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1997 Chevrolet 5.7L oil pressure 75psi cold 65psi hot possible causes?

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  • james bierman Aug 28, 2010

    how did you measure oil pressure?
    guage on dash or
    mechanical guage?

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Sounds like your oil sender is off a bit not that much i wouldnt worry its normal to have close to 60 and 70 psi cold them at warmer eng temp it goes down 20 +psi as oil thins mine is about the same typical for gms

Posted on Aug 28, 2010

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2003 Chevy Venture Wont start once warm.


what kind of oil pressure does it have (hot and cold) ??? there is a oil pressure sensor that needs to see oil pressure in order to enable the ign circuit I do think they (gm) stopped using it in maybe 04 because it caused so many problems in cold climates but it maybe as early as mid year 03 cant remember that far back

Jul 26, 2016 | 2003 Chevrolet Venture Passanger

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Why is oil pressure high?


Engine oil pressure tends to be higher when everything is cold and should steadily fall to a normal value when hot which can be very low at idle but should reach the required pressure at about 2000/2500 rpm.

In theory the faster the engine turns the greater will be the oil pressure and this should be avoided as abnormally high oil pressure can harm the engine. In order to prevent this happening there is a spring loaded valve that will begin to open at a predetermined oil pressure and return surplus oil to the oil pan, therefore regulating the maximum pressure.

In cases where the oil pressure is higher than the usual hot reading but lower than the usual cold reading it could indicate the engine is being overcooled due to (possibly) a thermostat fault or similar.

If the pressure is abnormally high, higher than the usual cold reading, it indicates a fault such as a blocked oil filter, a partially blocked main oil gallery or a faulty pressure relief valve.
It is important such a fault should be investigated and corrected quickly without driving the car very far or fast and preferably not driving it at all because such a blockage, if it is a blockage, is likely to be causing oil starvation to an important part of the engine.

Aug 08, 2015 | Cars & Trucks

1 Answer

1997 chevy express van overheated now no oil pressure


sounds like possibly head gaskets, when you overheated probably warped heads causing coolant in oil and coolant in cylinders therefore partially hydrolocking...antifreeze does not compress like fuel vapors .check oil and see if looks like creme to light chocholate color. this means coolant in oil, this is very ******* bearings, eats them up and if thats the problem you loose oil pressure cause bearings are sloppy from being worn. Bottom Line.you might be looking for another enj.or rebuild

Jan 05, 2012 | 1997 Chevrolet Express

1 Answer

REplaced fuel pump still won,t start when its cold it starts right up when its hot the only way it starts when cold is relieve pressure from line 1997 chevey pu . 305 .


Check your fuel pump relay Alot of chevy systems back up the fuel pump power supply through the oil pressure sending unit . So even if the relay is NG the vehicle will still start and run because the oil pressure sending unit is feeding the pump . It also could be a combination of bolth a bad relay and the O P sending unit it needs to build up enough engine pressure to trip the switch inside the sender to send voltage to the fuel pump and it would do this much better if it was cold the oil is thicker

Feb 10, 2011 | Chevrolet 1500 Cars & Trucks

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How do I check and possibly replace the engine oil pressure sensor in a 2006 GMC Envoy Denali?


Oil Pressure Test Check for proper oil pressure at the sending unit passage with an externally mounted mechanical oil pressure gauge. A tachometer may also be needed, as some specifications may require running the engine at a specific RPM.
  1. While the engine is cold, locate and remove the oil pressure sending unit.
  2. Following the manufacturer's instructions, connect a mechanical oil pressure gauge and, if necessary, a tachometer to the engine.
  3. Start the engine and allow it to idle.
  4. Note and record the oil pressure reading when the engine is cold. The engine may need to run at a specified RPM, if so check the vehicle's specification.
  5. Run the engine until normal operating temperature is reached.
  6. Check the oil pressure reading again with the engine hot and record the value. Turn off the engine.
Compare the hot oil pressure reading to the specification. If the reading is low, check the cold pressure reading against the specification. If the cold pressure is well above the specification, and the hot reading was lower than the specification, the engine may have the wrong viscosity oil. Change the oil, making sure to use the proper grade and quantity, and then repeat the test.
Low oil pressure readings could be attributed to internal component wear, pump related problems, a low oil level, or oil viscosity that is too low. High oil pressure readings could be caused by an overfilled crankcase, too high of an oil viscosity or a faulty pressure relief valve.

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A/c not blowing cold air


80lbs on the low side is WAY too much if the clutch is running, the high side you should see 125-150ish, the low 30-40. I would feel the lines (the bigger line going into the firewall to see if it is cold when your pressure is right) if so suspect a blend door motor which controls the hot and cold switching inside.

Jul 24, 2010 | 1999 Chevrolet Venture

1 Answer

A/C will not blow cold. I tryed adding refridge


It will take it a while ,until the compressor starts staying engaged long enough to **** the freon in faster.

Jul 10, 2010 | 2003 Chevrolet Silverado 1500

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Not enough oil pressure while idling


Not really, when the oil is cold it is thicker so the pump is pushing the oil at a greater pressure.

When the oil gets hot, it is LESS thick than when it was cold, so naturally the pump does not have to work as hard to pump the hot oil and the pressure goes down.

You can go to the next thicker oil recomended by the manufacturer for your engine and you should see the oil pressure higher than before.

Mar 29, 2010 | 1992 Chevrolet Camaro

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I have recently purchased a 1997 Toyota


Unless you are in a cold part of the country, I'd suggest 10W40 or even 20W50 and see if the oil pressure improves. Mobil 1 will often yield lower oil pressure in higher mileage engines when hot. It's really not worth the money unless you live in near arctic conditions.

Dec 20, 2009 | 1994 Toyota Land Cruiser

1 Answer

No power when accelerating hard


Possibly a plugged catylitic converter. This can cause to much back pressure and that will cause the engine to run poorly under acceleration or loaded conditions.

Nov 09, 2009 | 1997 Chevrolet Suburban

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