lack of top end power, can;t pass vehicles

[Freaker7113]

hey i'm having trouble with my 01 pathfinder, it seems to lack of top end power, cuz when i'm going around 100km/h then i go and try to pass a guy infront of my i go to gun it but all it does is it revs upp to about 5500- 6000 RPM and slowly increases the speed but the weird thing is it'll work just fine like 1 day out of 20 so here's what i think mught be the problem. i figure i need a tune up new plug ad prolly change the fuel filter. anyone have a second opinion??

[fueler]

i have that same problem (cant pass vehicles) but in my case its due to the severely underpowered 3.3L engine. is yours manual or automatic? im thinking maybe a transmission slipping problem?

[Freaker7113]

Auto.. i thought that too ... but i'll still do the tune up i'm due

[Adnan]

how does it behave on around town? is it only when you floor itthat it sticks?

[Empty V]

hey i'm having trouble with my 01 pathfinder, it seems to lack of top end power, cuz when i'm going around 100km/h then i go and try to pass a guy infront of my i go to gun it but all it does is it revs upp to about 5500- 6000 RPM and slowly increases the speed but the weird thing is it'll work just fine like 1 day out of 20 so here's what i think mught be the problem. i figure i need a tune up new plug ad prolly change the fuel filter. anyone have a second opinion??

I had this same exact issue with my 01 QX4. I had my fuel filter changed out and my MAF(Mass Air Flow) Sensor cleaned and it made a wold of difference. It felt like it did the day I bought it. It's cheap and doesn't require a mechanic's mind.

The only reason why I didn't is because I didn't know it needed to be changed out apparently this is maintenance that should be performed every 30,000 miles, I had 180,000 on mine!

Billy

[Freaker7113]

it behaves good in town.. its only when i decide to floor it... but ya i'll prolly be doing all that stuff next week and see what happens hiopefully its all it was and nothing to serious lol

[infinitiwon]

Trust me do what empty v say i cleaned my maf sensor and u would not belive the difference!! My qx4 seems three times as fast. lol

[Empty V]

Trust me do what empty v say i cleaned my maf sensor and u would not belive the difference!! My qx4 seems three times as fast. lol

The fuel filter is a big deal too. If it hasn't been changed in a long time you're most likely starving your engine.

[Buzzman]

When i'm going around 100km/h then i go and try to pass a guy in front of me i go to gun it but all it does is it revs up to about 5500- 6000 RPM and slowly increases the speed

OK, In my humble opinion, if the engine revs up to almost 6,000 rpm's, but you're still not going anywhere, then the problem is not the engine.At 100Kms/hr, the rev counter is usually around 2,400. If you step on it and the engine revs up, it should downshift and then take off.That's another important question to get answered here:Does it downshift for you at that speed? It should. If it doesn't, then I'm thinking transmission problem, not engine.Let us know.

[SixGuns]

Yeah, I have the same deal with my '04...plugs/filter may help a bit...but I've gone through my engine pretty thoroughly and everything is kosher...so here's my proposition to you...get on the interstate and drop overdrive off, letting the transmission fall back into 3rd gear, and accelerate from there. Don't romp on it too hard - these Nissan computers are kinda dumb and mine acted like it wanted to jump into 2nd gear at 65 when I floored it...but compare your acceleration between romping in 4th with the kickdown and just getting some in 3rd and I believe you'll come to the same conclusion that I did - the gearing in 3rd sucks ***. It's actually quicker, safer and easier on equipment if you just watch your mirrors, drop back a little bit and get a running start on your pass and just let the trans stay in 4th gear while you pass....for some reason, the truck wants to accelerate faster at 2-3k RPM in 4th than 5-6k in 4th..........which is very unnatural for a overhead cam engine...According to Edmunds.com the '04 Pathy put out 240hp (w/ auto) but the peak hp was attained at 6,000 RPM...if you look at a dyno chart for most engines, you'll see substantial gains are made in the mid-RPM powerband, and slows significantly near the top...so, slamming the engine to 6,000 RPM is great - but you're no longer building HP (read: you won't go any faster), and after peak has been attained, HP numbers drop off sharply.....it's just the nature of the beast...so, sure, by all means, check your gear out, make sure everything is good.....but IMHO, it's just the gearing and peak HP you're fighting...and you'll lose at that, unless you alter gear ratios, or add power (exhaust, performance chip, intake, etc.)....hope this helps a bit.