View Full Version : 2003 LQ9 Sparkplugs?
07-01-2009, 03:30 AM
Can anyone tell me what brand and size spark plugs are recommended for the LQ9?
07-01-2009, 02:29 PM
AC-Delco 41-985 platinum only. can be pricey shop around just changed them on my LQ9 dont forget to check the gap should be .050
07-03-2009, 09:06 PM
I went through this last year. They changed the specs the the pugs a few times over the years but after some thorough research my best result was with ngk tr-55 regular copper tops! This was a recommendation from MYMC if my memory serves. Because the LQ9's eat plugs it is easier ,and way cheaper to use the tr-55's and just change them out every year. They work as well if not BETTER than the stupid expensive platinums that are speced for that motor. Trust me you will be a happy dude with them!!!;)