low oil pressure
89 w 250 cummins has low oil pressure. new sending unit no help. what should i check next? oil light comes on at low idle goes out if you speed engine up a little.
thanks chan. |
Hook up a mechanical gauge to the engine and verify the reading. More than likely it is time for some engine work. The low oil light is a pressure switch, so it can't give a false reading.
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My gauge read low too.... but with a mechanical gauge I got 50psi.
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Originally Posted by u2slow
(Post 1028621)
My gauge read low too.... but with a mechanical gauge I got 50psi.
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replaced oil pressure switch low oil pressure light comes on at low idle with engine hot. it may be the oil pressure regulator stuck open. i will check that next. thanks for the info. i will post how that works out.
thanks |
I screwed a 2" liquid-filled mech. gauge on a 1/8" NPT nipple into the top of the top of the filter adapter. I check the real oil pressure whenever I want. (er, at least when the truck is stationary lol).
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Originally Posted by u2slow
(Post 1029308)
I screwed a 2" liquid-filled mech. gauge on a 1/8" NPT nipple into the top of the top of the filter adapter. I check the real oil pressure whenever I want. (er, at least when the truck is stationary lol).
thanks chan |
thanks for the info,new guy here . Doing body and paint on 1993 really like the old truck it was in fairly good shape when i go it . first guy ordered it from factory.
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Like cougar said, it could be a resistance problem. Does the low oil pressure light come on at an idle when cold and hot? If so it is an electrical issue, beyond the pressure sensor. According to your mech gauges the actual oil pressure is correct. The high resistance in the connectors and wires is giving the PCM a false reading.
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Ironically, my truck started this, but it doesn't have the low oil pressure light/buzzer. Can you agree that it's the gauge or wires again? It will drop to the rest, and come back, and drop randomly no rpm shake or movement related. Where would you hook up a mechanical oil press gauge and what is the tech manual specification for low idle and high idle oil pressure?
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