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Fouled spark plugs

2000 explorer keeps fouling number 1 plug

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  • Ford Master
  • 2,196 Answers

Usually one of 2 causes. Most common is a bad valve stem oil seal allowing the oil past the valve stem when the engine is shut off.Second is a broken or bad oil ring on that piston. Be blessed.

Posted on Jan 02, 2014

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6ya6ya
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Posted on Jan 02, 2017

mrgreenz
  • 962 Answers

SOURCE: Spark plugs are fouling out

Build up on the spark plugs due to dirty oil being used. Maybe before selling it to you.Some other problems could be happening. for example, Bad fuel, bad timing etc.

Posted on Nov 12, 2008

baccardo
  • 150 Answers

SOURCE: runs rough and keeps fouling out new spark plugs

sounds like too rich of a mixture check for vacuum leaks and check fuel press regulator

Posted on Apr 23, 2009

carlsbiz
  • 1124 Answers

SOURCE: Shrill noise and fouled spark plug

Yup - its conected.. Its more than likely a head gaskit or cracked head.. Did it get really hot ?

Hope this helps !!
rate me good ;o)

Posted on Jul 13, 2009

  • 92 Answers

SOURCE: oil in number 1 cylinder, fouling out plug

is there oil actually in the cylinder? or is the oil in the tube that the spark plug body lives in? if it's just in the tube, then you only need a valve cover gasket set which comes w/ a round rubber seal for the top of each spark plug tube. if however, the oil is actually in the cylinder, then you either have a faulty piston oil ring or faulty valve seals. the repairs for rings/seals are a giant PIA. let's hope it's just the valve cover gasket set

Posted on Sep 29, 2009

boizrus
  • 1 Answer

SOURCE: I got a 1999 gmc suburban and the number 6 spark

I had the same problem. To see if it was a bad a wire, I switched the spark plug wires on #6 and 8. Haven't had a problem since. I think it might have been the plug wires being re-seated when I swithced them took care of it.

Posted on Nov 10, 2009

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Rear spark plug bank is fouled. The 3 in front are fine. What cold be the problem?


I am assuming it is oil fouled rather than fuel fouled. Oil fouling is usually due to valve stem seal leakage. Most engines have the oil return on the cylinder head at the rear. When the engine is shut off, some oil pools at the rear of the head. If the valve guide seals are worn, then the oil will leak around the stem of the #4 valve and eventually foul the plug. If there are no real issues with the engine other than this one, it is usually best to keep a clean plug or two available and swap out the plug periodically when fouling is detected. Then clean the fouled one and keep for reuse later. If it is happening too often, getting the cylinder head reconditioned is a good idea.

Oct 09, 2015 | 2006 Acura MDX Touring

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Where is Bank 1 H20s sensor Located


A Bank 1 O2 sensor error usually means that you have a fouled spark plug, a stuck fuel injector, or a bad spark plug wire; not necessarily that the sensor itself has gone bad. (It is an "out of range" error.)

May 13, 2015 | 1996 Ford Explorer

1 Answer

Hi i changed spark plugs 3 tyms in six Weeks az 1 of my spark plugs keeps on misfiring wats the problem????


Hi Aadil:
The spark plug that is misfiring should tell the story. Is it oil fouled? Bad rings or valve seal. Is it carbon fouled? Electrodes fried? Wet looking? Maybe a bad plug wire and it's not firing properly?
What kind of engine?
See if you can isolate the problem and we'll try to be more specific with help.

Mar 19, 2015 | Cars & Trucks

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Truck starts but stops immediately and smoke comin out of my tailpipe


Well it depends on the color of smoke if it's WHITE; it could be a blown head gasket (check coolant levels and then oil to see if it is milky looking) BLUE: could be burning oil, which could result to fouling plugs (check spark plugs for fouling) BLACK; too much fuel flooded (check spark plugs for fouling)

Oct 12, 2013 | 2000 Chevrolet Blazer

2 Answers

One plug foul after 200 miles runs ruff


the next time it fouls check the plug when you take it out, if it is covered with oil then you may have a broken ring on the cylinder that is allowing oil to pass through to the combustion chamber and fouling the plug. Or the valves pay be letting oil drain in past the valve seats.

