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Old September 3rd, 2008, 09:41 PM   #1
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Default 5 psi, too low?

I have an 89 bronco with a 4.9, was having problems with the gauge going down to nothing. I hooked up a mechanical gauge and warmed up and at idle it reads about ~5psi. I am running 10w-30, and suggestions on boosting it up other the running stupidly high weight oil?
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Old September 3rd, 2008, 11:15 PM   #2
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How many miles on the motor?

Break out the Plastigage, check the main bearings.
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Old September 3rd, 2008, 11:24 PM   #3
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general rule, 10psi for every 1k. So yes your bearings are most likely washed out. Throw in thicker oil to see if that helps... could also be a oil pump issue.
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Old September 4th, 2008, 11:57 AM   #4
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yes, thats too low
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Old September 4th, 2008, 03:23 PM   #5
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Change that 9 year old oil filter when you change the oil and you will be fine,
If you are not having any rattling at start up your bearings are good.
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Old September 4th, 2008, 04:31 PM   #6
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Already changed the oil and filter, and still does the same thing.
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