Oil Pressure Issue?

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Old Mar 18, 2010 | 01:19 PM
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Default Oil Pressure Issue?

My oil pressure has been acting up a bit. The car starts up fine in the mornings with my guage reading at about 40psi. It'll read fine as I drive goes up when I accelerate. Then as I sit at idle the pressure will start to drop all the way down to about 20 which I think is dangerously low. Then I get back on it and the needle goes up. The car has never done this before. My dad and his friend seem to think its a sensor gone bad. Any ideas? I really would like to get the car checked out.
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Old Mar 18, 2010 | 02:21 PM
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First off all, that really isn't dangerously low. LSX engines tend to very high oil pressure, but 20psi really isn't that low.

I would agree that if it used to be higher and for no reason started reading low, you might want to look into it.

Is this a stock pump?
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Old Mar 18, 2010 | 02:54 PM
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That is a little strange. Really you only need 10lbs per 1000 rpm to be safe. Have you changed to a different weight of oil lately?
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Old Mar 18, 2010 | 03:09 PM
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Originally Posted by Juicy J
First off all, that really isn't dangerously low. LSX engines tend to very high oil pressure, but 20psi really isn't that low.

I would agree that if it used to be higher and for no reason started reading low, you might want to look into it.

Is this a stock pump?
yes it is a stock pump. I havent really done much to it since I bought it new back in 02.
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Old Mar 18, 2010 | 03:11 PM
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LS69TA, no I havent changed the oil weight. That's why its strange. At highway speeds it used to read anywhere from 55-60 now its just barely at the 40 marker.
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Old Mar 18, 2010 | 03:34 PM
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Originally Posted by SSnemesis
LS69TA, no I havent changed the oil weight. That's why its strange. At highway speeds it used to read anywhere from 55-60 now its just barely at the 40 marker.
You might want to try to add a real pressure gauge and then you can rule out whether the sending unit is the culprit or not.
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Old Mar 18, 2010 | 04:04 PM
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Originally Posted by LS69TA
You might want to try to add a real pressure gauge and then you can rule out whether the sending unit is the culprit or not.
I'll have to get it checked out. Anyone know any good shops around DFW?
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Old Mar 18, 2010 | 04:05 PM
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OMG im having the same issue brother. I MEAN THE SAME ISSUE.

Pressure was 55-60 on highway like you said and now if I am driving down the highway it is at 40 and when get on it the needle barley compensates until I tap my brakes THEN the needle moves a little past 40 to say. . 43. and when i came to a redlight i saw my pressure drop all the way down to 20. It scared the **** out of me.
I drove it home and haven't driven it since.

I'm pulling the intake manifold off now to check my "oil pressure sending unit" is cracked or not. Im gonna replace it . . cracked or no crack just to be on the safe side.
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Old Mar 19, 2010 | 09:49 AM
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Originally Posted by Sykokilla
OMG im having the same issue brother. I MEAN THE SAME ISSUE.

Pressure was 55-60 on highway like you said and now if I am driving down the highway it is at 40 and when get on it the needle barley compensates until I tap my brakes THEN the needle moves a little past 40 to say. . 43. and when i came to a redlight i saw my pressure drop all the way down to 20. It scared the **** out of me.
I drove it home and haven't driven it since.

I'm pulling the intake manifold off now to check my "oil pressure sending unit" is cracked or not. Im gonna replace it . . cracked or no crack just to be on the safe side.
Damn, so I'm not the only one with this problem, lol. Yeah I'm gonna pull mine off as well and do the same. I agree, better to play it safe. I'm also gonna replace the pressure sensor as well. Let me know what you find when you pull the intake to check the sending unit.
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Old Mar 19, 2010 | 12:30 PM
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Default oil pressure

Originally Posted by SSnemesis
Damn, so I'm not the only one with this problem, lol. Yeah I'm gonna pull mine off as well and do the same. I agree, better to play it safe. I'm also gonna replace the pressure sensor as well. Let me know what you find when you pull the intake to check the sending unit.
This is my story, I have a 98 z28, stock motor, on my last oil change, I used a Mobil one filter M1-206 and Pennzoil 10-30 regular dino oil. My old filter was a Fram, pressure always ran low, 40 cold and between 20 and 25 hot.

