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Old October 31st, 2012, 11:17 AM   #1
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Default low oil pressue in my 94 tbi 350

ok so i just got a 94 silverado with the 350 tbi with unknown miles on it the guy said it was a junk yard motor, the truck has 195000 miles on her
so my problem is the motor runs fine but i have low oil pressue when its warmed up like at idle 5 pounds just above red and driving 55 around 10-15,... when its cold it will sit around 60 , it does have a small exaust manifold leak but i dont think that is a problem.....
do oil pumps go bad like that?
btw i changed the oil and no change...
any suggestion? thanks...
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Old October 31st, 2012, 11:50 AM   #2
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put in a manual gauge for a more accurate reading. go from there.just my .02
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Old October 31st, 2012, 11:56 AM   #3
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If a manual gauge reads the same. Do an easy fix buy a oil pump and slap it in. You can even get high volume for a few bucks extra. 31.99 for a high volume 19.99 for a normal one. Easy cheap fix
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Old October 31st, 2012, 11:59 AM   #4
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Rule of thumb is 10 psi for every 1000 rpm's in normal. It not, either the gauge is f*cked, the pump is worn, the dizzy drive gear is smoked or the engine in worn out.
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Old October 31st, 2012, 12:20 PM   #5
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ok ill check with a manual gauge, but i have a new problem im getting fuel in the oil i just checked the oil and im getting a milky color and it smells like gas.... could it just be worn out rings ?
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Old October 31st, 2012, 12:24 PM   #6
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Milky color in oil is usually anti-freeze, signs of head gasket, check your coolant. Sounds like motor is tired........
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Old October 31st, 2012, 01:39 PM   #7
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Intake manifold gasket or head gasket. I would plan on a rebuild.
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Old October 31st, 2012, 01:52 PM   #8
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Quote:
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Intake manifold gasket or head gasket. I would plan on a rebuild.
x2. Or a swap out with another motor would probley be cheaper route to go.
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Old October 31st, 2012, 05:20 PM   #9
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yea its antfreeze the motor still runs great doesnt overheat or anything so i think ill tear the heads off and go from there.... if it works out then ill keep the motor if not ill be on the market for a good used one.... thanks guys for the help
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Old November 1st, 2012, 11:45 AM   #10
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its not gonna overheat necessarily. check your overflow and radiator as well, if theres any mixing in there too. dont know why it would smell like gas though. i think your best bet is to replace the engine as a whole.
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Old November 2nd, 2012, 05:53 AM   #11
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i havent checked those but i think im gonna just start looking for a whole engine, its better in the long run and then ill know what i have cause right now im dealing with a mystery motor i keeps getting worse the farther i dig....
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Old November 2nd, 2012, 06:46 AM   #12
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things to look for on your old engine issues.
1. pancake batter colored engine oil. if you pop the valve cover and its packed full like it was sprayed in.
causes is anti freeze mixed in oil.
caused by intake gaskets or in you case those blocks had bad castings. they would leak coolant from the lifter valley walls right under the head bolts about 3" down. I have replaced hundreds of them.

2nd and more likely your issue. head bolts
the last bolt on the back of the right head have a bad tendencey of snapping or stretching. if it does so then it leaks coolant to the rear cylinder(right next to the dowel pin hole). and then it slowly takes on the same issues as the "pancake battered" oil. however. it will get the fuel smell going in the oil and the coolant will smell corrosive. its because its building up hydro-carbons in the radiator.
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Old November 2nd, 2012, 07:18 AM   #13
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Here is a motor
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Old November 3rd, 2012, 06:28 AM   #14
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Quote:
Originally Posted by Yetti View Post
things to look for on your old engine issues.
1. pancake batter colored engine oil. if you pop the valve cover and its packed full like it was sprayed in.
causes is anti freeze mixed in oil.
caused by intake gaskets or in you case those blocks had bad castings. they would leak coolant from the lifter valley walls right under the head bolts about 3" down. I have replaced hundreds of them.

2nd and more likely your issue. head bolts
the last bolt on the back of the right head have a bad tendencey of snapping or stretching. if it does so then it leaks coolant to the rear cylinder(right next to the dowel pin hole). and then it slowly takes on the same issues as the "pancake battered" oil. however. it will get the fuel smell going in the oil and the coolant will smell corrosive. its because its building up hydro-carbons in the radiator.
wow thats a lot of awesome info, im gonna pull my valve covers off tomorrow and take a good look... hopefully i can get to the bottom of this and get it fixed, the motor is tired out but if i can make it last and save me money that would be great lol, thanks that really helped me!!!!
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Old November 3rd, 2012, 06:31 AM   #15
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hmm ill think about that on the motor i got a couple that im looking at for around 400, ill keep it in mind, thanks for the lead
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