Lifetime Premium Member
Date registered: Jul 2011
Vehicle: 1993 300CE Cabriolet (mine) ; 1994 E320 Wagon (wife's) ; 1990 Benz 300E 2.6 (spare)
Location: S'Cruzin Around on the Left Coast
Mentioned: 10 Post(s)
Quoted: 986 Post(s)
if the wire to the oil pressure sender is BROKEN and disconnected, it reads always pegged at 3. my wife's E320 wagon came that way, and I drove it quite gingerly for a couple weeks til I got under there and fixed that stretch of crumbling corroded wire, and phew, her oil pressure is fine as was the sender... maybe 1.5 on a hot day with a fully warmed up engine at idle, and immediately goes to 3 with any RPMs at all....
the 1 pin plug on the sender was pretty easy to diassemble and solder a new stretch of automotive oil-resistant wire to, which I spliced onto the existing harness where the original wire wasn't disintegrated. this sender is on the back left corner of the engine, directly below the oil filter.
if the wire is shorted to ground, it will always read 0, btw.
the lower harness probably should be replaced but everything else seems fine, so cross-my-fingers-and... I know I know...
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