16.679 Volt spikes coming from O2 Sensor

[ForeverDriven]

Title says it all. The 97 GT I just bought a while back recently threw a rich code when driving, then developed a pulsing/surging in 5th gear at the same time. No matter if I clear the code, the pulsing/surging in 5th is always there, and idle randomly gets really rough. Code is p0175.

Here's the real problem though, I had just replaced another 02 sensor that was spiking as well, but this sensor was spiking within what you'd consider possible for a 14 volt system (lower than/around 14 volts).

The shop said the sensors looked OEM, so I'm going to replace all the others and run it for a couple weeks while constantly clearing codes.

Any thoughts or previous experiences would be awesome!

Thanks,
Blake

 

[01yellercobra]

I'd start by switching the sensors side to side. See if the code follows the sensor or stays on the one side. My guess is you're going to be chasing wires for shorts or something.

 

[07GtS197]

In addition I would check the alternator. I’d say its probably on its way out.


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[ForeverDriven]

In addition I would check the alternator. I’d say its probably on its way out.


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Alternators near brand new!

 

[07GtS197]

That doesn’t mean its not bad. Alternators for these cars are hit or miss, I personally have had a remanufactured one not work within a week of installing it. 16 volts doesn’t come from nowhere, its coming from the alternator.


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[ForeverDriven]

That doesn’t mean its not bad. Alternators for these cars are hit or miss, I personally have had a remanufactured one not work within a week of installing it. 16 volts doesn’t come from nowhere, its coming from the alternator.


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Gotcha. If I got it tested would it show this type of problem?