Need you'r thoughts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RIDDLA · 02-15-2010, 04:41 PM

I bought a 89 gmc Suburban 5,7 700r4 4x4. The problem is my oil pressure it seems low it moves to 15 then will drop to 0 step on the gas and it picks up pressure to 30.Is this normalfor the trucks? I changed the oil filter and oil to 10w30 chevron with ac delco filter. while down there i noticed it has a oil cooler is this factory or did the po install

muddyblazer02 · 02-25-2010, 10:52 PM

check the oil pressure sender and the connection if it is good then see if you really have oil pressure. put a mechanical gage on it. you may be able to get a loaner from the parts store. if you have oil pressure then try changing the sender. if not start looking thinking oil pump or you have worn bearing on the main bearings.
ken

Driveway Dreams · 02-26-2010, 01:29 AM

Is it possible that you are not putting enough oil in it? With the oil cooler, it will need more oil than normal.

muddyblazer02 · 02-26-2010, 10:40 PM

Quote:

Originally Posted by Driveway Dreams

Is it possible that you are not putting enough oil in it? With the oil cooler, it will need more oil than normal.

if it is showing full on the dipstick then its full cooler or no cooler because the cooler would hold oil in it. we know it has oil in it because the truck is running. however if the cooler has a leak then that could affect oil pressure.
ken

Driveway Dreams · 02-27-2010, 01:49 AM

Of course it is full if the dipstick shows full, but this has not been stated yet. Also, it could still be running well even if a little low on oil. I am only trying to point out something that may not have been thought of, to help diagnose the issue.

low88burb · 02-27-2010, 07:05 PM

does it have alot of miles on it ? when the crank and rod and main bearings have alot of wear your oil pressure will drop and pick up with rpm .

RIDDLA · 02-28-2010, 12:50 AM

I did find a leak it has 128000 miles

Tony_SS · 02-28-2010, 05:16 PM

Start with changing the sender.. see if that helps.

02-15-2010, 04:41 PM	#1
RIDDLA Registered User Join Date: Aug 2002 Location: Santa Fe NM Posts: 393	Need you'r thoughts I bought a 89 gmc Suburban 5,7 700r4 4x4. The problem is my oil pressure it seems low it moves to 15 then will drop to 0 step on the gas and it picks up pressure to 30.Is this normalfor the trucks? I changed the oil filter and oil to 10w30 chevron with ac delco filter. while down there i noticed it has a oil cooler is this factory or did the po install __________________ 68 GMC-Stripshow 70 Chevy Monte Carlo 72 Chevy Monte Carlo LOLO 72 Chevy Suburban Blurban 74 Vw Bug 78 Chevy k10 lwb 78 Chevy k10 swb 03 Cadillac Escalade-Duecesix 84 Cadillac Coupe Deville DeElegance B.O. A Lifestyle Money Cant Buy! Win,Lose, or Tie I'm a Raider till i die

02-25-2010, 10:52 PM	#2
muddyblazer02 Registered User Join Date: Sep 2007 Location: Austin, Tx Posts: 50	Re: Need you'r thoughts check the oil pressure sender and the connection if it is good then see if you really have oil pressure. put a mechanical gage on it. you may be able to get a loaner from the parts store. if you have oil pressure then try changing the sender. if not start looking thinking oil pump or you have worn bearing on the main bearings. ken __________________ truck junkie

02-26-2010, 01:29 AM	#3
Driveway Dreams I have car A.D.D. Join Date: Feb 2009 Location: Greeley, Northern Colorado Posts: 4,147	Re: Need you'r thoughts Is it possible that you are not putting enough oil in it? With the oil cooler, it will need more oil than normal. __________________ -Gerald Building vehicles in memory of the first "car guy" I ever knew, my Grandpa. Bob Dunham 1935-2009. Rest in peace. 61 GMC Suburban SOLD The 86 build thread SOLD Are you a Colorado member?Click here.

02-27-2010, 01:49 AM	#5
Driveway Dreams I have car A.D.D. Join Date: Feb 2009 Location: Greeley, Northern Colorado Posts: 4,147	Re: Need you'r thoughts Of course it is full if the dipstick shows full, but this has not been stated yet. Also, it could still be running well even if a little low on oil. I am only trying to point out something that may not have been thought of, to help diagnose the issue. __________________ -Gerald Building vehicles in memory of the first "car guy" I ever knew, my Grandpa. Bob Dunham 1935-2009. Rest in peace. 61 GMC Suburban SOLD The 86 build thread SOLD Are you a Colorado member?Click here.

02-27-2010, 07:05 PM	#6
low88burb Registered User Join Date: Feb 2010 Location: sidney iowa Posts: 62	Re: Need you'r thoughts does it have alot of miles on it ? when the crank and rod and main bearings have alot of wear your oil pressure will drop and pick up with rpm .

02-28-2010, 12:50 AM	#7
RIDDLA Registered User Join Date: Aug 2002 Location: Santa Fe NM Posts: 393	Re: Need you'r thoughts I did find a leak it has 128000 miles __________________ 68 GMC-Stripshow 70 Chevy Monte Carlo 72 Chevy Monte Carlo LOLO 72 Chevy Suburban Blurban 74 Vw Bug 78 Chevy k10 lwb 78 Chevy k10 swb 03 Cadillac Escalade-Duecesix 84 Cadillac Coupe Deville DeElegance B.O. A Lifestyle Money Cant Buy! Win,Lose, or Tie I'm a Raider till i die

02-28-2010, 05:16 PM	#8
Tony_SS Registered User Join Date: Dec 2008 Location: Washington, MO Posts: 643	Re: Need you'r thoughts Start with changing the sender.. see if that helps.



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