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Offline camaromaniak

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oil presure
« on: June 22, 2010, 05:22:48 pm »
my car started to act different the other day. when it warms up after driving it around the oil presure drops to what i think is around 20 psi. never been this low. plus it has what sounds like a lifter tick coming from pass bank. has anyone ever had this issue. have not driven car since it started . think i read some where about some o ring on pick up tube that does something  strange and can cause ... i think it said number 7 lifter to act weird.
« Last Edit: June 23, 2010, 08:06:13 pm by camaromaniak »
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kevin thompson 1999
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Offline thebrainhart

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Re: oil presure
« Reply #1 on: June 23, 2010, 08:57:30 pm »
I don't really know about the LS1, or oil pressure related things to it...

But usually, if you have good oil pressure when the oil is cold, and as it warms up it drops, then you have a decent sized internal engine problem. Could be leaking past the bearings, could be the oil pump, etc. When this happens, the oil doesn't make it up to the valvetrain, causing the ticking.

You checked the oil level and condition, I assume...
Does the pressue go up with RPM?
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Offline slomofo

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Re: oil presure
« Reply #2 on: June 23, 2010, 10:23:31 pm »
My Suburban did this, I changed the oil pump to a Melling high volume pump and oil pressure went back up to 70psi cold and 50psi warm. The problem ended up being my cam bearings in the end.
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Offline The Sad

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Re: oil presure
« Reply #3 on: June 24, 2010, 01:08:45 pm »
I think pre 2000 LS1's are rumored to have poor oil pumps (stop working).  Maybe this is a symptom?
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Offline camaromaniak

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Re: oil presure
« Reply #4 on: June 24, 2010, 04:48:55 pm »
oil is full and  about 500 mile away from being due for change. oil presure is normal when cold only drops to about 20 psi when warm and at idel . builds back to normal when you drive. the gauge acts as if it is sticky. i was going to change oil and i thought about adding a quart of 20/50 with the rest being 10/30. i have also heard ls1 have vaulve train noise .
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kevin thompson 1999
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Re: oil presure
« Reply #5 on: June 25, 2010, 07:25:15 am »
20 psi showing on the gauge at idle when fully warmed up seems normal to me, especially in the hot summer.  When you are reving / driving, it should peak up to ~50 or so.

What did it used to do?
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Offline camaromaniak

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Re: oil presure
« Reply #6 on: June 25, 2010, 04:22:49 pm »
it always use to stay around 30 on a hot day. this weekend going to change oil and see if anything changes. it could be something as stupid as a sticky gauge or a sending unit on the fritz. i am starting to think if it was real bad all the vaulve train would be making noise not just from lifter. i know the problem is my 18 year old son has been driving it and ..... well lets just say he has a lead foot. found out a while ago he raced a super charged  roush mustang  and to my suprize only lost by a quarter of a fender.
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Offline camaro girl

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Re: oil presure
« Reply #7 on: June 26, 2010, 09:43:47 am »
I'm gonna go with oil pump, rear main seal or bearings. Ya know all that difficult stuff to change in the bottom of the engine.
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Offline The Sad

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Re: oil presure
« Reply #8 on: June 26, 2010, 10:32:38 pm »
Fortunately if it is the pump, on the LS1 it is on the front of the crank and can be changed relatively easily.... like when you put a cam in at the same time :)
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Offline GeoffWhite

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Re: oil presure
« Reply #9 on: June 27, 2010, 01:56:40 pm »
I've heard of this happening to cars with spun rod bearings. The rod bearing will spin and cause the oil pressure to drop and produce a ticking noise. I hope that isn't the problem!
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Offline camaromaniak

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Re: oil presure
« Reply #10 on: June 27, 2010, 07:10:40 pm »
it only make the ticking noise when it gets warm when its cold no noise. i would think it would have the sound all the time if it was a bearing. changed oil today no metal in it at all.now oil pressure when hot is around 25 to 30 and builds to 45 to 50. the car has never lost oil pressue all together car runs strong and pulls hard. its hard to tell could be a stupid exhaust leak. i should have some one who knows more about ls1 than i . look at it and listen to it.
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kevin thompson 1999
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Offline camaromaniak

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Re: oil presure
« Reply #11 on: June 27, 2010, 07:11:35 pm »
Quote from: The Sad on June 26, 2010, 10:32:38 pm
Fortunately if it is the pump, on the LS1 it is on the front of the crank and can be changed relatively easily.... like when you put a cam in at the same time :)
  i would love to do that
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kevin thompson 1999
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Offline thebrainhart

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Re: oil presure
« Reply #12 on: June 28, 2010, 12:34:59 am »
The reason for the difference with temperatures, is its viscocity. When the oil is cold, it is thicker. As it warms up, it gets thinner.
Since the bearings have such tight tolerances, when the oil is thick, it doesn't leak too much past the bearings, even when worn a bit.
As the oil gets hot, it can fit in smaller spaces, and can leak past the bearings, causing you to lose oil pressure from that point on.

Usually exhaust leaks are the opposite, its loud when cold, then usually gets quieter when the exhaust manifolds get hot.

 :-\
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Offline camaro girl

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Re: oil presure
« Reply #13 on: June 28, 2010, 11:47:03 am »
F body mechanic at Spencer Auto. :)
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Offline zeetwentyeight

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Re: oil presure
« Reply #14 on: June 29, 2010, 11:31:10 am »
What oil are you running in it?
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Offline camaromaniak

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Re: oil presure
« Reply #15 on: June 29, 2010, 09:24:29 pm »
it had nothing but valvoline 10/30 and only ac delco filters
« Last Edit: June 29, 2010, 09:24:56 pm by camaromaniak »
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kevin thompson 1999
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Offline Chevycrew

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Re: oil presure
« Reply #16 on: June 29, 2010, 09:35:43 pm »
I also just developed the tick... (99 ss)

Mine is drivers side valve cover, random when the car is hot.  If it cools down a little, next time it starts it wont do it.  I notice when the tick occurs Im at about 25psi at 2000 rpms, when no tick, Im about 35psi at 2k.

I drive it daily and it has only done it twice in the last 2 weeks.

Ill be doing an oil pump shortly for safety sake.
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