Oil presure
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New User
Joined: Jan 2007
Posts: 21
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Oil presure
I have a 1990 bronco and it runs and drives fine, when I start it in the morning the oil pressure right were it should be. but after it warms up the oil pressure goes up and down, someone told me it was the oil pump, but I think if the oil pump was bad the pressure would go up and down when you frist start it as well.
any other ideas? or any help would be great
Thanks
any other ideas? or any help would be great
Thanks
New User
Joined: Sep 2006
Posts: 21
Likes: 0
Do you have an aftermarket gauge? They are much more accurate than the stock gauges, and they will show alot more pressure fluxations. Normally, a cold engine will have higher oil pressure until it warms up, and then the pressure will rise and fall with the speed of the engine.
Elder User
Joined: Jul 2004
Posts: 757
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From: Fredericton NB, Canada
Cold oil will give a higher pressure reading. As it warms up, it will lose pressure. Completely normal. How's about posting what PSI you are running at in idle, and through a few different RPM's? The we should be able to tell you if the oil pump is working well or not.
Elder User
Joined: Jan 2005
Posts: 656
Likes: 1
From: Houston
It the gauge is going up and down with out you changing the RPM's then I would say your guage is shot. If your really concerned do what Kemicalburns suggested.
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Senior User
Joined: Dec 2005
Posts: 216
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From: boondocks, tennessee
yeah the stock gauge definatly sucks. mine did the same thing and stupid me jumped the gun and put in a brand new high volume pump. not a horrible decision to be sure the pump wasn't bad but i'm now leaking around the oil pan gasket. but i suppose that if its not one thing its another
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Senior User
Joined: Nov 2004
Posts: 162
Likes: 0
From: Benton, La.
I had a truck of another brand (starts with G ends with C) and the stock guage would go up and down all the time. I carried (actually drove it) it back up to the dealer where I bought it and was told this was normal. I insisted they fix it. They installed another guage and it still did the same thing.
My dad still drives that truck, when the trans isnt out, and it still does that. But we've never had an oil issue other than that... Odd.
My dad still drives that truck, when the trans isnt out, and it still does that. But we've never had an oil issue other than that... Odd.
Junior User
Joined: Feb 2003
Posts: 71
Likes: 0
From: Hampton Roads, VA
I hate to throw in some bad news, on my 302, (the motor I just pulled) had the same problem. At driving speeds, oil pressure was normal, at idle, check engine would come on and off as pressure fell and rose. I put on a mechanical gage, did the same thing...it was the cam bearings. I hope it is just the gage...the mechanical will tell you the story.