i lost alot of power ,went to nissan and they said nothing is wrong no codes. later i had the car dynoed at 181hp- 208ft-ibs i'm going to change the plugs next. anybody have an idea whats wrong?

 

Clogged fuel system????

 

How many miles on your car?

Also, sometimes the dyno may be calibrated wrong and give you wrong numbers. I would give it another shot at a different dyno and see if the numbers are acurate and if they are, take it from there.

 

i'm pretty sure it's right since my 1/4 is 15.1 at 89mph . here's the dyno [IMG] http://www.cardomain.com/member_page...e=10[/IMG]

 

the air fuel ratio chart shows my max as 17.5 at 3300 rpm then it skydives down to 11 at 3500 and hovers around 11 to 12 until fuel cut off, is that normal?

 

can you feel the power lost yourself? well..there is couple things you can begin to investigate:

1. exhaust leakage
2. clean throttle
3. clean filter
4. check your sparks, if they died get them replaced
5. get for codes again, reset ECU

 

yeah i can feel the power loss ,it's getting worse the more i drive the car,would the throttle be that dirty at 25,000 miles?

 

that's a lot of milage actually. although K&N suggest clean out the filter every 50,000mi, but i say if you clean it every 10,000mi it'll be better. never hurt to spend extra 30 minutes doing it.

and yes, clean your throttle body as well.

 

I know this may sound stupid, but make sure you are actually getting full throttle. I have a friend that experienced power loss due to his aftermarket pedal covers that secured behind the pedal and prevented the car from reaching WOT. Also, be sure your pedal stopper is secured. Have you had the power TSB done?

If none of those apply, I would check for a vac leak, see if TB needs cleaned and be sure to use premium fuel. From your website, it looks as though you have a Injen, so just be sure the filter is clean and all the hose clamps are secerely fastened and there are no leaks.

 

try tighten your throttle cable.

 

When I had my power loss it was because I was running super rich..

 

please no one follow these instructions

 

Hes on drive by wire....No throttle cables!

 

lol, made happyricefob sound like a noob

 

What were your last dyno numbers?

 

Haha!!! that's why he keep s breaking shyte.


Quansung: Could the MAF be going bad?

 

your dyno looks like a 4th Gen.. maybe your VIS isn't working

 

Thats a good thing to check

 

3 things come to mind, one is check the VIS for proper operation, next check the VTC if they aren't working that would cause a loss of power uptop. Lastly check your ignition timing, a malfunctioning knock sensor would cause the ecu to run less advance thus a power loss as well.

 

are all 4 wheels on the car?

 

whatever.

i don't care if i sound like n00b, being n00b, or gettin n00bed. everyone was once a n00b and perhaps still n00b at different aspect parts of the car. some people may have fully loaded intake exhaust drop rims etc, but doesn't know how to do oil change themselve. and now that's n00b.

anywayZ i want to back up what i said about tightening throttle cable. it's nothing fancy but just adds up your throttle's reaction time from the moment you step your gas pedal till the throttle body. if doesn't help then don't bother listening to me.

 

thats what they are saying though. there is no throttle cable on 2k2 and 2k3 maximas. the throttle response is controlled by the ecu. its known as the name drive by wire system. nissan currently has a tsb for the drive by wire for hesitation which includes a ecu flash. i also suggested the vis was not working a couple days ago in the same post in the 5th gen section.

 

oOo..i c i c.

well i don't know too much details about 5th gen, thx for keepin me knowledgeable

 

I guess no one wanted to read my post?!

 

u still make no sense it Drive By Wire

 

what's drive by wire?

 

To the newbie asking what drive by wire is:

 

here 's an update. after 4 months and 4 dealers found out one of the problems was multiple cylinder misfire so i had the coils ,spark plugs , injectors and throttle body replaced and cleaned and now i dyno 188hp at 4800rpm and 226tq .

 

if i were you, i would disconnect the vias and drive with it plugged. if the car feels the same then the intake is not working properly. i know 2k2-k3 are different than my 2k1 because i just have a line running into the midpipe that i can plug up. i thought i was having an issue because of a low dyno on hp but not on torque. i plugged up the intake so it would not work and it was noticably slower in higher rpms. maybe you can get your hands on a fsm and find out how to disconnect it.

 

Good luck finding the throttle cable on that sucker

 

Good call...you can activate it yourself by physically moving the linkage. WILLSE had a problem with his gasket on his IIRC...