Thread: 1988 Oldsmobile 98 Error Code 64 PCM PROM Failure
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Old 08-02-2012, 10:27 AM
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Re: 1988 Oldsmobile 98 Error Code 64 PCM PROM Failure
64 is EGR valve flow code. Pull the EGR and inspect it and the port for carbon blockage, if its there, clean it out. The valve may need replacing also, even if you can't see a problem with it.
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