Old Habits: Spark Plug Service Now

by | Nov 2012 | 11 comments

A whole lot of evolution has occurred since most of us first started replacing plugs, so it's time we re-examined our procedures and incorporate the latest subtleties

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Understanding Mercedes-Benz Lane Keeping Assist

Understanding Mercedes-Benz Lane Keeping Assist

Understanding how steering, Electronic Stability Program, acceleration, braking, camera and radar sensors interact in the Mercedes-Benz Active Lane Keeping Assist program can help you maintain system reliability. It would be a shame if this beautiful 2021 GLA 35...

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11 Comments

  1. Wovtam

    Very informative thanks

  2. ejowrench

    fyi, NGK makes spark plugs for ACDELCO. Some Delcos are made by Champion [mostly the older ones] AC stands for Albert Champion. He started his own company. Auto lite makes plugs for Ford Motorcraft. Bosch makes plugs for euro cars. [ keep it that way ]. -just some trivial facts that a tech should know……Ernie

    • just_plain_yogurt

      >fyi, NGK makes spark plugs for ACDELCO. Some Delcos are made by Champion [mostly the older ones] AC stands for Albert Champion.

      UGH.

      NGK makes *some* Delco plugs. They’re clearly marked as NGK on one side and DELCO on the other side.

      Champion doesn’t make anything for AC Delco. They are entirely different companies and have nothing to do with one another.

      https://en.wikipedia.org/wiki/Albert_Champion_(cyclist)

      Autolite manufactures Motorcraft spark plugs. Decades of experience have taught me that Autolite plugs are far inferior to Motorcraft plugs.

      Bosch makes plugs for all kinds of cars. They’ve been making OEM replacement plugs for American cars for at least 35 years.

  3. Nwizard

    Thanks for the information! Now please excuse me while I go change my spark plugs!

  4. jonnyk007

    60k… I don’t know on some of this anymore. ive pulled out plugs with 154k and they looked brand new with correct gap very much intact. more shocking, I recently pulled out plugs out of a 2002 2500 with the LQ4 with 275k, it still had the original plugs!!! whoever makes ac delco plugs does a hell of a job!

  5. 4WMjacson

    Good info.I’ve ran across a few of the Tritons that needed rethreading.100K plug change,I Agree With ur Analogie,the one seen at 100K plus u could drive a trk thru the gap!I started recommending to the customer change them sooner so. As to save repair,time,and money.

  6. ericred

    Great article…It always amazes me how vehicle owners will skimp on maintenance!…over the last 40+ years..I’ve seen a lot of changes..and the biggest is the trend in the last couple of decades, its the move to private vehicle leasing…”Back in the day”, only company leasted vehicles…and maintained them accordingly…but then came private leases…people started “borrowing” their cars…Zero maintance, as they were driving something twice as expensive as they could afford,so how to pay for maintance?..then when it was resold from the used car store..it was advertised as “Fresh off lease” & falsely claimed to have everything as new..so the next guy puts another 2/3 years worth of use on the thing..then when it starts having problems..they come into my shop & I get to tell them that the timing belt broke & bent all the valves,cause it had never been replaced…or the head has to come off,as the plugs are original..It gets worse, because Everyone wants that 2-4 year old luxury car..and can’t afford to put gas in it! let alone do preventive maintenance.If I had a Dollar for every time I’ve heard: I’ve done my maintenance…I took it to fast lube last week! I remember when seeing a BMW or a Benz..was a rare occurrence…now they are in every driveway..with bald tires & dime store brake pads!..
    Just my Grumpy old Opinion!

  7. Hunterb

    the reason you wrecked the aluminum head with your spark plug is ,you have a head gasket leak the antifreeze peens the threads on the plug so when you try to take it out it takes the thread with it

  8. 67pkup

    I had to chuckle when the fellow said he could forsee M10 plugs coming…. those I have on the shelf. The standard size of the vehicles from the 40’s is M10!

  9. badass88s10

    good info.. never understand why someone would neglect relatively simple maint. but…..dealer recommendations for service intervals do make us lazy, that’s why our cars run better/faster…… we don’t believe what we read..

  10. omanolo

    The increase in gap over mileage would not necessarily be linear. As the gap increases, the resistance and hence the voltage would increase accelerating gap wear. Gap wear is not the only problem though. Plug contamination of deposits from inferior fuel quality, infrequent oil changes and otherwise poor maintenance or driving habits are other factors that can affect even the most well engineered and perfectly installed spark plug. Every couple of years or 30 to 40K miles would be good. Plus, it gives a good technician an insight to the internal condition of the engine.

