Mazda 3 2.0 skyactive

[desy]

Which way are the cylinders numbered 1-4 from which end? this is for a 2012

 

[desy]

FYI I guessed and had a code indicating #4 misfire after I changed plugs, put in an old plug into #4 and the problem cleared up.
Unusual for brand new plugs to be defective? NGK iridium

 

[ISAslot]

Maybe check if you got fake ones.

WARNING - Beware of updated fake 'NGK Iridium IX' Spark Plugs & How To Spot Them - August 2017 (OUTDATED)

Over the last few weeks, we've come to the attention of a new 'breed' of highly accurate counterfeit 'NGK Iridium IX spark plugs on the market. To the

www.driven2automotive.com

 

[desy]

Cool I just sent my girl to get it replaced so I'll take a hard look at the new one