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15y ago

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What would cause a Chevy 350 engine to have oil pressure when cold and lose oil pressure when at running temp?

When the engine is cold, all the parts are tight. Meaning, the bearings, rods, and all have less gap. The oil is also thick. As the engine warms, the oil also warms making it lighter or more fluid. If the main bearings have too much gap, then with the warmer oil the oil flow will increase which in turn will lower the oil pressure. It would not be abnormal to start out with 50 or 60 lbs then have it reduced to 20 lbs at idle. Although the pressure would increase to around the 50 lbs. mark as the engine rev's up. If the oil pressure goes down to say 10 lbs, even at high rev's, then have the pressure checked with a mechanical gauge to confirm the reading and if so, well, time for a rebuild. Low oil pressure will not reach the outer parts of the engine and will eventually cause a lot of damage.


What would cause a 1989 s10 blazer to die after it warms up?

check your catalytic converter to see if its plugged as this will cause the engine to die. good luk,ozzy


Why would a 1994 Dodge van 250 3.9L sometimes have good oil pressure and go low after engine warms?

Bad oil pressure sending unit? Try replacing with a mechanical gauge Excessive engine wear? Do a compression test


What would cause the engine oil pressure gauge to rise?

When the oil pressure guage is in the high position, it means you have good oil pressure. As your car warms up, the pressure should drop a little. The guage will usually drop at stop signs and stop lights and then go up as you accelerate. If your guage goes to high and stays there, you could have a problem with your sending unit or you could have too much oil in the car.


Which one of the following situations would cause air pressure to rise an increase in temperature cold air entering the region moisture entering the air?

An increase in temperature would cause air pressure to rise. As air warms, its molecules gain more kinetic energy and spread further apart, leading to an increase in pressure. Cold air entering a region or moisture entering the air would not directly cause air pressure to rise.


2001 Jeep Grand Cherokee after your engine warms up the oil pressure will drop when idle the engine does not make a knocking noise what would cause this?

drop your oil pan and clean or change the oil pump screen and it should work...I had to do that and cleaned it with parts cleaner and now it works fine..they tend to clog after awhile.


Why it is not advisable to overfill the engine with oil?

If it is high enough to be splashed by the crankshaft it would foam up. That would cause a lack of oil pressure and engine damage.


Would crank sensor cause car to stall when it warms up?

youtube!


What would cause the speedometer in a BMW 325 to not work until the engine warms up?

the speedometer switch is located at the rear of the diferential, remove wires clean and refit, that should cure it.


What would cause 1998 jeep wrangler to idle high after it warms up fuel pressure regulator i have replaced idle sensor?

Unmetered air sneaking in to the intake. Look for vacuum leaks.


Why does oil pressure drop and check engine light flicker after engine warms up on 1991 Ford Van E350 with 351 engine?

HELLO , I THINK POSSIBLY THE OIL PUMP IS GOING BAD, SO I WOULD REPLACE PLACE IT AND WITH A NEW STRAINER AND GASKET. EVEN REPLACE THE OIL PRESSURE SWITCH OR SENDING UNIT ITS THE SAME THING!!!!!!


What would cause the oil pressure on a 96 jeep Cherokee to go from 45-60 then slowly climb up to 80 psi and then come back down again when you let off the gas?

The oil pressure is created by the oil pump which is mechanicly driven inside the engine. When oil is cold it is thicker so oil pressure is higher, as it warms it thins and lowers the pressure slightly. When you rev the engine up the oil pump pumps faster, therefore raising the pressure in accordance with the rpm. Those readings sound fine to me. Hope this helps

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