Can a bad knock sensor cause poor emissions?
Thread Starter
Instructor
Joined: Feb 2002
Posts: 118
Likes: 0
From: Goodyear AZ
Can a bad knock sensor cause poor emissions?
Replaced the starter on my 86 today, and in the process destroyed the sensor in front of it. (Don't ask) Is this the knock sensor? I thought I would give it a shot and ran it through emissions, and it failed HC, Nox, and CO. On the way home, being a little upset, I got into it and noticed the knock. That was when I realized I screwed up the knock sensor (I had guessed it was the oil temp sensor 
) The entire emissions system in this car was replaced two years ago, and it passed fine. If it's not the knock sensor is there any specific component I can look at that would cause the above symptoms? I am trying to get this car ready to sell, and would like to minimize my outlay.
) The entire emissions system in this car was replaced two years ago, and it passed fine. If it's not the knock sensor is there any specific component I can look at that would cause the above symptoms? I am trying to get this car ready to sell, and would like to minimize my outlay.
Burning Brakes
Joined: May 2001
Posts: 895
Likes: 1
From: Austin TX
A bad knock sensor will screw up your timing, which I can see it messing up your emissions. I would go on to say it could make your car run rich if it is pulling timing and keeping the same amount of fuel coming in. Get that replaced 