Jul 04, 2012 | Chevrolet Caprice Classic Cars & Trucks

1 Answer

Scott, 95 GMC 5.7L keeps fouling plugs


Hi Dale,

Several factors can contribute to spark plug fouling:

- The air/fuel ratio may be too rich as a result of incorrect carburetor adjustment or a poorly performing fuel injection system.
- Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling.
- The ignition system may not be performing properly.
- Prolonged idling or continuous low-speed driving may keep the spark plug from reaching its optimum operating temperature. Using too cold a spark plug can lead to the same problem.
- A dirty air cleaner can create a too-rich condition which can lead to fouling.

Have each of the above checked and corrected.

Fuel, oil and carbon fouling can all be the result of different causes but, once a spark plug is fouled, it will not provide adequate voltage to the firing tip and that cylinder will not fire properly.

In many cases, the spark plug cannot be cleaned sufficiently to restore normal operation. Hence, I always recommend that a plug be replace, once it becomes fouled.

Cheers,

Scott


"If this has helped you in any way, please be kind enough to rate this solution"

Nov 02, 2011 | 1995 Chevrolet K1500

1 Answer

95 GMC 5.7l keeps fouling plugs


Hi Dale,

Several factors can contribute to spark plug fouling:

- The air/fuel ratio may be too rich as a result of incorrect carburetor adjustment or a poorly performing fuel injection system.
- Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling.
- The ignition system may not be performing properly.
- Prolonged idling or continuous low-speed driving may keep the spark plug from reaching its optimum operating temperature. Using too cold a spark plug can lead to the same problem.
- A dirty air cleaner can create a too-rich condition which can lead to fouling.

Have each of the above checked and corrected.

Fuel, oil and carbon fouling can all be the result of different causes but, once a spark plug is fouled, it will not provide adequate voltage to the firing tip and that cylinder will not fire properly.

In many cases, the spark plug cannot be cleaned sufficiently to restore normal operation. Hence, I always recommend that a plug be replace, once it becomes fouled.

Cheers,

Scott


"If this has helped you in any way, please be kind enough to rate this solution"

Nov 02, 2011 | 1995 Chevrolet K1500

1 Answer

1998 Chevy Silverado K1500, 5.7 , number 5 cylinder keeps fouling the plug with oil. The insulator was broken in half vertically


If the insulator was cracked the plug would have been misfiring, unless it was broken while trying to remove it. If this oil fouling is an ongoing problem, and you have to keep changing the plug, buy a spark plug that is designed to fire when oil fouling is a problem. You may have to order one from a part catalog, such as JC Whitney. This would keep you going until you can get the problem repaired..

Dec 29, 2010 | 1998 Chevrolet K1500

2 Answers

Cyl#3&5 foul plugs 97 suburban good compression all cyl new cap rotor distributor wires plugs module


Fouling occurs when the spark plugs' firing tip becomes coated with excessive fuel, oil, or combustion deposits so that it is unable to produce a spark. A plug can become fouled from continuous low speed driving, improper spark plug heat range (too cold), improper timing (over-retarded), too rich an air/fuel ratio or an oil leak into the combustion chamber. A variety of self-cleaning features are designed into most plugs to reduce fouling.

Jul 17, 2009 | 1999 Daewoo Nubira

1 Answer

Put on analyzer number 4 cycliner is missfiring


Replace the spark plugs and wire set and add fuel injector cleaner in the gas tank for the next three fill up's. If money is tight try swapping the spark plug wire with another wire and see if the missfire moves, but before you do that inspect the spark plug's condition. Remove the spark plug to see if it's fouled with carbon which is a run rich condition and if there was detonation the plugs will have a worn or damaged electrode. Keep me posted, be glad to help.

Jun 30, 2009 | 2000 Ford Contour

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