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Wrong spark plugs

Question : My mechanic put the wrong spark plugs into my car. Now I am losing compression in the cylinders. Could you tell me how the spark plug works and why it has caused a carbon buildup which led to a loss in compression in my engine?

Answer : Putting the wrong spark plugs into your car would not cause a compression loss in the cylinders unless the plugs are of a shorter reach than the original. It would also not cause a carbon buildup in the cylinders. Putting the right spark plugs in your engine should correct any problems you are having. However, if you have been running the engine for some time with the shorter reach plugs, you will have to be careful when putting in the right plugs as there could be some carbon buildup on the threads, and you may have to run a threading tap through to clear it up before putting in the plugs.

 
   
 

Sooty spark plugs

Judging the air-fuel ratio

Spark plugs covered with oil

Are 'fancy' plugs good ?

Spark plug won't last

Misfiring spark plugs

Spark plugs poser

Soiled plugs, tired engine

Wrong spark plugs

 

Sump repairs won't last

Not too hot, not too cold

Get the spark right

Glow and new glory

Window into the ( car's ) soul

Clogged plugs

Plug cables

Up in smoke

 

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