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2004 Envoy. 6 cylinder. Oil pressure is normal. But when at idle it drops to zero. Check gauges light illuminates. Been seeing a lot about the oil pressure switch. Any ideas?
 

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2004 gmc envoy_slt
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Some possibilities; bad oil pressure switch, low oil pressure or idle RPM too low. If idle is at or about 600 RPMs, try changing oil pressure switch. If idle is below 600 RPMs, clean throttle body.
 
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