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Thread: Spark Plug Recommendations
06-06-2010, 09:17 AM #1
Spark Plug Recommendations
My 2004 Suburban has only 38,500 original miles, (mostly highway/non-towing, trip miles) however, after owning it for 6 years (since new), I'm beginning to replace items such as hoses, belts, coolant etc.
Not that the parts are bad, I'm only concerned about eventual part failures due to age.
I'm thinking the spark plugs installed at the factory were 100,000 miles plugs, but I can't remember if they were platinum or iridium.....Anyone know?
Also, will the vehicle benefit by replacing the spark plugs with new, high quality AC or Bosch plugs?
Should I replace the spark plug wires/cables as well?
Any specific brand/type recommendations?
As always, Thank You for the excellent responses!
Last edited by Psyc0; 06-06-2010 at 09:20 AM."I Hate When That Happens!"
06-06-2010, 12:22 PM #2
You shouldnt have to replace them unless they you have visual confirmation they are fouled (if so you might have other problems), and DO NOT use anything but what is already in them if you do replace them. Changing plugs to a different brand in these Vortec engine just isnt worth it. Just search on this sight and you will see most experiance power and MPG drops going to a "higher quality/performance" plug on a factory ignition99 K1500 Suburban LT "THE BEAST"
Hypertech III, K&N, true dual
06-06-2010, 12:36 PM #3
AC Delco platinums. Gap them at .040" for a small block, .050" for the 496.
Truthfully, with your mileage, new plugs can go to the bottom of the list. It wouldn't hurt to pull them to check condition, and tighten the gap down if they are at .060". New wires wouldn't hurt though, age seems to be the bigger factor. And once you start moving older wires, like when changing plugs, they tend to start leaking pretty badly.When you hear hoofbeats, look for horses not zebras.
06-06-2010, 12:52 PM #4
This particular model comes with AC-Delco Iridium plugs, rated at 100,000 miles. Unless you get a bad valve seal or bad gas, you shouldn't have to worry about them until then.
06-08-2010, 06:21 AM #5
06-14-2010, 06:27 PM #6
- Join Date
- May 2008
Actual just about to do a 100k service on my 06 5.3 and replace the plugs and wires. I have always had good luck with NGK plugs in my race bikes and in my Nova it was nothing but Champion... Do NGK or Champion plugs work good or should I just go get Delcos?-Jimmy
-06' Silverado 1500 Z-71 (5.3l, 4L65e, NP261 transfer, B&M +3 tranny pan, Moser T6 diff cover, Bank CAI, Banks Monster Exhaust, leveling kit, LineX bed, Pioneer Premier DEH-P780MP, Firestone RideRite airbags, KMC Enduro 16x8 rims, Yokohama Geolander A/T 285/75R16, Taylor 10.4mm wires)
06-14-2010, 08:18 PM #7
06-15-2010, 04:43 AM #8
- Join Date
- Jan 2010
- Bountiful, Utah
255/70/17 BFG mud terrains
And after all that it is still SLOW!!!!
06-15-2010, 10:19 AM #9
- Join Date
- May 2008
Well, thanks for the heads up. With the AC Delco's you guys recommend the Iridium or the Platinum? I am hearing conflict on which way to go...
06-15-2010, 11:38 AM #10
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