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Discussion Starter · #1 ·
My buddies have same 4.0 motor and truck with 105000 miles on it and it's on original plugs mine has only 60k and I think they need replaced
 

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Nissan doesn't recommend changing them until 105K.

Unless you're already running something other than the stock plugs, there's not much point in changing them before then.
 

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Discussion Starter · #3 ·
Nissan doesn't recommend changing them until 105K.

Unless you're already running something other than the stock plugs, there's not much reason in changing them before then.
I feel like I lost power tho . Changed air filter . No vacuum leaks . I'm out of ideas
 

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You could have clogged catalytic converters that will cause a loss in performance that is hard to put your finger on...
 

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More details would help, have you lost power OVERALL, or just in certain ranges? Are you throwing any codes? Are you using really cheap fuel? Have you smelled the exhaust and checked for oil/coolant coming out? I'd pull the plug in cyl #6 and check it out (#6 is the easiest to get to... or was #4... either way.). Do some simple diagnostics before you give up.
 

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I did the plugs at 103,000 on both my Pathfinder and last Frontier and all twelve plugs still looked good. I doubt it’s your plugs.

Clint
 

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Discussion Starter · #8 ·
More details would help, have you lost power OVERALL, or just in certain ranges? Are you throwing any codes? Are you using really cheap fuel? Have you smelled the exhaust and checked for oil/coolant coming out? I'd pull the plug in cyl #6 and check it out (#6 is the easiest to get to... or was #4... either way.). Do some simple diagnostics before you give up.
It actually kind of feels like it's sticking in 2nd gear or something ? When I get up to 70 and let off the gas to coast downhill it stays at 3k Rpms. Like it's in a lower gear than it should be?
 

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Is your OD button switched off that's what it sounds like

Your way to high should be at about 2000-2250 somewhere like that and that's with cruising along not coasting if its a 4.0l with the 5sp auto
 

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I changed my spark plugs prob around 70- 80k and that’s only because I installed an IMS and had it all apart. By the looks of the plugs it was unnecessary but still easier to do at the time. If you really feel like there’s a problem, it isn’t that much work to remove everything in your way to check all the plugs.. I even remember someone saying they got to all the plugs without removing anything by using some extensions and swivels... can’t hurt to check, but that mileage is about half life on the plugs


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I changed plugs at 110,000 they still looked ok. However I did see increase in gas mpg after change.
 

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I call this the machine gun approach to repair. Close your eyes, shoot a bunch of bullets and hope you hit something. Don't do any diagnostics, swap out a bunch of parts and hope it fixes the problem.
 

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