Low oil pressure after warm
Staging Lane
Joined: Aug 2003
Posts: 59
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From: Belle Vernon, PA
Originally Posted by WMSuperSport
Mikez28, mine does the same, how long have you been driving around like that?
I plan to replace the sending unit, and if that doesn't help I'll replace the pump and o-ring, and if that doesn't help-it looks like a rebuild. Anyone know of any job openings in DFW?
I plan to replace the sending unit, and if that doesn't help I'll replace the pump and o-ring, and if that doesn't help-it looks like a rebuild. Anyone know of any job openings in DFW?
Let me know how changing that stuff goes.
Teching In
Joined: Dec 2003
Posts: 36
Likes: 0
From: Spotsylvania, Va
What is 'normal' psi for these engines? I had my engine rebuilt over the summer and I never paid attention to what the oil pressure was before and after. With Mobil 1 5W-30, it was 25-30 psi at idle and would drop to about 20 psi when I would let the clutch out and no more than 45 psi at WOT 6k RPM. I just changed it to Mobil 1 10W-30 this weekend and it is higher, around 45 psi on cold startup, around 35 psi at warm idle.
Can anybody recommend a good place for oil analysis? I'd like to do that in a few thousand miles just to check for a spun bearing or anything.
Can anybody recommend a good place for oil analysis? I'd like to do that in a few thousand miles just to check for a spun bearing or anything.
Thread Starter
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From: Ft. Worth, TX
Originally Posted by Z28GSXRTim
What is 'normal' psi for these engines?
Can anybody recommend a good place for oil analysis? I'd like to do that in a few thousand miles just to check for a spun bearing or anything.
Can anybody recommend a good place for oil analysis? I'd like to do that in a few thousand miles just to check for a spun bearing or anything.
TECH Resident
Joined: Nov 2002
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Originally Posted by WMSuperSport
After the car warms up I get very little oil pressure. It seems to be getting worse over the past year or so. Has anyone else had this problem and fixed it? Thanks,
Wes
Wes
Originally Posted by Z28GSXRTim
Just another thought- I am using a Fram oil filter. What is everybody else using, especially the guys with the low pressure? What is recommended?
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Joined: Dec 2003
Posts: 36
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From: Spotsylvania, Va
Hmmmm, interesting. I've heard that before, but thought nothing of it. Well, I will change the filter for an AC Delco or something and see what happens then. Hopefully that will cure my problem.
as long as you have 10ps1 / 1000rpm you will be fine
mine sits just below 40 at idle...and goes up to almost 80 when I am up at 6500rpm...
and I have noticed it sits a little higher or lower depending on filter....right now I have on a fram..
mine sits just below 40 at idle...and goes up to almost 80 when I am up at 6500rpm...
and I have noticed it sits a little higher or lower depending on filter....right now I have on a fram..
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
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Some obvisou things to check 
- check your oil level. Make sure your arent running really low
- change your oil and run an AC delco filter. Check the plug for shavings
If that does nothing look at an oil pump replacement.
did this happen right away or over time after the swap?
- check your oil level. Make sure your arent running really low
- change your oil and run an AC delco filter. Check the plug for shavings
If that does nothing look at an oil pump replacement.
did this happen right away or over time after the swap?
Originally Posted by Z28GSXRTim
Hmmmm, interesting. I've heard that before, but thought nothing of it. Well, I will change the filter for an AC Delco or something and see what happens then. Hopefully that will cure my problem.
Thread Starter
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From: Ft. Worth, TX
Chris, my level is fine and it seems to be the same no matter what filter I use. My pressure has progressively gotten worse over the past year or so (I'm guessing I only put about 5K on my car the past year) and I've used Fram, AC Delco, and now a WIX. Once warm I get almost 10 psi at idle and near 40 at WOT.
Has anyone ever heard of an oil pump to start loosing pressure like this? I thought they just quit working all together...
Might switch from 10W-30 to 15W-50 or something like that.
Thanks
Has anyone ever heard of an oil pump to start loosing pressure like this? I thought they just quit working all together...
Might switch from 10W-30 to 15W-50 or something like that.
Thanks
Staging Lane
Joined: May 2003
Posts: 73
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From: Greece
Quick question. I am showing these same indications but my question is are you running hot. I removed my radiator cap and cranked the car and noticed that the water did not move. Believe I might have to replace my water pump and thermostat and believe that is what is causing my low oil pressure after it gets hot. What do yall think???
Originally Posted by Z28GSXRTim
That's just it- I am only seeing a max of 45 psi at WOT @ 6k RPM.
soundengineer- what mods do you have done to your car?
soundengineer- what mods do you have done to your car?
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Thread Starter
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From: Ft. Worth, TX
Originally Posted by rspect
Quick question. I am showing these same indications but my question is are you running hot. I removed my radiator cap and cranked the car and noticed that the water did not move. Believe I might have to replace my water pump and thermostat and believe that is what is causing my low oil pressure after it gets hot. What do yall think???
Teching In
Joined: Jan 2002
Posts: 22
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From: Ttxas City, Texas
I was reading old threads
Did you ever figure out your problem?
If so what was it.
Thanks.
Did you ever figure out your problem?
If so what was it.
Thanks.
Originally Posted by WMSuperSport
On startup oil pressure is about halfway up the guage, then once warm (a few minutes later) it will drop closer to the red than 25psi. I would guess around 10 psi or so at idle. At WOT is doesn't even reach 25 psi.
Thanks for the help,
Wes
Thanks for the help,
Wes
Thread Starter
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From: Ft. Worth, TX
Nope, never figured it out. I just replaced my stock oil pump and now I get alot higher pressure, but it still goes down after the engine warms up. I'm building a whole new engine now.