Question about 1989 Chevrolet S-10 Blazer

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Why does my oil gage move up and down at idel from 0 to 80???

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Oil pressure sensor/sending unit is malfunctioning

Posted on Sep 23, 2009

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Have the oil pressure checked with a test gage, if it is ok then replace the oil pressure sending unit. I assume the oil level is good.

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Oil pressure gage


At idle, at operating temp is there any ticking from top end of engine? Are there any knocking noises brom bottom end?
If no noises, change oil and add some Marvel oil to clean out galleys. If that dosent work, change oil pressure sendingf unit. Also, if you have a mechanical oil pressure gauge, hook it up and take a direct reading. Oil pressure (in any vehicle) at idle should NEVER be less than 15psi. Generally in 4.0 jeep engines it's never less than 30, with a high reading at driving rpm of about 40-60! (but, you did not mention what engine you have)

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