Question about 1987 Pontiac Firebird

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Spark Plug Fouling

Basically i want to know what is the hottest spark plug that i can run in my V6 3.8 99Camaro. My 6 cylinder keeps fouling out with oil on the end of the plug. So i want to run it with a hotter plug.

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  • yadayada
    yadayada May 11, 2010

    a parts store is the best source for theat info, they have the charts.

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  • 32 Answers

Fix the root cause . probly needs valve guid seals.

Posted on Mar 10, 2009

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1 Answer

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.

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1998 bmw 540i having a misfire on cylinder 5 changed the plugs and coil packs. It ran fine for a couple days, then it began again, giving me a check engine, and it's idling rough at low rpms.


Is the same cylinder causing the problem? If so take a close look at the spark plug for fuel fouling. The cylinder may be over fueled causing plug fouling. You may also have a bad coil or defective spark plug. Try swapping coil and plug with one from adjacent cylinder to see if misfire changes to that cylinder

Apr 06, 2015 | BMW Cars & Trucks

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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

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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

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

1 Answer

Keep fouling out the #6 cylinder plug, and a loss of power in a 99 tahoe.


You need a scanner to look at fuel and spark parameters. Bad coil or injector Take it for a drive while someone scans it

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I got a 1999 gmc suburban and the number 6 spark plug keeps fouling out replaced the injector what could be the problem


what is it fouling with. If its fuel check spark and plug--if it's oil-more serious- could be valve guides or seal or worse could be an oil ring. Either way it is going to be expensive.

Jul 25, 2009 | 1999 GMC Suburban

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