What would cause low oil pressure on a 1999 Dodge Dakota,125K miles. Oil pump and pressure regulator replaced? Pressure is erradic, as it reads 60 psi for awhile then drops to zero.Sending unit replaced but continues to have the same problem. What gives???
Have you had a mechanical gage put on it? Perhaps there is an intermittent electrical problem between the sender and the gage (perhaps a corroded and/or loose connector terminal) or in the gage itself. The mechanical gage would bypass such possible problems and confirm whether the pressure itself is truly fluctuating or if it is erroneous gage readings. If you aren't getting any indication from the engine that the pressure is truly dropping to zero (valvetrain clatter, etc.), you might just assume an electrical cabling or gage problem and troubleshoot it accordingly.
Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x')
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