LT1-LT4 Modifications 1993-97 Gen II Small Block V8

94 lt1 low oil pressure and tapping noise

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Old 06-09-2015, 08:30 PM
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Default 94 lt1 low oil pressure and tapping noise

Anybody know why when driving I loose oil pressure and have a valve tap noise?
Old 06-09-2015, 09:06 PM
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Does this happen while slowing down or on the brakes by any chance? If so, could be low on oil or your pick up tube fell off the pump.

Motor could be going out too but I'd start by double checking the oil level first. If oil level is ok then I would drain the oil pan then grab a small dead blow hammer and tap on the bottom of the pan and if you hear something bouncing around then its the pick up that fell off.
Old 06-09-2015, 09:13 PM
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[QUOTE=SQUEEGIOZ28;18838928]Does this happen while slowing down or on the brakes by any chance? If so, could be low on oil or your pick up tube fell off the pump.

Motor could be going out too but I'd start by double checking the oil level first. If oil level is ok then I would drain the oil pan then grab a small dead blow hammer and tap on the bottom of the pan and if you hear something bouncing around then its the pick up that fell off.[/QUOTE



It happens when I hit the gas oil pressure goes up and tapping noise gets louder then when I let off my pressure goes down and the tapping stops
Old 06-09-2015, 09:49 PM
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Oil pressure is going to fluctuate with RPM. Just because it goes down, does not mean you are "losing oil pressure". Maybe you should clarify the pressure readings. Tapping on acceleration might be an exhaust leak.
Old 06-10-2015, 06:51 AM
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If you put it in a higher gear and give it throttle, does it get louder? Like 5th gear at 30mph, give it alot of throttle, if it gets louder, thats an exhaust leak. If it stays the same, could be valvetrain.

Oil pressure should be 40ish running down the road, and rise with RPM near 60, and warm at idle can be as low as 5-10psi, thats normalish.
Old 06-10-2015, 09:40 AM
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It's auto and yes the harder I hit the gas the louder it gets to a certain extent



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