Got my o2 sensor today! Yah! All i have to do is clip harness and crimp wires and thats it. It also came with some stuff that is bronze, like a paste. What is this for? Threads?

 

seek pro. help

 

Actually it was quite easy. New sensor had 4 wires (2 black 1 blue and 1 white) as did old one. Just cut and splice & crimp and your done. Well except plastic heat covers (which you melt with lighter or any other type of heat). Started the car up and it started fine came back down and almost stalled. Then engine started jumping kinda; like it was on only 2 pistons. At first i got scared and turned it off, took the plugs out and check em. Ive been running rich or lean which ever but its been destroying my plugs. Cleaned em, put em back in. Started car again, same thing jumpin like crazy; like the motor was rocking. Well anyway i decided to wait and see if it was the ecu learning new sensor. Well after about 20 seconds it just died. I started it again and it was fine. I guess it was just learning. Anywho its idleing now (whole 15 min deal) then im going to take it for a spin (under 3k ofcourse). Here are some pics of my work......

 

Well it happened again. Not immediatly. Heres the story.... I waited for the 15 min idle period, finished. Took car for a drive approximatly 30~40 Minutes. Car ran fine, i didnt boost during the first 15 minutes, actually i waited like 20 min. Anyway, car is running fine, boost is pretty nice, still not optimal, kinda slow @ high rpm, prob fmu (b/c ive taken it apart twice to check it, but i put everything back). Well no sputters or anything on the whole drive. I get home and decide to try the a/c (i waited to get to my house b/c i thought it would f up). A/c is on, idle immediatly falls out. I take car around the yard, starts to choke and sputter like crazy. And rpms were jumping everywhere. Any ideas?


Car is idling fine just now. I let it cool down for a while. When i cranked it i ran it up to like 4.5k slowly to check for sputter, nothing happened. So does that rule out my plugs? I also reset ecu.

 

wait wait wait.......did you just say you crimped together the o2 sensor wires?

dude, you NEVER crimp anything as serious as that. solder it. i think you need to get some professional help as someone pointed out, your grabbing at straws and i think its gonna end in "kaboom!"

no offense man, but its kinda obvious you don't know what you got yourself into and although boe is a lancer diety, i don't think him talking you through it is gonna solve your problem

 

The only thing you need are oem O2 sensors. You shouldn't need to go all fancy. They say the O2 sensors are bad, you change it with OEM. You'll never find out the problem if you always take shortcuts... How about your battery? Have you changed it after 100k miles already on the odometer?

 

No way; they were butt crimps and i checked them very well, they were extremely secure and on top of that had a shrink wrap on top of them. I think they are secure. Plus my SES light is off and has yet to come back on so i think i did something right.


Also this leads me to believe that it is either a fuel problem or bad plugs. I had them foul out on me just before i changed o2, like at the store before i came home. I had to pick out of my 4 sets of plugs i had changed this week (all bkr7e) to get the best looking ones. So maybe a spark plug problem? They are all gapped right but have black on the bottom threads and the white tip. Sorry not trying to miss treat my car but these are all the plugs i had and they weren't that bad.

 

Yes i have changed battery once already. And to add i had to tighten the alternator belt just a second ago when i checked for SES light. It was squeelin on start up.

 

Also they are the SAME oem sensor you buy from oxygensensors just without the harness. I called the guy to confirm this and like i said the ses light went out. Ive ran it 3 times and no ses light yet. (knock on wood)

 

So everything is good now except when you turn on A/C then it acts all crazy?

 

Well i dont know but yes that is the only time it has acted up. Like idle is just really low; i cant even hear it sometimes, i have to make sure im not stalled. And when you start to drive thats when it goes all wild on ya.

 

Did you install the SRI correctly with all the plugs of the sensor (the waffle looking thing). Make sure when you install this waffle be careful you don't bent it and it will only go one way. This part is very sensitive. Anyway, you installed the o2 sensor so why not do another OBDII scan?

Your car is acting crazy due to the fact your sensors aren't calculating the right A/F ratio then it starts to go crazy. Well your car still runs so I guess your ecu is still ok. It's just that the sensors are giving out wrong numbers so the engine gets the wrong amount of fuel. This is just my speculation, boe or the other guys might have better answer...

 

But i have no ses light. Can they still scan for other problems?

 

That's the purpose of the OBDII scanner. It outputs the problems gathered by the ecu...

 

The scan tool can scan realtime... even if a code isn't pending or appeared you can see what the sensors are reading. You can see your MAS reading, O2 sensor readings, Fuel trims, and best of all if your in close/open/limp mode. Seeing these things is a major part to diagnosing problems with OBD-2 cars when all else leads no where.

You can only go so far with todays cars by using fundamental/advance mechanical knowledge. At some points you have to be able to see what the car is saying is wrong ang search for the cause with that knowledge. Hearing it studer and seeing black plugs is a tell tale of being rich... but why... could be O2 sensor bad, could be bad MAS reading, could be in limp mode, etc... without knowing which you could chase your own tale around.

In order to be a good mechanic you need to have all the info to diagnose the issues fully.

Try going to digimoto.com and picking up that scan tool. It's been the cheapest i could find and does about everything the expensive ones do and more. It's what i use to tune on cars. The lancer is ISO format... just incase you do want to get it let them know that.