Dark coloring, such as heavy black wet or dry deposits, can indicate an overly rich condition, too cold a heat range spark plug, a possible vacuum leak, low compression, overly retarded timing or too large a plug gap.
What are the rings on spark plugs for?
When a spark plug well fills with oil, it means that the O-ring that seals the well to keep out oil and debris has deteriorated and started to leak.
What does a red colored spark plug mean?
However, don’t be dismayed if ceramic insulator tips (center and ground electrodes on a plug) are pinkish-red in color. That pink coloration is created by deposits from additives in unleaded fuel when they’re burned off during combustion.
What color should the tip of a spark plug be?
A normal spark plug will have brown or grayish-tan deposits on the side electrode.
How do you read a lean or rich spark plug?
Part is the porcelain now what you're looking at the porcelain for at all times as you're looking for a rich lean condition. Now this is gasoline or 85. This was in particular a gasoline spark plug.
What does a black spark plug mean?
Black spark plugs are a sign of a weak spark or too much fuel in the air-fuel mixture.
Will a hotter spark plug stop fouling?
Rich air/fuel ratios require a hotter plug to prevent fouling. Mixtures that cause the plugs to read lean might contribute to preignition or detonation.
Can fouled spark plugs be cleaned and reused?
YES you can clean and reuse your fouled plugs. I am an aircraft mechanic and we clean, gap and test plugs every fifty hours on aircraft. If you get a fouled plug, clean off the deposits with carb cleaner. For tough deposits use a brass wire brush (the brass will not damage the electrode.
Does seafoam foul spark plugs?
If applied correctly there is no reason whatsoever to change your plugs after using Sea Foam Spray. The only way to foul plugs is if you don’t elevate the RPM when applying the product.
How many miles do noble metal spark plugs last?
Consistent performance over a long life
Many nickel-chromium plugs need to be replaced every 20,000 to 30,000 miles, depending on wear and the specific plug, but noble metal plugs can last for more than 100,000 miles.
Is iridium or platinum better?
Iridium is said to be six times harder and eight times stronger than platinum with a 700° higher melting point. Iridium spark plugs have extremely fine electrodes while retaining excellent wear characteristics. Thanks to its strength, iridium spark plugs can last up to 25% longer than comparable platinum spark plugs.
Is it worth buying iridium spark plugs?
Iridium spark plugs are the most expensive spark plug model on the market, but in many cases they are worth the investment, as the premium price also comes with high performance and reliability.