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Old 05-09-2011, 10:46 PM   #1
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Default You can read spark plugs. Anything else?

I've got an old oxygen sensor and an old front exhaust manifold. One can look at a spark plug to see its history. Does that hold true for any other parts?

History aside from, "this part definitely earned its pension," of course.
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Old 05-09-2011, 10:49 PM   #2
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Not much to read on a O2 sensor other then color. Black rich, white lean, gray good.
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Old 05-09-2011, 11:17 PM   #3
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Depends on the O2 as well, a front one black/sooty can be a clogged cat.
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Old 05-10-2011, 12:26 AM   #4
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First thread, black. Bulb, pink and white. Tip of the bulb, bluish-gray. Guess it saw a lot before retirement.

Kind of light indicates slight leanness... Makes sense, my fuel pump is getting tired (42 psi, 60K miles ago).
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