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Discussion Starter · #1 ·
2006 SE,
4.0L
6 speed man
157K

Questing on fueling.
I've had truck for about 8K. Has always ran like current so I can't compare.

No codes
Cats are new
Compression good all 6 cylinders
plugs newish
air filter good
all stock/no mods
Idle 675
no hesitations
MPG- 20 highway

Symptoms
accelerates flat 2000-3000 RPM. Feels like it has plenty of torque but adding fuel doesn't seem to react how I feel it should. Like the truck is forgetting i'm the boss and gives the fuel what ever it thinks
Like it lacks the horses.
I can pull a small trailer with no problem but feel its the torque doing the work if that makes sense.
I realize its a heavy vehicle but confused as to its lack of response.

Maybe it needs to be remapped?
I don't know if Nissan has these trucks run like this for better fuel economy and its just a nani control.
I would check the fuel rail pressure but that is a project with no quick access.

Any ideas what I should be looking at?
 

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Same clutch? I read here that if the clutch job is botched, the truck will bog. Not sure why.
 

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My truck ('10 4.0L 6spd) feels a bit sluggish in 6th at times.

Oddly with cruise control engaged it feels more powerful. The accel switch is very responsive and it has no trouble maintaining speed.
 

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Did '06s have WOT restriction?
 

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Did '06s have WOT restriction?
Yes. Sounds like this is the issue. The truck will not provide 100% open throttle until ~40mph (I think that is the speed). I forget the exact throttle percentages it allows at what speeds but it's something along the lines of 40% throttle to 20-25mph and 60% throttle from 25-40mph. Don't remember the exact numbers but that is the gist of it. If you don't like it, go buy a plug and play tuner and disable it.
 

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Discussion Starter · #6 ·
Ok that makes sense.

That's frustrating. These trucks need to have an option to shut these nani controls off.

I would imagine tuning it without the restriction would feel like a new truck.
Going to look into that.

Thanks
 

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I had one for a while and it definitely makes for a more "spirited" driving experience. Decided it really wasn't something I had to have though and ended up going back to stock tune and sold the programmer. I haven't missed it since. Really depends on your preference.
 

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Not really. Lost slightly over 1 mpg maybe. I was just cleaning out the garage and saw the tuner laying there in the box and decided I didn't need it so I just tuned back to stock and sold it for some extra cash.
 

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Yes, HitecRednec, I can feel an extra push come on line between 35 to 40 mph in my '06, much like a turbo that has spooled up and suddenly adds boost. I've never minded this "feature". My truck feels plenty quick with the 6-Speed and perhaps the "feature" helps preserve the rear end from a bit of mechanical punishment.
 
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