New headers installed but car wont start

[cueball89]

Where in NY are you? Are the battery terminals tight?

[Snitko13]

so i just tried to disconnect the battery for 30+ min and still nothing

[Snitko13]

Originally Posted by cueball89

Where in NY are you? Are the battery terminals tight?

im in rochester and yes they are tightened down

[FRS13_]

Try this.

http://www.ft86club.com/forums/showthread.php?p=3219936

Sent from my SM-G892A using Tapatalk

[steve99]

Originally Posted by Snitko13

Hey, so I just recently got a 2013 brz back in March and finally was able to start modifying and just now installed invidia n2 fatback, front pipes over pipe and tomei uel headers. And when I go to start the car too see how it sounds, it starts but dies literally right away. And something doesnt make sense. The car was running perfectly fine before and all I did was change the exhaust. Do want to note that when I tried to disconnect the o2 sensors (wire connector side) when troubleshooting it would run and stay running but after a few seconds the rpms would start to jump between 1000-1500 rpms which I would say it's normal since no o2 sensors were connected. Also did put on some anti sieze on the threads of the o2 sensors and maybe some got on the inside without me knowing but none of this makes sense and tried to find something online and absolutely nothing. So some suggestions would be nice

The car should run fine on stock tune


You dont need to reset ecu



If the car wont stay running you have left something unplugged, either electrical cable or hose or you have damaged a sensor or wiring.

[Snitko13]

Originally Posted by FRS13_

Try this.

http://www.ft86club.com/forums/showthread.php?p=3219936

Sent from my SM-G892A using Tapatalk

i gave the method a try that they explained but didnt work. worth a try but thanks for the link

[Snitko13]

Originally Posted by steve99

The car should run fine on stock tune


You dont need to reset ecu



If the car wont stay running you have left something unplugged, either electrical cable or hose or you have damaged a sensor or wiring.

thats what im thinking. ,im gnna get new o2 sensors tomorrow and give that a try and hope it works

[steve99]

Originally Posted by Snitko13

thats what im thinking. ,im gnna get new o2 sensors tomorrow and give that a try and hope it works

Hmmm that might be very expensive. You rearly need to test them first they may be ok.


Did you touch intake at all or any intake hoses .


The car should run with 02 sensors disconnected, will go into limp mode but should run.


You symptoms could be a big intake leak or intake hose disconnected

[Snitko13]

Originally Posted by steve99

Hmmm that might be very expensive. You rearly need to test them first they may be ok.


Did you touch intake at all or any intake hoses .


The car should run with 02 sensors disconnected, will go into limp mode but should run.


You symptoms could be a big intake leak or intake hose disconnected

it does run without the o2 sensors connected. but i will check the intake area and see if anything is disconnected somehow

[Snitko13]

so idk if this matters but i tried to see if the car would run with only one o2 sensor and it does. its the one closest to the overpipe (one with black connector). might mean the other o2 sensor is bad. idk

its able to idle perfectly and go down to normal rpms at around 700 when it gets warmed up. but when i try to give it throttle it starts to die but stays on when i let go of throttle

[steve99]

Originally Posted by Snitko13

so idk if this matters but i tried to see if the car would run with only one o2 sensor and it does. its the one closest to the overpipe (one with black connector). might mean the other o2 sensor is bad. idk

Click link


Go to engine hybrid system


Engine control


Then air fuel ratioo sensor ie front sensor
And heater o2 sensor ie rear sensor


Test as per instructions


These sensors are like $200 each


Test before replacing



https://demos.starbase7.net/t3Portal..._rm_index.html

[Grey86]

I think you've damage the o2 sensor while changing the exhaust, they can be very sensitive, with a slight knock they can be faulty. but still doesn't explain why the car shuts off right away since you can run fine with only one.
long shot but are all the grounds connected? have you accidentally swapped any plugs, or accidentally have the o2 sensors cables swapped around ?

[Snitko13]

so now after the car was running perfectly fine for a couple min with only 1 o2 sensor, it died on its own and now its only cranking

[Snitko13]

Originally Posted by steve99

Click link


Go to engine hybrid system


Engine control


Then air fuel ratioo sensor ie front sensor
And heater o2 sensor ie rear sensor


Test as per instructions


These sensors are like $200 each


Test before replacing



https://demos.starbase7.net/t3Portal..._rm_index.html

ill give it a shot