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Hot, Warm or Cold?

 
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Bill58
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2006 Chevrolet Impala
2005 Chevrolet Impala


PostPosted: Sat Jun 22, 2013 10:15 am    Post subject:  Hot, Warm or Cold? Reply with quote

'05 3.8 p0036 cel.
I need to change the downstream O2 sensor as the heater circuit has 4.7 M ohm - should be around 20 ohm.
Should the exhaust system be hot, warm or cold when removing the sensor?
Thanks
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gdoggy
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PostPosted: Sat Jun 22, 2013 10:25 am    Post subject:   Reply with quote

Every O2 sensor I've replaced was done while the engine and exhaust was cooled overnight. Maybe I'm lucky, but I had no problems during the replacements. I used a rented O2 socket from an auto parts store.
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Lingenfelter
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PostPosted: Sun Jun 23, 2013 9:13 am    Post subject:   Reply with quote

The dealer broke my downstream02 when they removed it "to check" something. The car was at least warm, possibly hot. So my single experience suggests cold.

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Bill58
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Location: Maryland

2006 Chevrolet Impala
2005 Chevrolet Impala


PostPosted: Mon Jul 01, 2013 10:21 am    Post subject:   Reply with quote

Thanks to Lingenfelter and gdoggy for input.

The reason i asked is the service manual states:
"Removal Procedure Notice: The oxygen sensor may be difficult to remove when the engine temperature is below 48C (120F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe."

I drove on ramps and removed the downstream O2 sensor so the pipe was barely warm. Downstream sensors seem much harder to remove than upstream sensor. I used pb blaster for a week prior to removal and still needed two 7/8" wrenches end to end to get enough torque. The threads weren't pretty but after chasing the threads the new O2 is in and no codes or pending after three days.
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gdoggy
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PostPosted: Mon Jul 01, 2013 11:42 am    Post subject:   Reply with quote

Bill58 wrote:
Thanks to Lingenfelter and gdoggy for input.


No problem. Glad you got it replaced. I actually replaced my upstream sensor last week after my car sat overnight. Other than dealing with the lack of room at the firewall, everything went smooth and the sensor came right out.
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