as rpms rise oil pressure falls.

gt40_2003wes

I did sound a wee bit gay there.

Aug 14, 2005

461

2

48

ky

Mar 30, 2008

#1

• Mar 30, 2008

• #1

need a lil help with this guys. first of all i kno the stock guage is just there for a indicator not really accurate.

so when i get in my car start it up on idle it has good oil pressure but the higher the rpms, the lower the oil pressure. i just don't get what is up with this. only been happening the last 3 days.

checked my oil it was fine maybe oil pump? just wondering if anyone has had the same issue and what they did to resolve it.

 

Mr. Rustypwnz

Advanced Member

Jun 1, 2005

1,761

63

69

indianapolis/ valdosta ga

Mar 30, 2008

#2

• Mar 30, 2008

• #2

well if you are having second guesses about the gauge, go get a sunpro gauge or something for cheap that is mechanical, and that should tell ya right there...

 

mustangfan1990

New Member

Jul 17, 2005

505

1

0

Lenoir, North Carolina

Mar 30, 2008

#3

• Mar 30, 2008

• #3

yeah if it still does it I would think that the oil pump driveshaft is turning inside the pump....could be the driveshaft is rounding off or the oil pump hole is

 

gt40_2003wes

I did sound a wee bit gay there.

Aug 14, 2005

461

2

48

ky

Mar 30, 2008

#4

• Mar 30, 2008

• #4

so maybe oil pump? im gettin ready to do a tranny swap anyways so miaswell go ahead and do the oil pump while im at it.

 

BlownFiveLiter

have car, will race....wait, it doesn't run

15 Year Member

Nov 29, 1999

3,133

18

108

Chicagoland

Mar 30, 2008

#5

• Mar 30, 2008

• #5

Get a real gauge on there ASAP. If your pressure is really dropping as RPM increases, start looking into a new shortblock sooner, rather than later. Chances are you have some excessive bearing clearances, or even worse, a crack somewhere in the main webbing and you're bleeding off oil pressure, if it's dropping with RPM. I wouldn't bet on it being the oil pump, unless you went from having pressure, to having none. Maybe a blocked pickup tube, but you'd have to pull the pan to find out either way.

 

gt40_2003wes

I did sound a wee bit gay there.

Aug 14, 2005

461

2

48

ky

Mar 31, 2008

#6

• Mar 31, 2008

• #6

alright messed around with it some more. it holds great oil pressure until about 1800 rpms then starts falling off between 2grand and 4grand, then it picks back up at 4grand and builds all the way to the limiter.

dunno whats up with this chit. ill definately get a better guage and see whats up.

 

SuperStang83

Founding Member

Mar 21, 2001

1,693

0

49

Boyertown, Pa

Mar 31, 2008

#7

• Mar 31, 2008

• #7

Yeah, your best bet is to get a good gauge so you can accurately diagnose the problem.

 

ls1beater4eva

New Member

May 13, 2005

334

0

0

mooresville

Mar 31, 2008

#8

• Mar 31, 2008

• #8

i had that problem go get a good guage , one of my cars just had a bad guage the other one i wasnt so lucky it had a 2 cracked mains

 

88stangmangt

Active Member

Nov 25, 2003

2,332

1

48

Stafford,VA

Mar 31, 2008

#9

• Mar 31, 2008

• #9

if the mechanical guage still readys funny change your oil/OF and re-check..