Blown Plug Cost
Elder User
Joined: May 2014
Posts: 547
Likes: 1
From: Southern California
They are changing them so often to try to avoid problems of them breaking in or blowing out of the head.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
That's right, and I can also keep an eye on the boots and water in the holes, also the plugs might be sparking at 100k miles but the MPGs and HP are suffering. I can put my cheap standard 103's in in about an hour and the truck always runs like a champ. Plugs start degrading the day you put them in just like tires start wearing the minute you drive them out of the tire shop.
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
They can be run 100k miles in most cases, sometimes even longer. However in my experience performance suffers and misfires become more common once you get close to 50k miles. I can change plugs in my 6.8l for under $30. It is cheap insurance if you want your truck running at its best. So I change them every 5 years or 50k miles. Just R&R a set of plugs that have been installed for a long time can clean up the ground and help the engine run smoother.
Senior User
Joined: Apr 2011
Posts: 447
Likes: 1
From: Southern Oregon
Had it all checked in a shop in Mt. Shasta (town where I worked) and they confirmed the job was done wrong. Had a shop in Redding do the heads.....for me it was a piece of mine to have it all done since I was planning on full-timing with my 5th wheel.
Hotshot
Joined: Jul 2013
Posts: 14,211
Likes: 2,170
good question. I'll change mine when I get to the point that my truck does not start.
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