Jeep Oil Pressure is '0' at idle.

[jackflack44]

I drove 150 miles in my '97 TJ 2.5L 4cyl yesterday, and i shut it off to go grab something from the house, got back in fired it up all was good until i pulled up to a stop sign and my oil pressure dropped down to 0 and the check gauges light came on. It was fine on the 150 mile trip here. as i pulled away from the stop sign my oil pressure came back up to 40 where it has always been. Does anyone have any ideas what the problem may be?

 

[yo momma yj]

sounds like a dirty oil pressure bypass sticking open.

for the most part, anything serious mechanical wouldn't correct like that.

there's a BS bypass in the oil filter, so it might just be an oil change...tho likely you have sludgey innerds... do lots of oil changes like you have a new religion.

there's also a bypass on the oil pump itself... which is a little trickier involving greasy rags and soap.

it might also be a BS dirty sensor connection gremlin...a manual pressure gauge will tell you the truth.

 

[SteelHeadz]

With the absence of engine knock when the gauge drops to zero, i would suspect that the oil pressure sending unit is faulty. As mentioned prior, use a manual oil pressure gauge attached to the same port as the sending unit and monitor the condition.

 

[Dirt Toy]

Those oil pressure are not very accurate\

1. Make sure that you do not need any oil
2. the weight of the oil you use can make a difference

I have a 2000 toyota tundra with a 3.4 liter and at stop signs/lights the oil pressure drop to zero, but no alarms go off.

Next oil change put in a 10w40 oil and the oil pressure should stay up idling.

Good Luck

Dirt Toy

 

[Dirt Toy]

another problem I had on jeep the senting unit on the passenger side toward the rear of oil filter. you could have a bad connection, I had trouble when the connection got wet. all kinds of bells and whistles goes off.

 

[jackflack44]

I'm gonna try lots of oil changes and then if that doesn't work I'll try the manual oil pressure gauge. Thanks for all the help I just got back from a trip to Minnesota so thats the reason for the lack of response. However I'm also going out of town tomorrow, until Monday, so I will post the results then. Thanks for the help!