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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Oil Pressure?

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Old Feb 3, 2016 | 09:06 PM
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Oil Pressure?

Hey guys, I have a 1989 Ford F-150 XLT Lariat with the 5.8 351 Windsor Fuel-Injected engine it. I was driving it today around the city and on the highway for a good hour. The oil pressure gauge was right at the beginning of the "Normal" section, but gradually as the more I drove went right below the "Normal" section. I was just wanting to know, or if you guys knew if this is something I should worry about, or is it normal? Should I replace the oil pressure sender/switch, or do you think the oil pump is going. It only has 169,980 miles on it. Please let me know guys! Thanks!
 
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Old Feb 3, 2016 | 09:13 PM
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I would install an aftermarket gauge,from what I understand the stock oil pressure gauges on the dash are just dummy lights,like as long as you have like 6 pounds of pressure they'll read normal.
 
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Old Feb 3, 2016 | 09:16 PM
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Alright sounds good thanks bud!
 
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Old Feb 3, 2016 | 09:41 PM
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Do you know what would cause the truck to idle around 1,500-1,800 RPM's in park at times then fluctuate between 1000-800 RPM's and at other times idle normal? Could this be the fuel pressure regulator? If it helps any, sometimes I try to start and it acts like it has a weak battery. If you wait 15 minutes it will start right up, or you can hook a pair of jumper cables to it and it will fire right up? I don't understand it and what is causing it.
 
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Old Feb 4, 2016 | 07:10 AM
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Check codes and see if you get any,could be a dirty idle air control valve.
 
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Old Feb 4, 2016 | 02:02 PM
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So I have a 96 with a 351. My oil pressure gauge always reads right in the middle of the gauge right at the r in normal. You said that as long as the gauge reads 6 pounds it says normal right? So an aftermarket pressure gauge would fix this?
 
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Old Feb 4, 2016 | 02:19 PM
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That's what I've have heard about them. An aftermarket gauge will tell you the real oil pressure instead of just normal.It won't change the one on your cluster.
 
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Old Feb 4, 2016 | 03:53 PM
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Thanks much. I'll check on it.
 
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