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ZERO oil pressure at start up!

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Old Jan 8, 2006 | 09:03 PM
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Default ZERO oil pressure at start up!

I've read several threads about the DIC and gauge indicating max oil pressure but I have the opposite problem. I start the engine and I have 0 oil pressure (on DIC & gauge) for about 5-7 seconds then it reads about normal. During the time of 0 pressure, the engine idles and sounds normal.
I've heard there have been problems with the pressure valve on the oil pump not opening (or closing?) and GM issued a TSB on the problem.
Any help would be appreciated .
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Old Jan 8, 2006 | 10:34 PM
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I'd definately put a mechanical gauge on it. I've heard issues with the by-pass valve in the Oil pump on later engines.
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Old Jan 8, 2006 | 10:44 PM
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Would the mechanical gauge go where the oil pressure sensor is located at the back of the intake manifold?
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