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O2 light comes on about 4k rpms



On my '84 Scirocco, my oxygen sensor light will come on if the engine is reved for more than a second or two above 4k rpms. I've also noticed, especially at night, that the cluster lights will dim at the same time the light comes on and the oil temp guage will drop about 15 degrees. Once I upshift though and get the revs below 4k, everthing goes back to normal. I'm suspecting the alternator. Maybe the commutator is chewed up and the brushes are skipping?...any ideas?

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                   Kris Rayner
                1984 VW Scirocco
    1981 VW Scirocco S - Soon to be a 16V :)-
     "I do nothing in moderation but work."
               -Charles Dickens
        http://www.fix.net/~trzracing/web/

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