Many spark plugs have nickel-plated threads on the plug shell to prevent corrosion between the steel threads on the plug and the aluminum threads in the cylinder head.
Plain uncoated spark plugs offer no corrosion resistance whatsoever when installed in aluminum heads. Dissimilar metals can react over time causing the spark plug to stick in the head. Advertisement The use of anti-seize compound on spark plug threads to make future replacement easier is not recommended for two reasons: anti-seize acts like a lubricant, which increases the risk of over-tightening the spark plug and damaging the threads in the cylinder head, and it can contaminate the electrode causing the plug to foul and misfire.
Spark plugs should be installed dry and tightened to specifications. On some applications, like to Ford trucks with 5. The plugs tend to stick in the heads, and often break off leaving the tip of the electrode stuck in the head. Some aftermarket replacement spark plugs for these applications are a one-piece design to resist breakage.
Replacing the OE plugs before they reach 40, miles can also reduce the risk of breakage. Search for spark plugs by specifications and dimensions. Create an Account Log in Cart 0. My cart Close mini cart. Contact us Log in Create an Account. Shop parts Application. Jan 2, 13, 54 Not even sure what type plugs are in my 04 Suburban 5.
Run 'em until you get a miss. Jun 30, 7, 4 0. Random anecdote:. Sep 15, 7, Last edited: Jul 11, I have a 16 plug swap coming up.
Fortunately it's only cheap copper plugs. SparkyJJO Lifer. May 16, 13, 6 This thread does remind me I still have yet to replace the copper plugs in my car. They've been sitting on my bench for a couple months now :hmm:.
Life is k. If you are in there checking the "gap" why wouldnt you just replace them lol.. I guess for me I would just replace them and worry about the MPG issue later. Plugs are just not that expensive, people.
General worst case on most modern vehicles? Six plugs at bucks a pop. I have no reason to believe iridium lasts any longer. Exhaust: Also known as outlet. During the exhaust stroke, the piston, once again, returns from B. This action expels the spent air-fuel mixture through the exhaust valve. Despite their relative material strength and solidity, spark plugs will wear down, degrade in quality, and eventually fail completely if left unchecked.
If the plug breaks down completely, your engine may not start at all. The average, modern iridium spark plug should last for , hours of engine uptime, depending on the gas quality. Each make and brand of spark plug should come with its own estimated rating for hours of use without degradation or failure.
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