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Reading spark plugs

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    #1

    Reading spark plugs

    Just thought I would post this if any of you ever pull your plugs for whatever reason. You can usually tell how well your engine is running by looking at your plugs. Thats if you know what you are looking at.

    http://www.centuryperformance.com/spark2.asp
    Tags: None
    #2
    nice link, last i checked my plugs were oil fouled. havent really fixed it yet though.

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      #3
      This is sorta true, but plug reading really only works if you run your engine in certain conditionns to get your reading. For example, say your motor happens to be running lean at full throttle, high RPMS, but rich at idle. You go and do a full throttle pull down the road, but let your car idle for a minute or so before shutting it off...the plugs will likely look black, thus making you think it's running rich.

      So, basically, just reading plugs that have been in your car for a while doesn't tell you a whole lot!
      1990 Accord LX Sedan, B-49M

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        #4
        Originally posted by djphonics
        This is sorta true, but plug reading really only works if you run your engine in certain conditionns to get your reading. For example, say your motor happens to be running lean at full throttle, high RPMS, but rich at idle. You go and do a full throttle pull down the road, but let your car idle for a minute or so before shutting it off...the plugs will likely look black, thus making you think it's running rich.

        So, basically, just reading plugs that have been in your car for a while doesn't tell you a whole lot!
        That's why when you're reading plugs, you run the engine up to the point where you're interested in checking, the immediately shut the car off.

        It's how everyone tuned cars before widebands were available.

        It's still used by a lot of muscle car builders. I check spark plugs almost all the time when I tune.

        CrzyTuning now offering port services

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