Now, cold pressure is around 60-70 and hot at 30-40.

Don't use a BS filter, been getting higher oil pressure since changing to a Mobil One filter. It worked for me.
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Old Mar 19, 2010 | 01:08 PM
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Originally Posted by 87 grand
This is my story, I have a 98 z28, stock motor, on my last oil change, I used a Mobil one filter M1-206 and Pennzoil 10-30 regular dino oil. My old filter was a Fram, pressure always ran low, 40 cold and between 20 and 25 hot.

Now, cold pressure is around 60-70 and hot at 30-40.

Don't use a BS filter, been getting higher oil pressure since changing to a Mobil One filter. It worked for me.
I use the BOSCH filter and MOBILE 1 oil. On cold start ups yes my pressure reads at about 60-70, but as I drive it starts to drop but never lower than 20, so far. The pressure does go up when I get on it but doesnt go over 40 even at highway speeds. It just has me uneasy since its never done this before.
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Old Mar 19, 2010 | 06:30 PM
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Well, my 6.0 i installed has me wondering, it is about 35 or so after it gets hot and i beat on it at idle, thought it should be higher. Never goes below 35 really, 30 at the lowest but shoots up with the RPM, as long as it doesnt make noise i guess it is ok.
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Old Mar 19, 2010 | 10:11 PM
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Originally Posted by SSnemesis
Damn, so I'm not the only one with this problem, lol. Yeah I'm gonna pull mine off as well and do the same. I agree, better to play it safe. I'm also gonna replace the pressure sensor as well. Let me know what you find when you pull the intake to check the sending unit.
im buttoning up my car now. I just replaced my pressure sensor with a new BWD from O'rielys. The old sensor showed no signs of damage. . but like we agreed on. . better p[lay safe. Also changed out my plugs and wires. bout to crank. . . will tell ya whats up when i get back from a drive.

Originally Posted by 87 grand
This is my story, I have a 98 z28, stock motor, on my last oil change, I used a Mobil one filter M1-206 and Pennzoil 10-30 regular dino oil. My old filter was a Fram, pressure always ran low, 40 cold and between 20 and 25 hot.

Now, cold pressure is around 60-70 and hot at 30-40.

Don't use a BS filter, been getting higher oil pressure since changing to a Mobil One filter. It worked for me.
Don't assume we are using crap filters. The OP is using Bosch and I myself am using a WIX filter. I understand what you are sayign about the cold vs hot weather though. but no matter the temp my pressure used to stay in the ranges. 50-60 highway 40 idle. now is 40 highway. 20 idle. at the snap of a finger. . no gradual change it was just sudden and i noticed it.
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Old Mar 19, 2010 | 10:19 PM
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Several variables, temps, viscosity, filters, senders, etc. As was stated earlier 10 psi per 1000 rpm = all good. On another note pressure is not nearly as important as volume
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Old Mar 19, 2010 | 11:23 PM
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I had the same problem, I had pieces of my cam stuck in my oil pump lol!
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Old Mar 19, 2010 | 11:55 PM
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hopefully I don't have that problem.

Well, I changed out the Oil pressure sending unit and nothing happened. Same ****.
So tomorrow im gonna go get my oil changed and im gonna get them to drop the pan and take a look at whats going on with it. If its somin major I will sell this damn thing and buy a shitty civic.
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Old Mar 20, 2010 | 01:32 AM
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How many miles are on the motor?
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Old Mar 20, 2010 | 12:04 PM
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Problem fixed.

I went and got my oil changed. Had them put new Mobil 1 5w 30 and Wix filter.
The pressure actually changes again with throttle and after a 2 hr drive has never seen 20 psi THANK GOD! highway 40-50psi idle 36psi WOT 58psi

I really hope you get everything going good OP. Good luck bro!
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Old Mar 20, 2010 | 12:08 PM
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I only use wix or AC delco.
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Old Mar 21, 2010 | 09:49 PM
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SAME exact issue with me guys, I run 10w30 amsoil racing oil with the ams oil filter, I'm going to be changing oil this week or next week along with the filter, I'm cammed so I'm expecting a little lower but yea..
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