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'95 metro, '91 miata, 2000 ranger.
Oddly, the ranger didn't throw a CEL. The older ones don't know any better.
Not sure you need to clean your grounds? check for a voltage difference between the alt case and the negative battery terminal, between either and the chassis, with the engine running. You want it as close to zero as reasonably possible.
Having a weak ground will affect the reference voltage going to your sensors. If it's bad enough, you start getting things grounding through each other, like my turn signals in the ranger, at which point weird things start happening when you turn on a load.
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