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Autolite XP Iridium for LNF/LE5
Item #: AL-XP5263
Availability: In Stock
Usually ships In 1-2 Business Days
These are the colder spark plug upgrade for the 2.4L LE5 or LNF engines.
Autolite XP Xtreme Performance spark plugs
Introducing the new Autolite XP Xtreme Performance Spark Plugs. With an iridium-enhanced, .6 mm finewire design and patented platinum sidewire technology, these plugs provide more focused ignition for better overall ignitability and improved durability.
Independent lab tests prove that Autolite XP Xtreme™ Performance Spark Plugs provide better overall ignitability and durability than many other premium spark plugs. By increasing the size of the flame kernel, you get a 21 percent bigger flame compared to that of standard plugs. The new Autolite plugs ignite more gas and air mixture inside the cylinders to deliver better overall performance. The ignition is also more focused, which provides better and faster fuel combustion, optimizing the vehicles spark plug performance.
Sold in sets of 4.
I replaced mine and left the stock gap (.050) This ran fine on the stock tune, when I upgraded to GMS1 it caused a misfire at higher rpm's. I regapped to the LNF stock gap (.034) which caused horrible drivability issues. I called Autolite support and they gave me the propper gap for these plugs in the LNF, which is .043-.045. Have put well over 22,000 miles on them so far with zero issues.
Good OEM replacement plug
Got these to troubleshoot P030x code on my cobalt SS/TC. Fixed the problem, the car seems to pull harder. Need to make sure the gap is set correctly first, since they come pre-set to .050 from the manufacturer, and the LNF engine should have them set at .032-.035
very bad spark plug!!!!i put these on my cobalt n a piece of a spark plug ended up braking n destroy my cylinder head.now im running on three cylinder n my pistons is mess up from the piece of the spark plug.n i ask them if there anyway i can fixs my engine n all they can tell me is i need a new engine.very bad people!!!!!