Go Back  CorvetteForum - Chevrolet Corvette Forum Discussion > C3 Corvettes, 1968 - 1982 > C3 Tech/Performance
Reload this Page >

Is it normal for my Oil Pressure to drop to zero at idle?

Notices
C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

Is it normal for my Oil Pressure to drop to zero at idle?

 
Old 01-14-2005, 01:13 PM
  #21  
Matt Gruber
CF Senior Member
 
Member Since: Oct 2000
Location: New Smyrna Beach, FL
Posts: 9,618
Thanks: 0
Thanked 6 Times in 5 Posts
Default

Tip:
i don't need a gauge to check for zero.
the lifters will all tick loudly if it really has 0.
this happened only once to me, my 67 broke the oil pump shaft.
Another 0 test is to simply pull off the gauge line. with 0, nothing will come out.
Matt Gruber is offline  
Old 02-04-2018, 06:18 PM
  #22  
Martin082514
Junior Member
 
Member Since: Feb 2018
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Default 1987 corvette rpm drops and oil pressure

Hello I have a 1987 Corvette just recently bought it when I turn the engine on and parked normal the rpm drop from 8,000 down to 5,000 and oil pressure drops from 30psi-40psi down to 25psi lowest so far that I've seen what could be all the reasons this happens and what I could do to fix this problem? Please help.
Martin082514 is offline  
Old 02-04-2018, 07:01 PM
  #23  
HeadsU.P.
CF Senior Member
 
HeadsU.P.'s Avatar
 
Member Since: Aug 2017
Location: Cool Northern Michigan
Posts: 1,924
Thanked 326 Times in 311 Posts
Default

You jumped on a thread thats 13 yrs old. Please start a new one.
HeadsU.P. is offline  
Old 02-04-2018, 07:19 PM
  #24  
Martin082514
Junior Member
 
Member Since: Feb 2018
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Originally Posted by HeadsU.P. View Post
You jumped on a thread thats 13 yrs old. Please start a new one.
How do I do that I am totally new to this forum site.
Martin082514 is offline  
Old 02-04-2018, 07:36 PM
  #25  
riverracer au
CF Senior Member
 
riverracer au's Avatar
 
Member Since: Oct 2010
Location: "ɹǝpunuʍop" Adelaide, Australia
Posts: 997
Thanked 40 Times in 34 Posts
Default

and a 1987 comes under the C4 section.....
riverracer au is offline  
Old 02-05-2018, 05:54 PM
  #26  
dmaxx3500
CF Senior Member
 
dmaxx3500's Avatar
 
Member Since: Jan 2008
Location: chicago
Posts: 24,123
Thanked 437 Times in 346 Posts
Default

Originally Posted by 68BLUEVETTE View Post


I havethe same problem, drops to ~10 - 15 psi at idle and up to 30 - 35 at speed.
10-15 is the low end of ok,[as per gm10psi,per 1000rpms] id like to see 25-30 at idle,,and 40-50 at speed
dmaxx3500 is online now  
Old 02-07-2018, 07:35 AM
  #27  
theandies
CF Senior Member
 
theandies's Avatar
 
Member Since: Jun 2001
Location: "The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants."
Posts: 17,467
Thanked 270 Times in 227 Posts
Default

Originally Posted by HeadsU.P. View Post
You jumped on a thread thats 13 yrs old. Please start a new one.
I don't know why people say this. There is a lot of good information in the old threads.
theandies is offline  
Old 02-07-2018, 07:47 AM
  #28  
iwasmenowhesgone
CF Senior Member
 
Member Since: May 2008
Posts: 2,834
Thanked 293 Times in 234 Posts
Default Agreed

Originally Posted by theandies View Post
I don't know why people say this. There is a lot of good information in the old threads.
Why do people have issues with old threads??? If it is technical information, as was in this case, maybe one of the posters with good information has moved on, and yet his input remains. You start a new thread on this subject, and all you have is input from current people.

