RE: When is a heated 02 sensor necessary ?

["Marteney, Steven J." <smarteney@xlvision.com>]

Sorry for the dumb question, but what's wrong with swings from 54mV to
900mV?  Should it be 0 to >1.0V?

Steve

-----Original Message-----
From: David Cooley [mailto:n5xmt@triad.rr.com]
Sent: Wednesday, November 01, 2000 4:11 PM
To: gmecm@diy-efi.org
Subject: Re: When is a heated 02 sensor necessary ?


At 03:47 PM 11/01/2000, you wrote:
>Hey guys. I just wanted to ask this question to get some opinions. It 
>looks like I might have to get one. I installed Edelbrock headers on my 
>L98 engine and the brand new 02 sensor I put in, swings from like 54mV to 
>almost 900mV at idle. I even got a "low 02" error code once from the ECM. 
>Would a heated 02 sensor help alleviate this ? Is one necessary when 
>putting headers on ?
>
>

If you have the output swinging like it should, a heated O2 won't help a 
lot...  heated O2's are needed when the sensor has to be farther from the 
exhaust ports and is used to pre-heat and maintain temp to keep it working.
Make sure you don't have any leaks on the headers, as a leak can suck in 
air and make the sensor read lean with a low-o2.  Also make sure the 
headers have a good ground...  If the ground isn't good the resistance will 
drop the voltage and make the low-o2 code as well.
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