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Understanding Mercedes-Benz Lane Keeping Assist

Understanding Mercedes-Benz Lane Keeping Assist

Understanding how steering, Electronic Stability Program, acceleration, braking, camera and radar sensors interact in the Mercedes-Benz Active Lane Keeping Assist program can help you maintain system reliability. It would be a shame if this beautiful 2021 GLA 35...

read more

11 Comments

  1. Wovtam

    Very informative thanks

  2. ejowrench

    fyi, NGK makes spark plugs for ACDELCO. Some Delcos are made by Champion [mostly the older ones] AC stands for Albert Champion. He started his own company. Auto lite makes plugs for Ford Motorcraft. Bosch makes plugs for euro cars. [ keep it that way ]. -just some trivial facts that a tech should know……Ernie

    • just_plain_yogurt

      >fyi, NGK makes spark plugs for ACDELCO. Some Delcos are made by Champion [mostly the older ones] AC stands for Albert Champion.

      UGH.

      NGK makes *some* Delco plugs. They’re clearly marked as NGK on one side and DELCO on the other side.

      Champion doesn’t make anything for AC Delco. They are entirely different companies and have nothing to do with one another.

      https://en.wikipedia.org/wiki/Albert_Champion_(cyclist)

      Autolite manufactures Motorcraft spark plugs. Decades of experience have taught me that Autolite plugs are far inferior to Motorcraft plugs.

      Bosch makes plugs for all kinds of cars. They’ve been making OEM replacement plugs for American cars for at least 35 years.

  3. Nwizard

    Thanks for the information! Now please excuse me while I go change my spark plugs!

  4. jonnyk007

    60k… I don’t know on some of this anymore. ive pulled out plugs with 154k and they looked brand new with correct gap very much intact. more shocking, I recently pulled out plugs out of a 2002 2500 with the LQ4 with 275k, it still had the original plugs!!! whoever makes ac delco plugs does a hell of a job!

  5. 4WMjacson

    Good info.I’ve ran across a few of the Tritons that needed rethreading.100K plug change,I Agree With ur Analogie,the one seen at 100K plus u could drive a trk thru the gap!I started recommending to the customer change them sooner so. As to save repair,time,and money.

  6. ericred

    Great article…It always amazes me how vehicle owners will skimp on maintenance!…over the last 40+ years..I’ve seen a lot of changes..and the biggest is the trend in the last couple of decades, its the move to private vehicle leasing…”Back in the day”, only company leasted vehicles…and maintained them accordingly…but then came private leases…people started “borrowing” their cars…Zero maintance, as they were driving something twice as expensive as they could afford,so how to pay for maintance?..then when it was resold from the used car store..it was advertised as “Fresh off lease” & falsely claimed to have everything as new..so the next guy puts another 2/3 years worth of use on the thing..then when it starts having problems..they come into my shop & I get to tell them that the timing belt broke & bent all the valves,cause it had never been replaced…or the head has to come off,as the plugs are original..It gets worse, because Everyone wants that 2-4 year old luxury car..and can’t afford to put gas in it! let alone do preventive maintenance.If I had a Dollar for every time I’ve heard: I’ve done my maintenance…I took it to fast lube last week! I remember when seeing a BMW or a Benz..was a rare occurrence…now they are in every driveway..with bald tires & dime store brake pads!..
    Just my Grumpy old Opinion!

  7. Hunterb

    the reason you wrecked the aluminum head with your spark plug is ,you have a head gasket leak the antifreeze peens the threads on the plug so when you try to take it out it takes the thread with it

  8. 67pkup

    I had to chuckle when the fellow said he could forsee M10 plugs coming…. those I have on the shelf. The standard size of the vehicles from the 40’s is M10!

  9. badass88s10

    good info.. never understand why someone would neglect relatively simple maint. but…..dealer recommendations for service intervals do make us lazy, that’s why our cars run better/faster…… we don’t believe what we read..

  10. omanolo

    The increase in gap over mileage would not necessarily be linear. As the gap increases, the resistance and hence the voltage would increase accelerating gap wear. Gap wear is not the only problem though. Plug contamination of deposits from inferior fuel quality, infrequent oil changes and otherwise poor maintenance or driving habits are other factors that can affect even the most well engineered and perfectly installed spark plug. Every couple of years or 30 to 40K miles would be good. Plus, it gives a good technician an insight to the internal condition of the engine.

Submit a Comment