2008 Mega Cab 5.7L HIGH MILEAGE Spark Plugs
Captain
Joined: Mar 2010
Posts: 725
Likes: 14
I changed mine (I know, shame on me!) at 117K. Truck ran fine, plugs looked great, and no difference in performance or mileage after they were changed out. Use OE Champion plugs. No need to spend any more money on plugs. You may even experience gremlins if you don't go the Champion route.
I now have 215K and truck still runs like new.
2006 Mega 5.7
I now have 215K and truck still runs like new.
2006 Mega 5.7
Thread Starter
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Registered User
Joined: Jan 2013
Posts: 15
Likes: 0
Got them changed, no problems at all. The new plugs were gapped at about .45 and old plugs were at about .63, been in there a while. Smoked like a freight train for a minute but does seem to run better now.
Champion
Joined: Aug 2007
Posts: 4,702
Likes: 2
From: N. Florida
Mostly 'cause Champion wouldn't know a good plug if you showed 'em a 5306. Who says NGK is designed for foreign engines? NGK, Bosch and Denso make a better plug than Champion any day.
Champion
Joined: Aug 2007
Posts: 4,702
Likes: 2
From: N. Florida
Whether or not a vehicle is foreign or domestic has nothing to do with the spark plug. I had a Ford Escort with the 1.9L engine that used stock Motorcraft copper plugs but ran great when I switched to Platinum spark plugs. Great, as in 400 miles per tank of gas even with the A/C running.
By "run like hell" I meant it's not going to be operating optimally if those are the original spark plugs. I recently serviced my truck and discovered whoever previously changed the plugs thought Lithium grease would work fine on the spark plug terminal. That, and I should have checked the air cleaner when I bought it as well.
Anyway, you may want to check the air cleaner and also pull the throttle body. Chances are that the backside is coated with carbon and oil. Even trucks that aren't neglected in the maintenance department experience that. There's a thread around here where we've discussed our findings. Note: Do not clean a throttle body with carburetor cleaner. Only use throttle body cleaner.
By "run like hell" I meant it's not going to be operating optimally if those are the original spark plugs. I recently serviced my truck and discovered whoever previously changed the plugs thought Lithium grease would work fine on the spark plug terminal. That, and I should have checked the air cleaner when I bought it as well.
Anyway, you may want to check the air cleaner and also pull the throttle body. Chances are that the backside is coated with carbon and oil. Even trucks that aren't neglected in the maintenance department experience that. There's a thread around here where we've discussed our findings. Note: Do not clean a throttle body with carburetor cleaner. Only use throttle body cleaner.