I just changed my plugs. I used the Champion 7318 Double Platinum .040 gap.
I have 55,000 miles and the ends were just about gone. The new plugs really helped out. Smoother running, hope it improves my mileage. .5 would be wonderful.
I will add a pic of the old plug.
I think im going to change my plugs soon. Im currently running Autolite because thats the only brand they had in stock last time I swapped them out. I'll probablly go back to Champion.
2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete
I just switched to Champion 7318's for the big ride out west.
Let us know how those plugs work out for you. I might swap those in this weekend.
Its going to be unfair comparison from me, because I finally got around to cleaning my K&N that had 36,000 and a solid year of wheeling stuck to it. Never the less I'll give an update after the trip.Originally Posted by 07JeepXK
Thanks....Im not so much worried about gas mileage. Just want the XK running good.
Well I didnt improve my mileage much, but I have more response to the throttle. Runs smoother.
Dirty Plugs.....
Last edited by cico7; 06-30-2010 at 06:31 AM.
$8 a plug?!?! I spent $3.
When I first bought the XK, I was kind of surprised at 30k mile plug changes in the manual. That's different in a world of 100,000 mile tune-up engines.
But... after reading about the 4.7L engine on sites such as this: http://www.allpar.com/mopar/47.html I see it's actually a pretty high performance engine at that. I can see how plugs get eroded after 30,000 miles. It's almost like being back in the muscle car era again.
2006, 4.7L, QTII, Toyo Wild Country M/T 265/70R17 tires, Ultrasport 175 wheels, Rocky Road 2.25'' lift kit, HID off-road lighting, Surco 50x60 roof rack, Foxwing awning, Superchips performance programming.
I spent about $6 per plug for Autolite Iridiums, IIRC. I went with them because of recommendations and longer service intervals. I did cost a bit to do the service...
$6 x 16 Hemi plugs = $96
My Hemi has an EPA Hwy rating of 18mpg, but with easy driving and rolling terrain I can get about 20mpg. I didn't notice much difference in power or response. Service done at 30k miles.
2007 Commander Overland / 4" SuperLift / 285/70R17 Cooper Discoverer ST Maxx / Rusty's adjustable rear UCAs / Carolina Driveline front drive shaft / Flashpaq / DRLs & Tilting Mirrors / Autolite Iridiums / Cobra 29LX Chrome LE CB & Firestik antenna / Rear fog lights / Mopar Grille Guard with HID driving lights
"4 wheel drive does not mean 4 wheel stop!" -Lee Goldberg, WABC TV weatherman
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