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Weird 99 LS1 Oil issue!

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Old 03-05-2012, 02:09 PM
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Default Weird 99 LS1 Oil issue!

Had the oil changed.

Took the car out for a cruise Saturday night never went over 2.5k RPMs.
Oil pressure starts to drop to 20 PSI at idle and fluctuate between 20-30 PSI. Next thing you know the guage bottoms out and check gauge light comes on.

I shut her down really quick.
Check under car no oil no smoke not even a smell of oil.

Let her sit start her up and the valve train is clicking as in not being lubed. The oil pressure stays at 45 PSI and eventually lube the valvetrain again and the clicking stops and the engine sounds quiet.

I park the car and leave her alone for the weekend.

Went out just now started her up and she runs just fine at 45 PSI at idle quiet as a mouse drive her around and oil fluctuates between 40-50PSI under 1.5 RPMs.

What the hell is up with this car?

Could it be the oil pump ready to croak? How could something mechanical give intermittent issues?

The guy who did the oil change not put enough or maybe too light of oil in her?

A crappy filter not installed correctly?
Old 03-05-2012, 03:09 PM
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Could be linked to the oil change. That's what i'd check first. And stop paying people to change your oil....that way you know its done right.
Old 03-05-2012, 03:18 PM
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Originally Posted by 01ssreda4
Could be linked to the oil change. That's what i'd check first. And stop paying people to change your oil....that way you know its done right.
Your right man!

Also upon further inspection of the engine bay I noticed this line is ripped and disconnected.
Could this be the culprit?



Last edited by kevamg; 03-05-2012 at 03:27 PM.
Old 03-05-2012, 04:03 PM
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Originally Posted by kevamg
Your right man!

Also upon further inspection of the engine bay I noticed this line is ripped and disconnected.
Could this be the culprit?
Thats your PCV hose,it wouldn't cause that problem.

Your OPSU is bad or your pump is on the way out.
Old 03-05-2012, 04:11 PM
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I believe that you are now possibly victim of a sticking oil pump bypass valve. It is probably time for a new oil pump. Call Katech.

Just my $.02
Old 03-05-2012, 06:15 PM
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Will do guys
Old 07-16-2013, 11:04 AM
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Did you end up finding the problem? I am dealing with the same type of issue on my 99 ls1 trans am.

Here is my post:
https://ls1tech.com/forums/generatio...-problems.html
Old 07-16-2013, 11:48 PM
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That vacuum line disintegrating is very common on these cars.
Old 07-17-2013, 06:28 AM
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Do the oil again your self and see what happens after that. You never know when someone else is under the hood.



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