Do "fouled" spark plugs need to be replaced or just cleaned?

Question

I'm not even sure if I know the definition of "fouled" , but I think I used too much throttle trying to start my 88 FZR 400 and now it won't start. I removed a couple of the plugs and they were soaked with gas...I think this is what you call fouled. Do I need to replace them or just clean them up/dry them off?

Answer 1

This is called gasoline fouling. As a general rule, spark plugs can be cleaned, however it needs to be done right. This entails using a "spark plug cleaner" which is like a small version of a sand blaster. It cleans out deep inside the base and removes carbon buildup as well as oil etc. Then regap the plug and your ready to go. I have, in an emergency cleaned plugs by drying them offf thoroughly, scraping off the carbon etc and re used them. HOWEVER, for the best results, toss em and buy new ones. Some plugs, like auto lite, have a lifetime warranty, but you must save the original sales slip. So if you get some with a warranty, keep the sales receipt and toss the original box in the car somewhere safe.

Answer 2

I used to clean plugs with a little sand blaster attachment. You would put the plug into this hood and connect air to the tool and it would blast the plug clean. BUT I do not recommend doing this anymore. Plugs are inexpensive. Replacing them is better. If you clean with a wire brush it can cause problems as the scratches in the electrode or ground wire can cause misfires. Spark plug diagnosis is on the attached page with photos.

Answer 3

For the cost of the plug, just replace it and save yourself the trouble. Sometimes you gotta take a torch to it if it's really bad. I'd just replace it and have a fresh plug. With that being said, it's time to look into why your fouling plugs.

Answer 4

"Wet" plugs are a sign of several conditions. You aren't firing, simply. Check the plug wire for fire by grounding plug to head and turning engine over. Be careful, you can get shocked. You should see a strong spark. If you see fire, do a compression check ( gauges can be bought at you auto parts store ) and make sure you have compression. You cannot get the fuel to ignite without it. If you have the recommended compression, check your intake gaskets, if they are leaking, you get a effect that causes the gas to " puddle " in the engine. The gas must be vaporized to burn. Good luck!

Answer 5

whenever you foul a plug out...you should always replace it.

Answer 6

if you've gone through the trouble of removing it you might as well replace it