Go Back   Corvette Forum > C5 Corvettes, 1997 - 2004 > C5 Tech
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C5 Tech
Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace Sponsored by
Karl Chevrolet

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 05-09-2009, 07:03 PM   #1
greenc5
CF Senior Member
 
Member Since: Jul 2007
Location: Columbus Ga
Default low oil pressure at idle

Went for a drive today, about 90 degrees in Columbus. Noticed at an idle the oil pressure dropped to 14. oil temp and coolant temp both about 225. Oil level is full. 87,000 miles.

Had this problem last summer when it actually dropped as low as 12. changed to 10w30. Looks like that didn't help much.

Any suggestions would be greatly appreciated.
greenc5 is offline   Reply With Quote
Old 05-09-2009, 08:07 PM   #2
02Z06clark
CF Senior Member
 
02Z06clark's Avatar
 
Member Since: May 2009
Location: honesdale pa
Default

Oil pump possibly ?
02Z06clark is offline   Reply With Quote
Old 05-09-2009, 08:10 PM   #3
lucky131969
Tech Contributor
 
lucky131969's Avatar
 
Member Since: Jan 2007
Location: Hoffman Estates IL
Send a message via Yahoo to lucky131969
Default

Quote:
Originally Posted by 02Z06clark View Post
Oil pump possibly ?
lucky131969 is offline   Reply With Quote
Old 05-09-2009, 08:35 PM   #4
greenc5
CF Senior Member
 
Member Since: Jul 2007
Location: Columbus Ga
Default

That's what I'm afraid of, hoping someone would have some other ideas before I go there.
greenc5 is offline   Reply With Quote
Old 05-09-2009, 09:25 PM   #5
glkfam
CF Senior Member
 
Member Since: Jul 2005
Default Oil Pressures

First I think I would change back to 5w-30 synthetic. Then here is the pressures right out of the manual for a 1997. Possibly they may be different for different years. maybe someone could chime in for your year. I also just needed to install a new oil pressure sensor from Autozone, it was a Brass Borg-Warner one and noticed my pressure were slightly different then when the original GM sensor was in.

6.0 psig at 1000 RPM
18.0 psig at 2000 RPM
24.0 psig at 4000 RPM
glkfam is offline   Reply With Quote
Old 05-09-2009, 10:00 PM   #6
greenc5
CF Senior Member
 
Member Since: Jul 2007
Location: Columbus Ga
Default

It might just be normal, i get good pressure at higher rpm's. mine is a 2000 by the way. It's due for a change, so I probably will go back to the 5w30 (mobile one). Thanks for the response.
greenc5 is offline   Reply With Quote
Old 05-10-2009, 10:56 AM   #7
dgrant3830
Tech Contributor
Wounded Warrior Escort '11
Support Corvetteforum!
 
dgrant3830's Avatar
 
Member Since: Dec 2006
Location: Van Buren Arkansas
Send a message via AIM to dgrant3830 Send a message via Yahoo to dgrant3830
Default

Even with my super high-mileage '99, the oil pressure in hot temps and with the engine hot, only got down to 19 psi. As stated, minimum is 6 psi. The dealer or mechanic can do a mechanical oil pressure test to verify. Your's getting down to 11-12, I'd be concerned. You might want to pull and replace the oil filter and cutting open the removed filter to check for metal bits trapped within. If you find none, that would obviously be a good thing and good for the peace of mind.
dgrant3830 is offline   Reply With Quote
Old 05-10-2009, 11:20 PM   #8
greenc5
CF Senior Member
 
Member Since: Jul 2007
Location: Columbus Ga
Default

Appreciate the answers. Anyone have an idea of what it would cost to replace the oil pump?
greenc5 is offline   Reply With Quote
Old 05-10-2009, 11:56 PM   #9
ALLEGRO
CF Senior Member
 
ALLEGRO's Avatar
 
Member Since: Feb 2003
Location: Memphis Tennessee
Default

Which filter brand do you have on her? could be a restrictive filter.
ALLEGRO is offline   Reply With Quote
Old 05-14-2009, 03:38 PM   #10
greenc5
CF Senior Member
 
Member Since: Jul 2007
Location: Columbus Ga
Default

Sorry for not staying up with my own post. Can't tell you what brand the filter is, had it done at the local oil change place. It is Mobil One oil. The problem has occurred over a couple of oil changes. The first was done by a local guy who did some other work on the car. I am about due for another change. What filter would you suggest?
greenc5 is offline   Reply With Quote
Old 05-14-2009, 03:42 PM   #11
jrprich
CF Senior Member
 
jrprich's Avatar
 
Member Since: May 2006
Location: Hillsboro Oregon
Default

Couldn't it be a bad oil pressure sending unit?
These are known to fail on C5s. Usually they report higher than normal pressure, but perhaps your is doing the opposite.
jrprich is offline   Reply With Quote
Old 05-14-2009, 04:05 PM   #12
slothy
CF Senior Member
 
slothy's Avatar
 
Member Since: Feb 2008
Location: St. Clair Shores Mi
Send a message via AIM to slothy Send a message via Yahoo to slothy
Default

