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Why does my Jeep Cherokee have no oil pressure after a routine oil change?
Wiki User
∙ 16y ago
It takes a few seconds for the oil pump to fill the oil filter and then pressurize the engine's lubrication system.
If your Jeep has the earlier AMC based 4.0, 4.2, or 6.0 liter engines, the oil filter is rather large and takes a few seconds longer to fill. If you change your own oil, you can prefill the filter with oil if the filter mounts with the filter pointing upwards... horizontal mounting makes for a mess.
If you change the oil and the pressure registers within 6 or 7 seconds of start-up and idle, there is no damage to the engine. I have had an engine that was run for three or four 15 second runs without damage (I made an oops installing an oil pump and it wouldn't prime).
If you are concerned about oil pressure, have the engine checked with an external pressure gage. If the pressure is below specifications, the pump may be worn and is taking too long to build up pressure after an oil change. The AMC pumps give long service and usually only need replacement after very high milage.
Wiki User
∙ 16y ago
Wiki User
∙ 15y agoMy quess would be oil sending unit went bad or oil pump or bad gauge.
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