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Discussion Starter #1
On my 89 F150 w/5.8 swap.

Ok So I installed a new o2 sensor in the custom Y pipe that was made for my truck. One thing I noticed is at Idle the o2 sensor is reading but when you rev it up it stops reading...or nowhere near the .1-1.0 v I am currently stumped. Do you guys have Ideas on what I should check? I have checked TPS and that is at .944 closed and 4.54v open.

https://youtu.be/HasqFLUGhWA
 

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Discussion Starter #3
What was the running symptom that made you diagnose the HEGO, and what tests did the old one fail? Did the new one pass the same tests? What is the current symptom that made you try to diagnose the new sensor?
http://www.supermotors.net/registry/media/507315
I had a code 41. I just got the exhaust done on this truck. Was having a weird part throttle issue, it felt "heavy" if that makes any sense but sometimes it would clear up. The old one was not getting any reading and I believe that was my fault as I was running it with open headers pretty close to the collector and I THINK the cold air might have killed it. When the exhaust was built I had an o2 bung placed where both pipes join. I didn't think it would be an issue placing it there as it is a heated o2. I can get a pic of the location in a bit.

I am running longtube headers from pacesetter and had a custom 2.5 y pipe for the truck.

 
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