where are the o2 grounds?
Thread Starter
Launching!
Joined: Feb 2012
Posts: 281
Likes: 0
From: IL
thank you ed wright.
my car is having an issue where it stumbles, backfires, and/or dies under heavy acceleration and wot. the only codes i have are 0133 and 0153 for o2 slow response on both banks. i have long tube headers so i thought these codes were normal with lt headers. i replaced both front o2s recently, cleaned my maf, checked the o2 wires and no change. i dont think its fuel related because the car primes, starts right up, and drives fine under normal acceleration. i plan on doing a plug change this weekend but i doubt that will help much since im not getting missfire codes. the more i research this site for similar problems im having, im thinking it may be a result of the tune i recently got from madtuner (i had him tune out the rear o2s and egr so maybe somehow the front o2s were affected by mistake?). the car ran great for about 50 miles after i got my pcm back from him. im lost in all the "it could be this or that". im thinking about just taking it somewhere for a dyno tune instead of throwing parts at it.
i know you have tuning experience and i've read that you are mr. lt1, what do you think ed?
my car is having an issue where it stumbles, backfires, and/or dies under heavy acceleration and wot. the only codes i have are 0133 and 0153 for o2 slow response on both banks. i have long tube headers so i thought these codes were normal with lt headers. i replaced both front o2s recently, cleaned my maf, checked the o2 wires and no change. i dont think its fuel related because the car primes, starts right up, and drives fine under normal acceleration. i plan on doing a plug change this weekend but i doubt that will help much since im not getting missfire codes. the more i research this site for similar problems im having, im thinking it may be a result of the tune i recently got from madtuner (i had him tune out the rear o2s and egr so maybe somehow the front o2s were affected by mistake?). the car ran great for about 50 miles after i got my pcm back from him. im lost in all the "it could be this or that". im thinking about just taking it somewhere for a dyno tune instead of throwing parts at it.
i know you have tuning experience and i've read that you are mr. lt1, what do you think ed?
BB -
My 96 GM Service Manual says the BLK (i.e. - GND) wire on all 4 of the O2 sensors' heating elements ground at the ground point on the front of the Driver's side cylinder head, adjacent to the Ignition coil and IC Module.
The PNK (i.e. - B+) wire is HOT in Run and Start, while the TAN and PPL (or Tan / WHT and PPL / WHT) wires are the actual signal and return wires for the sensor portion of the O2 sensors, and (as Ed said), these wires only go to the PCM.
I hope this helps!
: )
My 96 GM Service Manual says the BLK (i.e. - GND) wire on all 4 of the O2 sensors' heating elements ground at the ground point on the front of the Driver's side cylinder head, adjacent to the Ignition coil and IC Module.
The PNK (i.e. - B+) wire is HOT in Run and Start, while the TAN and PPL (or Tan / WHT and PPL / WHT) wires are the actual signal and return wires for the sensor portion of the O2 sensors, and (as Ed said), these wires only go to the PCM.
I hope this helps!
: )
Thread Starter
Launching!
Joined: Feb 2012
Posts: 281
Likes: 0
From: IL
BB -
My 96 GM Service Manual says the BLK (i.e. - GND) wire on all 4 of the O2 sensors' heating elements ground at the ground point on the front of the Driver's side cylinder head, adjacent to the Ignition coil and IC Module.
The PNK (i.e. - B+) wire is HOT in Run and Start, while the TAN and PPL (or Tan / WHT and PPL / WHT) wires are the actual signal and return wires for the sensor portion of the O2 sensors, and (as Ed said), these wires only go to the PCM.
I hope this helps!
: )
My 96 GM Service Manual says the BLK (i.e. - GND) wire on all 4 of the O2 sensors' heating elements ground at the ground point on the front of the Driver's side cylinder head, adjacent to the Ignition coil and IC Module.
The PNK (i.e. - B+) wire is HOT in Run and Start, while the TAN and PPL (or Tan / WHT and PPL / WHT) wires are the actual signal and return wires for the sensor portion of the O2 sensors, and (as Ed said), these wires only go to the PCM.
I hope this helps!
: )
ok thats somewhat of a relief to hear. i rented a fuel pressure test kit today just to be sure its not fuel related and i'll be changing plugs and inspecting plug wires this weekend.
