1997 2500 with 5.7 Oil Pressure Issue

Not Twice · 09-24-2008, 08:35 AM

1997 2500 with 5.7 150,000 miles. After motor is warm my oil pressure is dropping to 10 psi or less at idle with truck in gear and my Check Engine Light comes on. If I shift to neutral the RPM goes up about 150 more RPM’s and the oil pressure goes to about 10 psi and the light goes out. When running the oil pressure is pretty solid at 40 to 45 psi.

I have put a mechanical oil pressure gauge on to verify the accuracy of the electronic gauge and it validated that the low pressure is real. The mechanical gauge would sweep up and down as expected and showed 40 to 45 psi as well.

Any thoughts to what it may be? Oil pump screen clogged? Needs new pump? Engine is tired? Can I remove the oil pan and change the pump without lifting the engine or removing steering components?

87c10slammer · 09-24-2008, 08:56 AM

you may be able to do it by lifting it a little bit but i dont think you can unless you do. i would run some seafoam through it and see if it just has a clogged passage. but to me it sounds like your pump is on the fritz. i would change it before it turns real bad

stumpuller454 · 09-24-2008, 09:41 AM

I`ll check my service manual when i get home tonight and get gmS SPECS

cburcham73 · 09-24-2008, 11:29 AM

to be sure,, i would put a mechanical gauge on it before you replace the pump. ive seen those idiot gauges malfunction,or get out of calibration. i hate to see you go throught an oil pump if you dont need it.

cburcham73 · 09-24-2008, 11:48 AM

oh sorry .. i forgot you did put a mechanical gauge on it.. its been a long day....its most likely the pump.

leolkfrm · 09-24-2008, 02:55 PM

hopefully its just a pressure relief stuck on the pump and not a cam bearing sgtarting to turn.

09-24-2008, 08:35 AM	#1
Not Twice Junior Member Join Date: Sep 2008 Posts: 2	1997 2500 with 5.7 Oil Pressure Issue 1997 2500 with 5.7 150,000 miles. After motor is warm my oil pressure is dropping to 10 psi or less at idle with truck in gear and my Check Engine Light comes on. If I shift to neutral the RPM goes up about 150 more RPM’s and the oil pressure goes to about 10 psi and the light goes out. When running the oil pressure is pretty solid at 40 to 45 psi. I have put a mechanical oil pressure gauge on to verify the accuracy of the electronic gauge and it validated that the low pressure is real. The mechanical gauge would sweep up and down as expected and showed 40 to 45 psi as well. Any thoughts to what it may be? Oil pump screen clogged? Needs new pump? Engine is tired? Can I remove the oil pan and change the pump without lifting the engine or removing steering components?

09-24-2008, 09:41 AM	#3
stumpuller454 Senior Member Join Date: Dec 2007 Location: Grande Prairie, AB Posts: 2,206	I`ll check my service manual when i get home tonight and get gmS SPECS __________________ SUPERCHARGED 454 K2500 GMC! Watch My Youtube Videos!!<<<

09-24-2008, 02:55 PM	#6
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,932	hopefully its just a pressure relief stuck on the pump and not a cam bearing sgtarting to turn. __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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09-24-2008, 08:56 AM	#2
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	you may be able to do it by lifting it a little bit but i dont think you can unless you do. i would run some seafoam through it and see if it just has a clogged passage. but to me it sounds like your pump is on the fritz. i would change it before it turns real bad

09-24-2008, 11:29 AM	#4
cburcham73 Senior Member Join Date: Aug 2008 Location: williamsburg virginia Posts: 200	to be sure,, i would put a mechanical gauge on it before you replace the pump. ive seen those idiot gauges malfunction,or get out of calibration. i hate to see you go throught an oil pump if you dont need it.

09-24-2008, 11:48 AM	#5
cburcham73 Senior Member Join Date: Aug 2008 Location: williamsburg virginia Posts: 200	oh sorry .. i forgot you did put a mechanical gauge on it.. its been a long day....its most likely the pump.