or far far worse.

if lost
firing order
is
1342

Dec 18, 2015 | 1994 Geo Tracker

1 Answer

What additives can be use to clean piston head with valve


A great deal is sprouted about additives that clean valves and pistons and heads but unfortunately there are none worth the money. Especially now that lead has been removed from the petrol as there is no contaminant that builds up in the combustion chamber. Plugs will indicate if rich or if there is an oil burning problem and the CPU does it's best to keep the air/fuel mixture exact to prevent problems.. If you know that there is a serious buid up then a head job is the answer.

Oct 24, 2013 | Kia Sorento Cars & Trucks

1 Answer

The porcelain spark plugs keep on cracking when the car is being used


Is the porcelain "cracking" or are they getting "carbon-tracked"? (see example photo of carbon-tracked plug below).
It is common for carbon-tracking to occur if your original plugs were carbon-tracked and you replace the plugs without replacing the wires. If the plug is carbon-tracked, the boots on the wires or the coil boots (coil-on-plug ignition) are also carbon-tracked. If you do not replace the wires or the coil boots, the ignition will still misfire by following the carbon-track on the inside of the boot. This will cause your new plugs to also be carbon-tracked within a short period of time (days or weeks).

There is no reason I can think of for the porcelain itself to actually crack other than faulty installation techniques or possibly, cold liquids getting poured on extremely hot plugs.


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May 11, 2012 | Buick LeSabre Cars & Trucks

1 Answer

Shows up on computer check number 2 spark plug missfire replaced spark plugs a few oil changes ago bucks while driving??


Replace spark plug as may be firing inconsistently allowing unburnt feul to buid up and ignite intermitently

Apr 29, 2011 | Ford Focus Cars & Trucks

1 Answer

1986 nissan truck v6 it has no spark.I was told the coil was replaced a year ago


Welcome to Fixya

Do a test for spark at the plugs. Remove one of the plug wires from a plug and hold it near grounded metal. (If the plug end has a long insulated shroud, you may have to improvise to get ground close enough to the end of the wire.) Have someone crank the engine while you watch for spark. If you get an 1/8" or so of spark, that should be enough to fire.Check the distributor cap inside for signs of cracks or carbon arc tracks.Also, check to see that the little carbon contact for the center terminal is in place; without that you can have spark but it won't get to any plug wires.It's rare, but a rotor with an internal short or carbon tracks on the surface can kill the spark before it even gets to the cap.

Thank you for using Fixya!

Mar 28, 2011 | 1987 Nissan Pickup

1 Answer

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.

Jul 06, 2010 | 1992 Toyota 4Runner

1 Answer

2001 Hyundai Accent, was having the same lacking and engine light flashing in low gears - and when it needed more power up a hill for instance - it would lag, bad than finally catch up. Got the timing...


The only way to deal with high compression due to carbon is with premium gas. You don't want to actually take the head off and clean it, because it is too expansive and not worth it. The carbon will burn off as long as you don't keep adding more from additional pre-ignition. And premium will stop that.

Mar 31, 2010 | Hyundai Motor 2002 Elantra

1 Answer

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!

Nov 03, 2009 | 2000 Ford Ranger SuperCab

3 Answers

Dead olds


basic tune up items could cause this as could depending on what motor coil packs.try spraying soapy water on plug wires see if they arc.

Aug 31, 2009 | 1989 Oldsmobile Delta 88

1 Answer

Engine seems to be missing


it sounds right, it is called a light load miss. it occurs mostly at 45-50 mph on slight incline and it feels like a bucking or hesitation. It commonly ocurs when there is carbon tracking on a spark plug porcelin (sp) . note . if the porcelin has carbon tracking so does the plug wire boot. the spark will travel through the carbon track in teh boot after plug replacement causing premature failure of the plug. it is a good idea to replace plugs and wires if this is the cause of your miss.

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