Xoutpost.com - View Single Post - Recommended spark plugs for N-62

StephenVA · #6 02-22-2016, 10:08 AM

Plug Recommendation:
When looking for plugs on these vehicles, I would recommend looking at the plug manufacture's website for what is the latest information: Example: NGK Spark Plugs USA. Technology has moved on since our vehicles were designed, engineered and screwed/bolted/welded together.

Without knowing everyone's year, engine, etc, I would recommend NGK Iridium IX® Spark Plugs over all others as owners have posted before. Most of the V8 models have NGK OE, others have a mix.

Like many others, I tried the two and four prong Bosch plugs and replaced them with the fine wire Iridium NGK plugs, due to poor idle, Tip-in acceleration response, etc. My 2005 4.8is had NGK OE fine wire but not the better Iridium ones. Having worked for one of the plug manufactures earlier in my career, I would say finding the right plug characteristics for your vehicle is more important than "what came in OE". Most of that thought is due to changes in fuels being pumped today. Summer gas, winter gas, ethanol, etc.

Note: Check the plug manufacturer's website for all applications not the distributors (resellers) as there are MANY errors on their sites.

TORQUE SPECS:
As mentioned, 23 nm /18ft-lb. Note: torque can be + or - 3nm. Multiple people have had the plugs back out if not torque to the higher number (20-ftlbs for us US based owners) (Note: head should be cool enough to hold your hand on it) It has been posted before that some owners experienced the plugs backing out of the head when using 18-Ftlbs (Me personally). Use the higher setting to not experience that on a long trip.
Lightly lube plug threads with copper- based anti-sieze compound (IF not on plug already- Note: some plug manufacturers have anti-seize on the threads already in the box).

Plug Gaps- There is no spec for multi prong plugs. Fine wire plugs use the same spec as posted .044"

Coil on Plug Boots: (if equipped) see the two types of coils images below. See Part #2 on the image. They just twist and pull off. These are really just short plug wires with the same deterioration that wires have. They will build up resistance over time to the point that the voltage leaving the coil can not over come the resistance and causes a miss fire. Recommended replacement is the same with plug wires, test resistance or toss away at plug change time 60/80,000K or every 5 years. Cheap insurance.

Attached Images of the two main types of coils and the two types of coil boots (Bosch and Bremi) as found in our X5s. The newer style "Clip on" coils do not have replaceable boots. A dab of Dielectric grease on the plug end will seal from moisture and that leaking oil from your valve cover gaskets

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