If the thread is about, or questions some recent business, a new product, etc....I can see why it becomes old over time.

Lastly......why do people care that its an old thread? Don't look at the dates if it bothers you, but I like the information.

Last edited by iwasmenowhesgone; 02-07-2018 at 07:48 AM.
iwasmenowhesgone is offline  
Old 02-07-2018, 08:47 AM
  #29  
theandies
CF Senior Member
 
theandies's Avatar
 
Member Since: Jun 2001
Location: "The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants."
Posts: 17,467
Thanked 270 Times in 227 Posts
Default

I'm glad people are using the search function. Isn't that what it's for? Find answers to your questions?
theandies is offline  
Old 02-07-2018, 08:58 AM
  #30  
theandies
CF Senior Member
 
theandies's Avatar
 
Member Since: Jun 2001
Location: "The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants."
Posts: 17,467
Thanked 270 Times in 227 Posts
Default

As for low oil pressure. As posted on 1-13-2005 by Paul go get a cheap oil pressure gauge and make sure it not the gauge first. That's if you have a mechanical oil pressure. I guess there would be a way with an electric gauge but since I don't have one I don't know. I could probably rig something from the oil sensor to a cheap electrical gauge if I had to though.
theandies is offline  
Old 02-07-2018, 09:46 AM
  #31  
aswile
Junior Member
 
Member Since: Apr 2014
Location: Seaford Delaware
Posts: 46
Thanked 8 Times in 6 Posts
Default

The gauge on my Big Block C2 did the same thing and the gauge only had a few thousand miles on it from being rebuilt. When a reliable test gauge was used it showed plenty of oil pressure at idle when the factory gauge looked to show almost zero. As another poster said...check the easy stuff first.
aswile is offline  
Old 02-07-2018, 11:37 AM
  #32  
HeadsU.P.
CF Senior Member
 
HeadsU.P.'s Avatar
 
Member Since: Aug 2017
Location: Cool Northern Michigan
Posts: 1,924
Thanked 326 Times in 311 Posts
Default

Originally Posted by iwasmenowhesgone View Post
Why do people have issues with old threads??? If it is technical information, as was in this case, maybe one of the posters with good information has moved on, and yet his input remains. You start a new thread on this subject, and all you have is input from current people.

If the thread is about, or questions some recent business, a new product, etc....I can see why it becomes old over time.

Lastly......why do people care that its an old thread? Don't look at the dates if it bothers you, but I like the information.
Because its likely the car in question is long gone. Been sold to one, two or three other owners by now. You can't help fix that car from a thread 10, 12, 14 yrs ago. Car could have even been scrapped or sent to Europe, who knows? Start fresh with old issues / new threads!

Last edited by HeadsU.P.; 02-07-2018 at 11:38 AM.
HeadsU.P. is offline  
Old 02-07-2018, 11:46 AM
  #33  
AboveTheLogic
CF Senior Member
 
AboveTheLogic's Avatar
 
Member Since: Apr 2013
Location: Henderson NV
Posts: 1,144
Thanked 80 Times in 68 Posts
Default

If you're buying an oil pressure gauge to test, get a mechanical one with the hose that goes to the gauge. You can connect it to the port next to the distributor. I have one for this specific purpose as my oil pressure sending unit and speedhut gauge don't play nice together.
AboveTheLogic is offline  
Old 02-07-2018, 06:46 PM
  #34  
theandies
CF Senior Member
 
theandies's Avatar
 
Member Since: Jun 2001
Location: "The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants."
Posts: 17,467
Thanked 270 Times in 227 Posts
Default

Originally Posted by HeadsU.P. View Post
Because its likely the car in question is long gone. Been sold to one, two or three other owners by now. You can't help fix that car from a thread 10, 12, 14 yrs ago. Car could have even been scrapped or sent to Europe, who knows? Start fresh with old issues / new threads!
Your argument make no sense. So you're saying two different cars can't have the same symptom/problem? Just because the owner who asked the original question may or may not own that car or has fixed their problem doesn't mean the original question and suggestions won't help others. The original tech on our cars is not changing.

