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2005 Chevy Silverado 5.3 72000 miles.

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Old Jun 8, 2023 | 12:26 PM
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Lespaul1978's Avatar
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Default 2005 Chevy Silverado 5.3 72000 miles.

Has. New oil pump , New oil pump seal , New oil sending unit, screen removed,
Still has low oil pressure, Lifters tap at different times,
Does not use oil or leak.
Please Gelp Me Someone.
Thanks.
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Old Jun 8, 2023 | 12:29 PM
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Have you verified the pressure with a mechanical gauge or are you relying on the dash?

The rockers could be tapping due to a lack of oil flow to the top end but not necessarily low pressure.

Verify the oil pressure with a mechanical gauge to determine the next steps of diagnosis.
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Old Jun 8, 2023 | 12:48 PM
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Tell us what your pressures are cold vs hot, idle vs highway
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Old Jun 8, 2023 | 1:02 PM
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When it all started , it would would take longer then normal for the pressure to come up to 30l lbs , and it was make a vibration on start up , now it's not doing that but it holds 30 at idle and 36 at 2000 rpm, and it has at one or more lifters taping after you drive it a little .
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Old Jun 8, 2023 | 7:37 PM
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Originally Posted by Lespaul1978
When it all started , it would would take longer then normal for the pressure to come up to 30l lbs , and it was make a vibration on start up , now it's not doing that but it holds 30 at idle and 36 at 2000 rpm, and it has at one or more lifters taping after you drive it a little .
The rule of thumb for oil pressure is 10 PSI per 1,000 RPM. If the pressures you’re seeing are accurate - which cannot be verified except with a mechanical gauge - there’s nothing wrong with the oil pressure being produced by the pump.

That said, the sensor port location will only tell you the oil pressure post-filter, but it doesn’t tell you how much oil/oil pressure is reaching the lifters. The sensor port tees off the oil galleys that feed the lifters, cam and crank.

It’s possible there’s a restriction in the top end causing oil starvation. The easiest way to verify is to remove the valve covers and crank the engine over without starting it for +/- 30 seconds. By then, oil should be jetting from every rocker.
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