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Fouling out spark plugs and back fire - Harley Davidson Harley-Davidson Motorcycle Desktop Telephone

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  • phantomgirl Jul 21, 2008

    04 1200 Sportster - same problem - has been in 2 different dealership service depts for 3 of the last 4 weeks - crank sensor replaced, rejetted TWICE, intake seal replaced - still doing it - but worse. I can't go 3 blocks and the farther I go the worse it gets! Within 2 miles the bike has to sit for about 4 hours before it will crank again!

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Runnin way rich sounds like to me bad rings with blow by will oil fowl but with the back fire i think your runnin rich or timing is off but that shouldn't foul plugs

Posted on Apr 20, 2008

  • andrew kinslow Apr 21, 2008

    my last post was, well, uninteligible pardon me. the fouled plugs come from several different things: oil blow by, trash in the gas and really rich gas mix. since you have back fire I'm thinking running rich is your situation. uncombusted gas can cause back fire so can timing but that wouldn't foul plugs with fouled plugs and backfire I think your running rich.

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1 Answer

What are the fouls on a spark plug


Fouled spark plugs are when they aren't firing, causing a cylinder misfire. Can be caused by a burnt electrode inside the plug from being old OR too much carbon or oil on the tip between the electrodes where the plug fires.

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Check the spark plug for spark and check the plug to see if it is getting fuel or if it is gas fouled to much fuel

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Hi Anonymous, on twin cams make sure both spark plugs are in heads and use a grounded third plug to check for spark or hold spark plug cable close to spark plug in head. If still not getting spark the usual suspects are:
1. Fouled spark plugs.
2. Battery voltage below 8.7 volts, loose or broken battery cables especially ground cable to frame.
3. Loose connection at ignition coil or plug between ignition sensor and module.
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5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, MAP or BAS sensor.
7. Faulty ignition switch.
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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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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

2 Answers

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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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1 Answer

Engine wont fire up


Do you have fresh gas in the bike? Try changing the plugs with new ones and check for spark. You can do this by putting the new plugs on the plug wire and grounding it to the head on the engine crank the motor over you should see a bright blue spark. Check one plug at a time. No spark check the ignition wires and coils. As for the oily plugs it could be they are just fouled caused by either flooding the motor while trying to start, bad plugs, week coils, bad gas, poorly adjusted carb's. I would start with the plugs and work my way back to the carbs. Still fouling the plugs after all that start checking the engine, ie compression check ect.

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2 Answers

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Do a compression check and lets go from there. Bad rings CAN cause fouling

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