USING 10-30 IN MY CAR, so its not the oil

any ticking noises?

i would have a mechanic put a mechanical oil pressure tested on it and see if the sensor is reading bad or you have another issues like failing oil pump.
slothy is offline   Reply With Quote
Old 05-17-2009, 08:20 PM   #13
greenc5
CF Senior Member
 
Member Since: Jul 2007
Location: Columbus Ga
Default

Thanks again guys, already did the sending unit replacement. Getting good pressure with rpm, 30's - 40's at normal driving speed. About how much to have someone replace the oil pump? ballpark,,,,
greenc5 is offline   Reply With Quote
Old 05-17-2009, 08:34 PM   #14
Eric D
Tech Contributor
St. Jude Donor '09-'10-'11
Support Corvetteforum!
 
Eric D's Avatar
 
Member Since: May 2008
Location: Howell Michigan
Default

Quote:
Originally Posted by greenc5 View Post
Thanks again guys, already did the sending unit replacement. Getting good pressure with rpm, 30's - 40's at normal driving speed. About how much to have someone replace the oil pump? ballpark,,,,
Chances are a new oil pump would give about the same pressures. With 88K miles, hot weather your idle pressure sound fine as long as it comes up to a higher value off idle. One way to get higher oil pressure is to drop in a new LS2 or LS7! That would be my choice over just and oil pump!!
Eric D is offline   Reply With Quote
Old 05-21-2009, 10:25 PM   #15
greenc5
CF Senior Member
 
Member Since: Jul 2007
Location: Columbus Ga
Default

Eric D,,,

I like the way you talk, both the "sounds fine" and the LS2/LS7...... That's a long range plan for now.

Thanks
greenc5 is offline   Reply With Quote
Old 05-21-2009, 10:39 PM   #16
buoniconti81
CF Senior Member
 
buoniconti81's Avatar
 
Member Since: Mar 2007
Location: Bensalem PA
Send a message via AIM to buoniconti81
Default

Gm stated that there manual said that anything above 9psi and below 65 psi... Its a funny thing? I had the same problem, it was my oil filter clogged.....
buoniconti81 is offline   Reply With Quote
Old 05-21-2009, 10:41 PM   #17
buoniconti81
CF Senior Member
 
buoniconti81's Avatar
 
Member Since: Mar 2007
Location: Bensalem PA
Send a message via AIM to buoniconti81
Default

Good time to run some sea foam through the car, and change that oil/filter...
buoniconti81 is offline   Reply With Quote
Old 05-22-2009, 12:06 AM   #18
Eric D
Tech Contributor
St. Jude Donor '09-'10-'11
Support Corvetteforum!
 
Eric D's Avatar
 
Member Since: May 2008
Location: Howell Michigan
Default

Quote:
Originally Posted by buoniconti81 View Post
Gm stated that there manual said that anything above 9psi and below 65 psi... Its a funny thing? I had the same problem, it was my oil filter clogged.....
Clogged with what?
Eric D is offline   Reply With Quote
Old 05-22-2009, 06:39 AM   #19
rebelheart
CF Senior Member
 
rebelheart's Avatar
 
Member Since: May 2008
Location: Lacombe Louisiana
Default

That amount of oil pressure is normal and should be no problem at all.Electronic oil pressure gauges arent all that accurate.LOL, if you are planning on a replacement,quit worrying and drive her til she blows!
rebelheart is offline   Reply With Quote
Old 05-22-2009, 06:33 PM   #20
red2001z06
CF Senior Member
 
Member Since: Dec 2008
Location: wilmington delaware
Default

mine c5z is a 2001 and the normal was around 35psi at idle and it has
80k on it. Just did a cam and mellon oil pump now its more around 45-50 at idle. Sounds a little low for me but thats just my .02 cents.
red2001z06 is offline   Reply With Quote
Old 05-22-2009, 06:33 PM
 
Go Back   Corvette Forum > C5 Corvettes, 1997 - 2004 > C5 Tech
Reload this Page low oil pressure at idle
 
 
 
Reply

Tags
40, 5w30, c5, corvette, hot, idle, level, loss, low, ls, ls2, normal, oil, pressure, psi


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
What's wrong? Oil pressure gauge reads normal but dipstick dry? Adam_W C6 Z06 Discussion 23 05-28-2014 09:47 AM
Oil pressure and coolant temp Kcyellowz06 C6 Z06 Discussion 10 02-20-2013 08:25 PM
Oil Pressure apd6545 C3 General 4 08-01-2012 03:17 PM
Oil pressure @ hot idle? haljensen C6 Tech/Performance 25 03-18-2005 07:59 AM


All times are GMT -4. The time now is 12:28 PM.


Emails & Password Backup