EFIDynoTuning Forum

o2s look fine but the passenger hego is slow, how old is it? do you have any exhaust leaks?

fuel looks perfectly fine for stock

afr gauge should be reading actual now and not before since it was dumping oxygen in the exhaust before when it was misfiring

vspd isn't logging i don't have it setup to log in your crai8 adx

no point in comparing it to another log as thats rather useless
no, i've never found any reason to keep any logs and that could take up some space too eventually

as long as nothing on the dash turns red then you don't have anything to worry about just simply dial it in

Late yesterday, I saw visual evidence of an exhaust leak on the driver's side. The new Felpro exhaust manifold gasket looks blown out a bit at cylinder #8. I'm tearing into that sometime today.
I have one new o2 sensor, and one used. I have 3 more used ones to pic from in the event that the used one is slow or faulty. Passenger side (US) is the new one.
*Question: Can I totally undo one 02 sensor to determine which side is supposed to be which without damage being caused to the sensors? If I disconnect it, it should NOT report at all?*
The reason I asked is because of your statement in 2017 on EECtuning.org:
___"Re: 2000 5.0 ranger swap questions about EECV
___Post by decipha » Sun Mar 26, 2017 6:06 pm
___if one goes full lean and the other goes fill rich it means the hegos are swapped or pin mapped backwards
___I know the explorers have the ports assigned backwards in the stock tune, Ive never seen any others like that, in any case tell your guy to swap
___the ports"
I asked because now I'm using the 2000 Crown Vic pcm and the o2s are still wired the '97 Explorer way.
I'll get the leak fixed and check out the o2 sensor issue question/s and go from there.
Thanks again for your patience and input.

yeah you can unplug a narrowband its not like a wideband

I fixed the D side exhaust leak. The o2 sensor is responding differently. The RH sensor is unplugged during this 2 minute recording session.
It appears that the o2 bank numbering is correct.
*Question: On the laptop "dashboard" Is there supposed to be a decimal point to the left of the front narrow band o2 sensor numbers? Am I looking at volts below 1 volt?*
ADDED:After some research I have determined that the numbers must be millivolts.

After the shop workload bumped my personal project out of the way for several months, I'm happy to report that between replacing the faulty coil connectors, getting the affecting exhaust leaks fixed and totally replacing the two narrowband o2 sensors with new Denso o2s, the 5.0 is running well and the AEM afr gauge reads well in the mid 14s and bounces up and down that range quickly indicating to me that the new o2 sensors are working properly. The milage is good after driving it 400 miles over the last 4 weeks. Today will be the first cold weather test as we are below freezing here in north Alabama.