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Old September 2nd, 2008, 08:39 PM   #1
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Default 1989 bronco loses oil pressure at idle

I bought an 89 bronco with the 4.9 today, started ran and drove good. I got about half way home and as soon as i got below 1,000 rpms the oil pressure would drop below low. I still has the oil change sticker on it from 99 and still hasn't hit the mile to need an oil change yet, so im about to do an oil change and hoping that fixes it. What other suggestion if that doesn't fix it.
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Old September 2nd, 2008, 09:19 PM   #2
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Did an oil change, pressure doesn't drop instantly now, but still drops down to nothing, like it points where the pointer points when the car is off.
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Old September 2nd, 2008, 09:21 PM   #3
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hows the oil pan seal?
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Old September 2nd, 2008, 09:37 PM   #4
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No leaks
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Old September 2nd, 2008, 09:55 PM   #5
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Another update, When it loses oil pressure and I turn it off for a second it keep oil pressure until I drive for a while. Is this because of crap in the motor possible?
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Old September 3rd, 2008, 06:37 AM   #6
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does it knock when you first start it?
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Old September 3rd, 2008, 08:24 AM   #7
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Originally Posted by 04 EDGE View Post
does it knock when you first start it?
Nope doesn't knock at start up.
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Old September 3rd, 2008, 09:25 AM   #8
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Clean off the connection of your oil sending unit. Its a one wire connection that attaches to the sending unit on the driver side, in front near the timing cover. That could be full of bad oil/parafin so its giving a bad reading inside or the connection could be corroded and needs to be cleaned. It is also possible that your oil pump needs to be rebuilt due to bad seals.
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