Mud in my Veins
Join Date: Mar 2000
Location: Paducah, KY
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Re: oxygen sensor?
Norm, I just replaced the o2 sensor on my Blazer yesterday. REALLY easy. My truck has 88,000 miles on it, and I could tell mine needed replacing. O2 sensor was quite rusty (not that it matters, but you could tell it was the factory one). The only way to tell if it needs replacing is if you are getting worse mpg's than you think you should be. My truck should be around 13-14 mpg, and it was getting 10-11 mpg for the last year. Hopefully this should be the cure, because I have checked just about everything else.
Hopefully your truck has the single wire o2 sensor like mine does. If not, you have the 3 wire. Only real difference is that the 1 wire Bosch costs 24 bucks at AutoZone, and the 3 wire is like 54 or so. Still, for the amount of work, and the relatively low cost, it's worth it.
Oh yeah, and you may want to run the truck for like 3-5 minutes before you attempt to remove it. It just did not want to come out of the manifold on mine. Then I remembered that someone had said on here to run it for a few minutes. I ran it for like 3, and my buddy was able to get it off with just a little effort. Maybe a few more and it would have been easier. Just be careful to not burn yourself on the manifold. Hope this helps.
1992 Blazer Sport, 350 TBI, Gibson 3" cat back, 4L60, K&N, Rancho 3" lift, 285/75R16's on 16x8 Bajas [img]/wwwthreads_images/icons/laugh.gif[/img]