Re: 94 Blazer Catalytic Converter

Blaine- The artist formerly known as Plumber Crack "(OFMC)" /
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Don Wayne (Ofmc) Wrote:

-------------------------------------------------------

>

> If you have a second o2 sensor at the back end ,

> like some other car makers have, then yes it will

> " mess with the injection"

^ This is not true. The downstream O2 sensor (after cat) is there to determine cat efficiency. Under normal driving, it's reading is normally flat line. If the downstream O2 sensor starts mimicking the readings of the upstream O2 sensor, this tells the computer that the cat is no longer doing it's job. (P0420 or P0430 for bank 2)

It's the upstream O2 that continuously monitors the oxygen in the exhaust to dictate fuel trims.

Most cat failures are a result of engine misfires being ignored. The raw fuel and air being dumped in to the cat increases temps as it's trying to do it's job and results in a meltdown. Usually for the price of a set of spark plug wires, the cat would have survived.

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  94 Blazer Catalytic ConverterTopic by: ~ DeeZy ~ DeeZy 04/18/17 10:33AM
  Re: 94 Blazer Catalytic ConverterRe: Probably Fred Probably Fred 04/18/17 11:00AM
  Re: 94 Blazer Catalytic ConverterRe: Bad Cadillac™ Bad Cadillac™ 04/18/17 11:08AM
  Re: 94 Blazer Catalytic ConverterRe: Probably Fred Probably Fred 04/18/17 11:45AM
  Re: 94 Blazer Catalytic ConverterRe: Bad Cadillac™ Bad Cadillac™ 04/18/17 11:51AM
  Re: 94 Blazer Catalytic ConverterRe: Blaine- The artist formerly known as Plumber Crack "(OFMC)" Blaine- The artist formerly known as Plumber Crack "(OFMC)" 04/18/17 01:30PM
  Re: 94 Blazer Catalytic ConverterRe: ~ DeeZy ~ DeeZy 04/18/17 01:32PM
  Re: 94 Blazer Catalytic ConverterRe: Don Wayne (Ofmc) Don Wayne (Ofmc) 04/18/17 11:57AM
  Re: 94 Blazer Catalytic ConverterRe: Bad Cadillac™ Bad Cadillac™ 04/18/17 12:02PM
  Re: 94 Blazer Catalytic ConverterRe: cheetahchrome . cheetahchrome . 04/18/17 12:21PM
  Re: 94 Blazer Catalytic ConverterRe: ~ DeeZy ~ DeeZy 04/18/17 01:31PM
  Re: 94 Blazer Catalytic ConverterRe: Stephen Keller Stephen Keller 04/18/17 01:35PM
  Re: 94 Blazer Catalytic ConverterRe: Don Wayne (Ofmc) Don Wayne (Ofmc) 04/18/17 02:08PM
  Re: 94 Blazer Catalytic ConverterRe: Blaine- The artist formerly known as Plumber Crack "(OFMC)" Blaine- The artist formerly known as Plumber Crack "(OFMC)" 04/18/17 02:48PM
  Re: 94 Blazer Catalytic ConverterRe: Bad Cadillac™ Bad Cadillac™ 04/18/17 02:42PM
  Re: 94 Blazer Catalytic ConverterRe: ~ DeeZy ~ DeeZy 04/19/17 11:29AM
  Re: 94 Blazer Catalytic ConverterRe: Probably Fred Probably Fred 04/19/17 12:07PM
  Re: 94 Blazer Catalytic ConverterRe: - Dacruzer - - Dacruzer - 04/19/17 01:00PM

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