Oil Pressure
Thread Starter
Junior Member
Joined: Sep 2000
Posts: 22
Likes: 0
Oil Pressure
Hey everyone I have two questions in one. The first is why is it when I first drive my car the oil gauge is where it should be and when I accelerate the gauge rises like it should, but after driving for a while when i'm at idle it drops in the red? But then as soon as i accelerate it rises like it should. Second question is why when i start my car does it idle at 1500 rpm but as soon as i put it in gear it idles at 700, but if i throw it in park or in neutral it goes right back to 1500? Any help is greatly appreciated.
------------------
1992 RS
"Stock as a Rock" L03 future home of a TBI 350
------------------
1979 Firebird
Chevy 400, TH350, Holley Intake, Carter AFB Competition Series 4-barrel, One inch Mr. Gasket open plenum riser, custom cat back exhaust w/thrush muffler, Accel cap and coil, 14x3 Edelbrock Elite Series open element w/K&N filter.
------------------
1992 RS
"Stock as a Rock" L03 future home of a TBI 350
------------------
1979 Firebird
Chevy 400, TH350, Holley Intake, Carter AFB Competition Series 4-barrel, One inch Mr. Gasket open plenum riser, custom cat back exhaust w/thrush muffler, Accel cap and coil, 14x3 Edelbrock Elite Series open element w/K&N filter.
Senior Member
Joined: Aug 1999
Posts: 950
Likes: 0
From: This spot right here --->*
Car: 2002 SOM z28
Engine: LS1
Transmission: T-56
First question... The oil viscosity changes as the oil warms up. Imagine bacon greese in a pan. It liquifies and gets thinner when you warm it up.
The reason your idle drops is that the engine is under load when you drop it into gear. 1500 is a little high. Mine is around 1000 and 750 in drive.
------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...
-=ICON Motorsports=-
The reason your idle drops is that the engine is under load when you drop it into gear. 1500 is a little high. Mine is around 1000 and 750 in drive.
------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...
-=ICON Motorsports=-
Senior Member
Joined: Mar 2001
Posts: 547
Likes: 1
From: Pueblo Co usa
Your oil pump is just getting old.
According to the book your oil pressure at operating temp 180-? should be 40 at 2000rpm.
If you want to have some fun install a melling high volume pump and the oil pressure will be pegged
As for as idle that is controlled by the computer its sounds like its close so dont worry about it unless its jerking really bad when you put it in gear.
According to the book your oil pressure at operating temp 180-? should be 40 at 2000rpm.
If you want to have some fun install a melling high volume pump and the oil pressure will be pegged
As for as idle that is controlled by the computer its sounds like its close so dont worry about it unless its jerking really bad when you put it in gear.
Senior Member
Joined: Aug 1999
Posts: 950
Likes: 0
From: This spot right here --->*
Car: 2002 SOM z28
Engine: LS1
Transmission: T-56
Pressure is bad... volume is good. A good rule of thumb is 10psi for every 1000rpm. That actually can be a little lower on street cars.
------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...
-=ICON Motorsports=-
------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...
-=ICON Motorsports=-
Thread
Thread Starter
Forum
Replies
Last Post