Again, my 2014 Spark! Noticed a tapping noise as if a spark plug wire was arcing!!! Been around car for along time!! All tech's look at people like they don't know what the hell your talking about!! OK !! Well, told the tech about it, he couldn't find problem!! I took car back and for weeks I couldn't duplicate it so I thought it was me. So it happened again, I would shut the car off and back on when it did this and it was fine!!

Well one cold morning went out to let the car warm up and hit the rear defrost, heard the noise!! Hit the button again and it went away!! I took it down for another issue and told the tech. Well he said just the relay! He will order it ! He did but then called and kept car for further investigation cause that didn't cure problem!!! Come to find out 1 of the main body computers was the cause, it was replaced and no more issue!! He said there were like 10 computers in these Sparks!! Don't know what to believe on that! But probably!!!