Do you use the original service manual? WHY? After all the latest one published was way back in 1982. That was 35 years ago. That is essentially what you're saying.
theandies is offline  
Old 02-07-2018, 07:30 PM
  #35  
HeadsU.P.
CF Senior Member
 
HeadsU.P.'s Avatar
 
Member Since: Aug 2017
Location: Cool Northern Michigan
Posts: 1,924
Thanked 326 Times in 311 Posts
Default

If you like old crap thats fine. I get frustrated when I start reading over the responses, dozens of responses, then realize its from 2003 ! ! ! Like I said, its better to start with a new thread, old topic.

Last edited by HeadsU.P.; 02-09-2018 at 11:52 AM.
HeadsU.P. is offline  
Old 02-07-2018, 07:38 PM
  #36  
bmans vette
CF Senior Member
Support Corvetteforum!
 
bmans vette's Avatar
 
Member Since: Nov 2006
Location: Athens GA
Posts: 18,575
Thanked 252 Times in 231 Posts
St. Jude Donor '12-'13, '15- '16-'17-'18-'19
Default



So its an old thread.
The new guy needed an answer and did not know how to start a thread.
Lets remember that all of us were new guys at one time.
Answer his question and politely advise him how to post a thread.
That way he will not run off thinking we all are a bunch of old grumpy farts.

Peace
Bman
bmans vette is offline  
Old 02-07-2018, 07:41 PM
  #37  
HeadsU.P.
CF Senior Member
 
HeadsU.P.'s Avatar
 
Member Since: Aug 2017
Location: Cool Northern Michigan
Posts: 1,924
Thanked 326 Times in 311 Posts
Default

But I am an old grumpy fart. And if you look at #23, I said please as I was pulling my pants up to my armpits. Now get off my lawn!

And sorry new guy.

Last edited by HeadsU.P.; 02-07-2018 at 08:03 PM.
HeadsU.P. is offline  
Old 02-07-2018, 07:55 PM
  #38  
calwldlife
CF Senior Member
 
calwldlife's Avatar
 
Member Since: Jan 2007
Location: Southern Cal Ca
Posts: 39,231
Thanked 76 Times in 75 Posts
Default

there was a rule about how long ago a thread was
inactive and posting in it.
anywho.
having researched a few things, finding thread after thread where the original poster never gave a fix to a problem is the worst thing.
calwldlife is offline  
The Following User Says Thank You to calwldlife For This Useful Post:
HeadsU.P. (02-07-2018)
Old 02-07-2018, 09:15 PM
  #39  
vette_jim
CF Senior Member
 
Member Since: Nov 2014
Location: Georgia
Posts: 154
Thanks: 0
Thanked 13 Times in 13 Posts
Default

Originally Posted by Matt Gruber View Post
i've found 20w50 is worth 11psi over 10w30.
29 went to 40 @65mph
Same here, switched to Valvoline VR1 20/50 Dino and had a great improvement on psi at idle. 10/30 synthetic was scary at idle here in the south on a hot July day...original engine with 68k.
vette_jim is offline  
Old 02-07-2018, 09:18 PM
  #40  
theandies
CF Senior Member
 
theandies's Avatar
 
Member Since: Jun 2001
Location: "The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants."
Posts: 17,467
Thanked 270 Times in 227 Posts
Default

Originally Posted by calwldlife View Post
there was a rule about how long ago a thread was
inactive and posting in it.
anywho.
having researched a few things, finding thread after thread where the original poster never gave a fix to a problem is the worst thing.


So why doesn't IB just delete old threads?

Now go out and throw away your ancient service manuals.

I do agree that the OP's need to post how they fixed their problem.

#Oldthreadsforever
theandies is offline  

Thread Tools
Search this Thread
Quick Reply: Is it normal for my Oil Pressure to drop to zero at idle?


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: