missing O2 voltage

[ss94s10]

Well here it goes. Ordered keydriver e-prom. Sent the ECM to Terry Posten had socketed. All's cool there. Installed ECM back in to the car. So at this point I'm driving the car going "hell yea" car ran great for the first 20 miles. I did notice a slight difference in the idle thru the exhaust. As I'm drive I begin to notice a burning smell and my dash lights are getting real brite and now the battery lite and Brake waring lite are coming on at idle. So I think overcharging alternator. I hook my logger in I see sometimes 12 volts and sometimes 18 volts. Also my low fuel trim is like 139% other two are 101%. At this point see that my O2 sensor is reading 0.03. At this point I take the car back over to my shop park it to come back to it in the morning.I order a new bosch alternator(90 amp) get back together now it's charging great(13.5-14.0) but still no O2 action while driving but if you let it sit at idle the O2 will start moving almost normal. So my question is does this sound like a bad fuel pump or did the alternator take out the O2 sensor or is the ECM bad there are NO check engine lights. I'm going to check fuel pressure in the morning.

i have more information now. I could't find my fitting for my fuel pressure Gage set so I'm not exactly sure what fuel is but don't thank thats the problem. I have three logs that show the problem but I'm unsure how to post them here.Any time you have you foot on the gas O2 volt goes to zero. Take your foot off the gas and coast the O2 starts working kind of.Any way i did some 3rd gear pulls and get no knock and the car runs awesome but i still notice on a tip in to 1600 RPM it stubbles bad get past that and its a great drive. Took the ECM out checked for burns or burnt electronic smell nothing

thanks for reading all this and any help you can give.
Douglas

 

[toybreaker]

Did you get this fixed yet?

It's possible that overcharging to 18v (WTF ) took out the heater coil in the o2 sensor.

It would act somewhat as you describe. You should be able to check the coil resistance across the terminals at the o2 harness conector.

While you're there, with the key on, check for 12v and ground on the car harness side of the connector.

Good luck, and please post up what solves this issue

 

[ss94s10]

So far I installed a SAFC and now that I can control the fuel I've added +18% at LO-1000rpm
and now the computer is seeing fuel.

 

[toybreaker]

I'm not sure I understand...

Does the o2 cycle now?

When you add fuel with the safc, does the o2 show the change by gaining voltage?

 

[ss94s10]

yea, the O2 is cycling normaly and you can see the change in the voltage.