36,500 miles on my 03

 

I dealt with this for months after I put in 1000cc's and a fuel rail... We tuned the latency and scaling and couldnt get rid of it. Finally we spent some more time tuning and got it to go away. I think its prolly your tune.

 

i think ur prob right.

 

the p0171 is a result of your fuel trims being maxed out, more than likely at idle (this would be the low fuel trim in evoscan or mitsu logger). Just because the wideband reads fine does not mean the trims are not maxed out.

Get a tactrix cable and mitsulogger hook them up and do a short log of longterm trim low, longterm trim mid, short term trim. This will tell you if the trims are whacked at idle or cruise or both.

You can adjust the injector latency values to sort out the idle trims without affecting wot too much. If it turn out to be the mid trim (cruise speed) you will probably need to adjust the injector scaleing.

Hit me up via PM if you need help sorting it out. Should only take about 15 minutes if you have a tactrix cable and mitsulogger (I prefer mitsu logger over evoscan when it comes to fuel trims)

 

I do not have a tactrix cable, nor do i have mitsulogger or evoscan. i have wanted to stay away from these so i dont, for lack of better words, F$%K something up.

 

I've chasing the same thing for like a week or so. I've thrown 3 o2's at her and like TTP said IS THE TUNE. I suck at scaling injectors so is taking a lill longer.

 

Look at freeze frame data with a scantool. It will help you to understand what triggers the conditions to finally illuminate your light. I doubt its at idle. Freeze frame data will tell you vehicle speed, coolant temp, O2 voltage, short and long term trims, load etc etc. I'm thinking that its a tuning issue as all your issues started after the last tune, but you never know. Make sure you have no vacuum leaks and that all of your intercooler piping is secure too.

 

ok well i guess it has to be the tune. it was explained to me like this.....

Injectors are a funny thing. Injectors being maxed out just means that ur tune is wrong. As in, your fuel trims are wrong and "the tuner" never adjusted the trims, so the ecu keeps sending voltages to regulate the injectors and the injectors are like....wow im trying here ok. lol

Its like this, say you have ur TV and your reciever. Lets also say ur TV volume is routed through ur receiver at home before it comes out ur speakers. ill use volume as an example.

"tuner" tuned your reciever volume really low. Sure, its capable of like 500W but he turned its volume way down. Thats the trim. Now on ur TV volume, if you want say, more volume you turn the TV up. But its being scaled by that low reciever volume. So even though ur calling for more TV volume, and u max out the TV volume, it can only go as high as that reciever volume out to ur speakers. Its being trimmed and now ur maxing out the Tv volume and still not getting enough overall volume (fuel).

 

Did you ever get your misfire codes squared away?

 

nope! my car is a mess. yea its fast when its running right, but as soon as u pull a code (which is the next day after i re-set it) it drives like shiot

 

well my fuel trims are def not maxed out and even if they were b4, im still now getting this code. so next step is a new front o2 sensor. sucks i have to drop $250 on such a stupid part.

 

let me know if its your 02 im having the same problem

 

Trims may not be maxed out but if O2 sensor feedback is maxed out it will throw the code.

 

deadbeat did the new o2 fix the problem

 

Throwing code P0171 What should i look for or wat causes this code to be thrown?