Question about 2005 Harley Davidson FLHT - FLHTI Electra Glide Standard

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The front spark plug is fouling out - 2005 Harley Davidson FLHT - FLHTI Electra Glide Standard

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Look at the plug carefully and determine exactly what is fouling the plug. Is it gasoline or oil. If it's oil, you've probably got a bad valve stem seal. If it's gasoline, you've got an intake problem such as a vacuum leak on the rear cylinder.

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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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

Tip

Fast relief for fouled spark plugs


I have found that by pulling the spark plug cap part way off of a fouled spark plug, so that the spark has to jump about 1/4" from the electrical contact inside the plug cap, to the end of the spark plug has the effect of raising the voltage to the spark plug considerably. Usually it's enough to cause a fouled spark plug to begin functioning normally again. It doesn't work in every instance - but you've got nothing to lose by trying it.

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1 Answer

2002 harley electra glide front spark plug keeps turning black


Hi Anonymous, hopefully it's just gas fouled not oil fouled, noticed by white smoke out of exhaust. Anyways here is a short list of could be's: battery voltage, charging system, ignition components need at least 9 volts to function, spark plug, spark plug cable, ignition coil, ignition module. Good luck

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1 Answer

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try cleaning the carbs, changing plugs, and cleaning the fuel tank. If that doesn't work, it might be the piston rings are getting worn out or you cylinder sleeves need a honing.

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1 Answer

92 vt600, only back cylinder is firing


How so it isn't fouled? If it is getting any gas at all there should be gasoline on the plug assuming the cylinder is in fact not firing. Is the plug sparking? If so what about the carb? Compression check?

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Rear cylinder is cool to the touch, the front one is hot


The spark plug on the rear cylinder isn't firing. Check the plug for fouling and make sure the spark plug wire is good and connected to the coil and plug properly. Also check the spark plug gap (0.040)

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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


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1 Answer

I have 2007 suzuki intruder the front spark plug was replaced 3 times due to intermitant spark.Each time i check the spark plug no spark then replace the plug then spark then runs for short period the No 1...


Fouling of the spark plug makes the exhaust extremely hot due to the burning of the fuel mixture inside the exhaust pipe and the spark plug end turn to black, fouling of the spark plug may be due to too rich fuel mixture check the correct setting of the air valve.

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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.

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Rear cylinder not firing


The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

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