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#1
12-13-2006, 04:00 AM
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O2 threads bad
hey guys.
I was replacing my O2 sensor and it must have been threaded in bad the last time it was done (i did not change it). The threads in the pipe are beat to hell. Do I need to take this to a muffler shop and have them replaced the pipes to the manifold or can I fix the treads with a tap and die? or can a muffler shop just weld in a whole new thread section into the pipe. Or can I just cross thread the hell out of it again and make it fit and jam it? or would that jack-up the reliability of the sensor readings if it's not in deep enought.
__________________
Old Chevy -1991, C1500 V6 4.3L 2WD Automatic, No a/c 220,000 Miles. 
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#2
12-13-2006, 06:19 AM
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Re: O2 threads bad
The threads pulled out when you removed the sensor.
You can rethread the hole with a spark plug tap
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#3
12-13-2006, 02:12 PM
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Re: O2 threads bad
i don't know that they pulled out, but must have been cross threaded when they when it went in last time. It was so jammed up I, thought i was going to break the sensor off inside it.
I will try the spark plug tap. Is it the same size,or how do I know what size to get.. Will I have to drill the hole smooth and then put in an insert and then tap it, our just re-tap it with the existing hole and threads that are there?? will that make it too big?
__________________
Old Chevy -1991, C1500 V6 4.3L 2WD Automatic, No a/c 220,000 Miles.
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#4
12-14-2006, 06:31 AM
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Re: O2 threads bad
Quote:
A spark plug tap or thread chaser for large GM 13/16 plugs. no need to drill, just run the tap thru
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#5
12-14-2006, 11:39 AM
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Re: O2 threads bad
Quote:
__________________
1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at http://www.silicon212.org/9c1! 2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness! 1967 El Camino L79/M20 old school asphalt raper Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.
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#6
12-15-2006, 10:27 PM
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Re: O2 threads bad
thank you Merlin.
I am just having a hard time tracking down one of those taps that's the right size. Im going to try napa or sears this next week. In the mean time, I just threaded it back in all half-assed and put some high temp sealer aroud it.
__________________
Old Chevy -1991, C1500 V6 4.3L 2WD Automatic, No a/c 220,000 Miles.
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