acceleration issue..

[Destructo1]

Shifts perfectly at any RPM up to 4300.. flooring it, it will reach about 5000-5300 RPM and will not shift! what in the world could this be?! Just replaced Mass airflow sensor!!! Solved the issue for a bit, but is no longer working..help ASAP!!!!!!!!!!!!!!! NO SES light is on!!!!!
Modified by Destructo1 at 11:25 PM 2/4/2010

[Destructo1]

Modified by Destructo1 at 12:09 AM 4/4/2010

[Destructo1]

I have replaced the MAF sensor, plugs, coil packs, filters, o2 sensors, and still don't have the "normal" acceleration. My buddy has an 2002 SE, I drove it once and the 3.5 hauls a**. Mine just simply doesn't accelerate like his. I refuse to take it to the dealer unless i absolutely have to. I have dumped ridiculous money into this issue... and it isnt solved. I recently check the vacuum cut bypass valve pump on the charcoal canister, cleaned that, and it helped a ton, but it still isnt right.. any thoughts? I dont know where to go anymore.. i had the injectors cleaned and have tried gas solutions... I just wish mine hauled like his.. and not to mention like 12 MPG driving around.. no SES light.. only bank 1 lean.. once in a while, but it just goes off... any help or thoughts would be greatly appreciated.

[Infinitiguy19]

So there are never any codes even with one bank being lean sometimes?

Check the codes when the bank leans out.

[Destructo1]

occasionally the "Evap emission control system leak large" will come on.. PO455, but it will just go off. it's bugging the hell out of me! ive cleaned the pump and as much of the canister as possible. do you think i need a charcoal cleaner through the evap lines? idk what to do anymore!

[Empty V]

When was the last time you changed your fuel filter?

Billy

[alexf20c]

his truck is faster than yours. deal with it.

[Destructo1]

Let me just say this... you're an idiot. You're on a car enthusiast website and you're trying to say that two stock engines are faster than one another? They are identical engines (3.5), the only difference is his is a year newer and mine has 20,000 miles less than his. Your claim makes no sense at all! ifyou want to be an ***hole, don't respond!I have an issue that I am trying to get feedback on. You apparently know very little about cars, or pathfinders for that matter. So for future reference, don't respond with some half a** answer. have a great day, d!ck.

[Destructo1]

yo man, thanks for the suggestion.. I have replaced the fuel filter twice now, air filter, and some other odds and ends. I clean the vacuum bypass valve quite a bit and it helps, but only for a couple weeks at a time. I dont know whats wrong.. i think i am going to have to go to the dealership and see what they say. I'm running out of options and patience on this one. I know my truck has better acceleration and MPG than what it has now/ getting.

[alexf20c]

Let me just say this... you're an idiot. You're on a car enthusiast website and you're trying to say that two stock engines are faster than one another? They are identical engines (3.5), the only difference is his is a year newer and mine has 20,000 miles less than his. Your claim makes no sense at all! ifyou want to be an ***hole, don't respond!I have an issue that I am trying to get feedback on. You apparently know very little about cars, or pathfinders for that matter. So for future reference, don't respond with some half a** answer. have a great day, d!ck.

you're right. i know very little about cars, especially pathfinders.

just because they have the same engine does not mean they will perform identically. there are many variables involved, such as tire size, tire make/model, wheel size, final drive ratio, 4x4 or 4x2, and all the different options that you or the dealer may have added.

if you insist that there is something wrong with your vehicle, take it to the dealership. feel free to pay them $100 to tell you there is nothing wrong with your vehicle.

in fact, it may be that there's something wrong with your friend's vehicle. worn suspension (shocks/struts, springs, bushings) will cause nosedive and squat, which will make the vehicle feel like it is accelerating or braking more aggressively. unless you have accurately and precisely timed the acceleration of the two vehicles, side by side on the same day on the same road, then who's to say that yours only FEELS slower?

surely you have more to go by than "his feels faster"? if you don't, we can not help you here.

you can continue to blindly throw parts at your pathfinder in a futile attempt to regain this supposedly lost horsepower, or you can deal with it.

you tell us you have an O2S Bank 1 lean reading. well why don't you f***ing fix it? if your oxygen sensor is reading lean, then obviously you have a fuel/spark issue that the computer is not picking up. simply because the code will clear itself, it does not mean there is not an intermittent problem. too lean an air/fuel mixture will definitely cause a loss in performance.

you say you already dumped ridiculous amounts of money into your vehicle. have you replaced the $11 fuel filter, the $8 air filter, $20 distributor cap and rotor, $69 plug wires, $50 spark plugs, $4 PCV filter? have you ever done a basic tune-up? i doubt it. yes, i know you say you did, but i still doubt anything was ever done. i don't doubt, though, that you've tried things like quad-tipped spark plugs, Tornado air intake elements, and some octane booster.

your last option is to keep throwing parts at it blindly, and keep asking the same question over and over, on the different nissan forums, until you get the answer you want.

don't lecture me on car knowledge when you obviously know nothing on the subject.

[alexf20c]

Quote »it isnt the transmission because...[/quote]well why do you need us? you obviously already know what's wrong with your vehicle. replace the transmission.

[alexf20c]

man you're a good guesser! you should be a mechanic!

you were spot on about the timing belt. the timing belt is a known culprit for a transmission that doesn't upshift.

[Empty V]

man you're a good guesser! you should be a mechanic!

you were spot on about the timing belt. the timing belt is a known culprit for a transmission that doesn't upshift.

