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1998 chevy k1500 5.7 o2 sensor replacment
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kandertonsr
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Oct 5, 2009, 1:05 PM
Post #1 of 10
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1998 chevy k1500 5.7 o2 sensor replacment
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i need to change the o2 sensors in my 1998 chevy k1500 silverado but cant find the upper ones i located the downstream ones. can any one help
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Hammer Time
Ultimate Carjunky
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Oct 5, 2009, 1:44 PM
Post #2 of 10
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Re: 1998 chevy k1500 5.7 o2 sensor replacment
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They are both right on the inside of the bend of the pipe a few inches below the flange.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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kandertonsr
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Oct 5, 2009, 2:58 PM
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Re: 1998 chevy k1500 5.7 o2 sensor replacment
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thank you found them but now i cant brake them free
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Hammer Time
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Oct 5, 2009, 3:11 PM
Post #4 of 10
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Re: 1998 chevy k1500 5.7 o2 sensor replacment
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If they are seized in, then you have a big problem. You will have to use a box socket and force them out. If it takes the threads with it, then your looking at a new "Y" pipe with converters and that's big bucks.
You'd better make sure that you even need them. I'll bet my bottom dollar that they are misdiagnosed as your problem.
If your changing them because of a code, what is the exact code number?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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webbermacman
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Apr 24, 2010, 6:21 AM
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Re: 1998 chevy k1500 5.7 o2 sensor replacment
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You can always use some heat to get them out. Just get a torch of some sort and heat up the area around the sensor and then start the loosen the sensor.
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Hammer Time
Ultimate Carjunky
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Apr 24, 2010, 7:39 AM
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Re: 1998 chevy k1500 5.7 o2 sensor replacment
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I've never found heat to work on an 0/2. Once they seize, adding heat will just bring the threads out with it.
Sometimes an exhaust shop can weld in a new threaded piece to the pipe.
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nickwarner
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Apr 24, 2010, 8:45 AM
Post #7 of 10
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Re: 1998 chevy k1500 5.7 o2 sensor replacment
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I'm with HT there. Those threads get wrecked easy. I've had success in the past welding on a new threaded piece, but the pipe has to be pulled out of the truck to be able to do it. Make sure the sensor is truly bad before you do this or you're just wasting money
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webbermacman
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Apr 24, 2010, 4:45 PM
Post #8 of 10
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Re: 1998 chevy k1500 5.7 o2 sensor replacment
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I just did it and it worked! 
Not saying your ideas may have to come into play at one point. Heat works. Used it in a shop for many years on exhaust parts. If it's hot all the time why not get it back to it's natural state, (since it's a heat-type of O2 sensor)
Hope everyone doesn't have to weld or replace that part! I have had to replace a lot of things on me truck so far. Hoping that I don't have to replace much more except wear parts! 
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Hammer Time
Ultimate Carjunky
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Apr 24, 2010, 5:00 PM
Post #9 of 10
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Re: 1998 chevy k1500 5.7 o2 sensor replacment
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I also have used heat on exhaust systems for many years but there is something about an 0/2 with the metals they use that if it gets to that point, it welds the threads together and using heat just softens them. Every time I have tried it on a seized O/2, it just pulled all the threads out with the sensor. I've found that if it doesn't come out cold, it's not coming out at all.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Apr 25, 2010, 5:06 AM
Post #10 of 10
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Re: 1998 chevy k1500 5.7 o2 sensor replacment
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To add: Heat used when you know the sensor is going or it would kill it. Check threads, if needed spark plug taps can re-thread pipe on some anyway,
T
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