Question about 1992 Lexus Ls 400

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OIL LIGHT GOES OUT AT 1000RPM OTHER WISE ITS ON 1 CHANGED OIL TWICE 2 RPL OIL SENDING UNIT 3 PERFORMED MOTOR FLUSH

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I think you should have an accurate mechanical oil pressure test gauge installed in place of the oil sending unit and check to see what the actual oil pressure is. If it's 15 psi or so at an idle and about 35 psi or higher at 2500 rpm then your pressure is good and means you have some sort of issue between the sending unit and gauge. If the pressure is low, say below 10 or 5 psi at an idle with a warm engine and doesn't improve much at higher speeds then you actually do have low oil pressure, most likely due to worn bearings inside the engine. An accurate test gauge should tell the tale and help you figure out what is wrong. Hope this helps out a bit!

Posted on Jul 14, 2010

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My oil light comes on when driving and goes out when idling. Could it be oil sending unit and where is it


It is most likely the sending unit, most new ones are electric, so you will need to look near back of motor for a sensor that looks like a spark plug with 1-2 wires plugged into top. On older chev they are beside distributor at back of motor. this will show you what to look for look up the one for your vehicle. http://www.summitracing.com/int/search/product-line/standard-motor-oil-pressure-gauge-sending-units

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I got a 90 VW jetta 1.8l (german made), its got 232000 milse on it. What happened to day is I was doing an oil change to it. And I put in Gunks motor flush, and with in 1-2mins it died. It started back up,...


I would drain that and the oil out, and change the filter. The motor flush may have thinned out the oil. The lifers my have lost oil pressure due to the oil viscosity being thin from the motor flush.

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Idling speed


It is a well Known problem within the 2.7 L family ...
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once under the vehicle look to behind oil pan about center ways and take pigtail (wire) off sensor then remove unit .
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