Alex stop being a d!ck. Change your fuel filter and clean your MAF. If that doesn't help it could be a lot of other things like the TPS or the torque converter.

Billy

EDIT: Forget my reply as I now see that you have 3 threads on the same exact topic. Mod(which we don't have any) please erase 2 of them.
Modified by Empty V at 4:39 PM 4/3/2010

[Buzzman]

Mod (which we don't have any)

Right on. Just exactly who IS our moderator, and where the hell is he?We could use someone once in a while to monitor the activity and clean up some of the crap we get on this forum.

[Pwnin O'Brien]

As much as I hate to admit it, I have to agree with alexf20c on this one (sort of). There are so many different variables when you compare two of the same vehicle. Even if you completely disregard any changes in features and options between that one year difference, you still have to take many things into account, most of all the drivers. Something as small as the type of gas (more specifically, gasoline detergents) used during the past year can make a huge difference. A persons driving habits will affect their car on many different levels. When you are comparing two vehicles which are eight and nine years old there is a huge margin for error.

To address your poor acceleration: you should start by fixing the DTC code, even if it is intermittent. A perfectly running vehicle should not get any DTC's. Once you address that issue you can tackle other issues. There are small jobs which you should try first (most of which you have done) such as spark plugs, PCV valve, fuel filter, air filter, engine oil, trans oil, diff oil, transfer oil. A lot of people have had a lot of success with Seafoam, that might help a little as well. There are some other jobs which require a little more work and expertise such as getting your injectors cleaned (removing from vehicle and then cleaning) or checking to make sure your power valves are all in place or even cleaning the throttle body (that's a pretty simple one). You also want to ensure that there are no vacuum leaks, that will cause an erratic idle. The EVAP system will not hinder your performance in any way at all. The only point at which the EVAP system interacts with the engine is at the upper intake collector, where it uses the engine vacuum to purge the EVAP canister.

Another spot where you can lose power is at the fan clutch, if the fan clutch is failed it may be at 100% duty all the time, using up horsepower and reducing you MPG. If you can turn the fan with the vehicle off and it spins about 4 times then it's fine.

There are LOTS of places you can lose power, you really just have to go one-by-one and eliminate each possibility.

[Ubel Feuer]

Yea my dealer doesn't charge for inspection, so when I think something is wrong I just have them look.

Whatever you do, the hour fee they will charge is worth it if you get a correct diagnosis.

[alexf20c]

well you're lucky because i've yet to hear of a dealership that doesn't charge for diagnostics.

[Destructo1]

hmmm.. well, if i dont think its the transmission, is that it really a valid interpretation to say i should replace it? hmm... good job, bud.

[Destructo1]

thank you. this was the type of response I was looking for. I understand there is variability from engine to engine, but not enough as what exists in my comparison. you're a great help.

[Destructo1]

i realistically have no idea who you think you're talking to. All i am looking for is relativity, people who have had similar circumstances, or feedback. I don't need your s***ty f***ing responses.

[alexf20c]

you realistically have no idea who i think i'm talking to? realistically? REALISTICALLY?

realistically, i'm talking to an 18-year-old douche bag that's so stubborn that he will continue to ask the same question until he gets the answer he's looking for, no matter how far from the truth it is.

or were you threatening me, like, "you don't know who you're messing with"? get real, your e-threats are laughable and useless. what next, are you going to tell me you're flying down to Texas to kick my a**?

well we don't need your s***ty f***ing threads.

we told you what's wrong with your truck and/or your head. don't get mad at us because we didn't give you the answer you were looking for.

[alexf20c]

awww, the little douche bag deleted everything from his first post so that nobody will know how much of a dumb a** he is.

good posting!

i recommended replacing the transmission because it keeps with your style of car repair - just blindly and ignorantly throw parts at the car until it gets fixed, or you think it has been fixed. hey, maybe the poor shifting is caused by a dirty in-cabin air filter! let's replace that!

[Destructo1]

actually i was attempting to delete the repeated thread seeing as how I am taking up space and it was requested. Sorry I don't know how to delete something correctly...?

I don't know where your basis is of random repairs? Every repair I have made is relative to one another... so thanks?

You don't need to reply to my questions or responses either since i am an ***hole, douche bag, dumb a**, whatever meaningless word you decide describes me...

[alexf20c]

ha! you used profanity first, you f***ing hypocrite.

and your repairs are not related to anything but your stupidity. so did you replace the timing belt yet? i heard it was causing poor shift quality on your pathfinder.

[01silvapathy]

You b

ha! you used profanity first, you f***ing hypocrite.

and your repairs are not related to anything but your stupidity. so did you replace the timing belt yet? i heard it was causing poor shift quality on your pathfinder.

You better be careful arguing with Alex, he might get so pissed that he would take you off of his friends on Facebook

[01silvapathy]

Epic Battle Yo!

[alexf20c]

mad? not really.

but you're pretty f***ing annoying.

[RED_DET]

alexf20c,

It seems that from reading over your posts that you are knowledgeable person but for whatever reason feel the need to answer in belligerent ways occasionally. I don't know why exactly but consider this your warning and maybe you should think about what you type out before you hit enter.

Next ignorant comment from you will be a vacation.

To the OP, please don't make separate threads about the same topic.

[alexf20c]

I told the OP what might be wrong with his truck. He didn't like my answer. He called me an idiot, an ***hole, and a d!ck. I guess you missed that part. Have a nice day.

[Empty V]

Next ignorant comment from you will be a vacation.