[89lx5.0]

okay, here is the problem, i have a 89 LX 5.0 with a 5spd. recently the oil pressure gauge started to drop to nothing (stock gauge) when i come to a stop not immediatly but after sitting for a few seconds.... well sometimes immediatly. however when i am cruising along and push in the clutch and just let it coast it doesn't drop. also sometimes when at a stop it will drop down then jump right back up after a couple seconds.... also when i say drop i don't mean like slowly i mean like i just turned off the ignition kind of a drop, and i mean ALLLLL the way down, like when the car is off.....
PLEASE help me, and fast this is my only car right now.

[baine21225]

get a new gauge, it would be nicer anyway

[89lx5.0]

you think it's just my gauge? i hope your right. should i go mechanical or electric? if i go mech, it needs to be mounted outside the car right?

[Drick]

Mechanical does need to be mounted outside. Go electric. But I dont think its only your gauge but I dont know exactly what it is. Start with the gauge and go from there though.

[89lx5.0]

you think maybe the oil pump? ....please say no.....god i hope it's just a bad gauge

[1slo5.0]

I'd check it with a different gauge. If it still does it, then its time to worry.

[Twist it up]

hook a manuel gauge in the sending unit port and check it that way, my street car does that but it runs rich all the time..... not good on cylinder walls.....

[vfast]

Originally Posted by 8t6gt Mechanical does need to be mounted outside. Go electric. But I dont think its only your gauge but I dont know exactly what it is. Start with the gauge and go from there though.

mechanical gauge can be safely put in the cockpit..I use a copper line instead of the palstic one

[ymerej47]

Mine does the exact same thing
even tho ur engine is 2x bigger I dont think it matters
Mine has a mind of its own and Ive been driving it for a while what I did was
cleaned the engine bay to check for leaks...checked the dipstick regularly like everyday...
and then I checked for enlarged/dilated hoses and the ones I found I replaced with steel braided (2)
and my gauge still goes haywire so Im pretty sure urs is the gauge also

[Speedstang302]

Originally Posted by vfast Originally Posted by 8t6gt Mechanical does need to be mounted outside. Go electric. But I dont think its only your gauge but I dont know exactly what it is. Start with the gauge and go from there though. mechanical gauge can be safely put in the cockpit..I use a copper line instead of the palstic one

+1 copper line is ALOT safer

[Speedstang302]

i say if its the gauge...than electric and autometer ONLY!

[darkest hour]

Im just going to ask something stupid, but have you checked the oil level?

[NYHigH]

I'd bet on that it's the sending unit. My truck was doing the same thing. When i went around corners or came to a hard stop the guage would shoot back up. It was doing it for a while to, until i decided to do the easy thing first. Go to autozone and spend $30 at most for a new sending unit. Worked fine after that.