Question about 1999 Chevrolet Silverado 1500

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Have a 1999 Z71 chev truck with 5.3 L engine that has fluctuating oil pressure. Started with low oil pressure after start with engine clak that disappeared after it warmed up. Changed oil and found sludge in crankcase. cleaned as best we could and blew back through oil filter housing. Now engine shows ''0'' oil pressure after start for about 10 seconds then goes to mid range on gauge. After it warms up, oil pressure starts to drop and engine appears to labour intermittitently.

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In some cases where the oil is not changed properly, the oil pump screen maybe plugging or your oil filter is defective. Fram is a good filter. If there is no problem found, replace the pressure sensor.

Posted on Jul 27, 2009

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Oil pressure insufficient. please what can i do please help me


You checked that you have oil in the engine, right? If not, check it before starting the engine again.

If you are not low on oil, it could be the oil pump that's gone bad, clogged oil filter, or even the oil pressure sensor. Have a mechanic check it.

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Most engines have a low pressure shut-off OR the lifters no longer work with lack of oil.
Have someone check the REAL oil pressure with a gauge.They can thread a gauge into the Oil pressure sensor hole.
Since the oil pressure sender COULD be bad,you need this true reading.
It should run just long enough to give a reading,I hope.
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Oil guage fluctuates at low rpm-2002 chev. silverado. Repair program says unit is on oil pan. Chevy says its on top of motor behind intake manifold.


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The oil pressure switch relays the oil pressure in the engine to the instrument cluster. The switch will illuminate the OIL PRESSURE light if the oil pressure drops below 2psi (13 pa). The switch is usually located on the side of the engine, under the intake manifold on the 2.2L engine and on the side of the intake camshaft housing on the 2.3L/2.4L engine.


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Fig. 1: The oil pressure switch is located on the engine block under the intake manifold and is accessible from underneath the vehicle-2.2L engine

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Fig. 2: Oil pressure switch location-2.3L/2.4L engine


Other, the low oil level switch activates the OIL light in the instrument cluster when the oil level in the pan goes below a certain level. The switch is mounted on the oil pan.


Hope this helped (remember rated this post).

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Oil sending unit is probably going bad.Just be sure that your oil is full.

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This is probably a faulty fuel pressure regulator. You can rent a tool at most auto part stores that connects to the fuel rail to show you the pressure level. If it is low (less than @40 PSI) or if it fluctuates very much, replace the regulator. It is also a good idea to replace the fuel filter, as it can clog and prevent adequate fuel supply from reaching the engine. You may want to replace the filter first, as it is usually cheaper.

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ur oil pump may be failin-there r sensors everywhere on new cars-keepin u from starting as safety measure-computer systems r complex n things dont always show on 1 scan-they kinda hav the mindset of a pc

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Hi! The problem you are outlining is very similar to the Rover V8 (Buick engine). We Brit's are used to the low oil pressure when warm. I presume a complete oil change engine flushed with new replacement filter has been carried out? Maybe a top quality synthetic oil with additive may help. You may take it a little further and replace the oil pump with an after market performance up rated one. If you really are worried about low oil pressure damage whilst in low rev's try Molybnenum Disulphide an oil additive which really reduces friction metal to metal wear particulary in the situation you are describing.
That's the best I can suggest at this moment.
Good Luck! and Happy New Year!
Paul 'W'
Onyer~EDson(:0)~[><

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