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08 Silverado Low Oil Pressure?


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#1 hubob

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Posted 10 October 2009 - 07:51 PM

I just replaced the oil pump in my 08 Silverado 5.3L and I still have low oil pressure according to my dash gauge. It doesnt sound like it has low oil pressure. When its cold its fine but once it heats up at every stop or get below 1000rpm the low oil pressure indicator comes on. An suggestions?

#2 redvett

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Posted 11 October 2009 - 02:01 PM

I am puzzled why you messing with your truck unless you have over 100K on it, its under warranty let GM fix it.

I just replaced the oil pump in my 08 Silverado 5.3L and I still have low oil pressure according to my dash gauge. It doesnt sound like it has low oil pressure. When its cold its fine but once it heats up at every stop or get below 1000rpm the low oil pressure indicator comes on. An suggestions?



#3 desrtrat

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Posted 11 October 2009 - 02:39 PM

:lol:
also check for bad sending unit. put a mechanical gauge and see what that reads..

good luck

#4 Nytemare

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Posted 12 October 2009 - 07:51 PM

what kind of oil do you use.

Sometimes cheep oil doesn't make good oil pressure.
Posted Image

so you expected something that weights 5000 pounds and has aerodynamics of a piano to get what?


2003 Silverado XCSB, 4.8L, Flowmaster super44 SI/DO, G80 3.42, MSD Wires, K&N drop-in filter, Yellow Top Battery, Royal Purple in entire Drivetrain, W4M tune....My DD..............................SOLD
2010 Silverado XCSB 5.3L Z71 Summit White, Diablo Trinity tuned....more to come soon.
2010 Cobalt 2.2L LT 2Dr. Victory Red....gas saver/wife's Car.......SOLD
2011 Cruze 1.4L Turbo 1LT Crystal Red ...Again, Wifes car and gas saver
1978 LJ80, 16V 1600cc on 31's, Spring over lift, awaiting Full Frame off build...The Toy

#5 stlavsa

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Posted 12 October 2009 - 07:56 PM

what kind of oil do you use.

Sometimes cheep oil doesn't make good oil pressure.



Cheap oil wouldnt have anything to do with it.. IF the oil was too thin it could do it, butttttttttt it already calls for 5w30 which is pretty thin, and its an 08 I wouldnt assume the bearings are worn much yet.. so I would guess the problem is something else.

Like posted previously, why isnt it at the GM dealer?
Fabtech n 20's

#6 Nytemare

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Posted 12 October 2009 - 08:06 PM

what kind of oil do you use.

Sometimes cheep oil doesn't make good oil pressure.



Cheap oil wouldnt have anything to do with it.. IF the oil was too thin it could do it, butttttttttt it already calls for 5w30 which is pretty thin, and its an 08 I wouldnt assume the bearings are worn much yet.. so I would guess the problem is something else.

Like posted previously, why isnt it at the GM dealer?

Cheep oil could have a lot to do with it...I have seen this quite a few times. I had a few customers come in complaining about the oil light on..we changed the oil out that they bought for 97 cents a liter at Walmart and the pressure issue stopped. Some oils are not API certified.

But yes I agree...bring it in for warranty.
Posted Image

so you expected something that weights 5000 pounds and has aerodynamics of a piano to get what?


2003 Silverado XCSB, 4.8L, Flowmaster super44 SI/DO, G80 3.42, MSD Wires, K&N drop-in filter, Yellow Top Battery, Royal Purple in entire Drivetrain, W4M tune....My DD..............................SOLD
2010 Silverado XCSB 5.3L Z71 Summit White, Diablo Trinity tuned....more to come soon.
2010 Cobalt 2.2L LT 2Dr. Victory Red....gas saver/wife's Car.......SOLD
2011 Cruze 1.4L Turbo 1LT Crystal Red ...Again, Wifes car and gas saver
1978 LJ80, 16V 1600cc on 31's, Spring over lift, awaiting Full Frame off build...The Toy

#7 hubob

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Posted 12 October 2009 - 09:14 PM

what kind of oil do you use.

Sometimes cheep oil doesn't make good oil pressure.



Cheap oil wouldnt have anything to do with it.. IF the oil was too thin it could do it, butttttttttt it already calls for 5w30 which is pretty thin, and its an 08 I wouldnt assume the bearings are worn much yet.. so I would guess the problem is something else.

Like posted previously, why isnt it at the GM dealer?

Cheep oil could have a lot to do with it...I have seen this quite a few times. I had a few customers come in complaining about the oil light on..we changed the oil out that they bought for 97 cents a liter at Walmart and the pressure issue stopped. Some oils are not API certified.

But yes I agree...bring it in for warranty.



Cant do warranty cause the vin has been blocked by gm dealers to not do warranty work on it. The reason for this is cause it has a STS turbo system, Comp high performance, cam,lifters,and valve springs, performance tune, and also a 6inch suspension lift so with all that definitly voids the warranty. I took it in for transmission trouble and they would not do it under warranty so I had it rebuilt w/ high performance parts.

#8 txab

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Posted 12 October 2009 - 09:28 PM

Have you checked the pressure with another gauge?

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#9 Nytemare

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Posted 13 October 2009 - 01:04 PM

You have your oil return pump set to high pressure, you should also hear a buzzer when the oil pressure drops. You need it in low mode when you are low in the rpm's. There should be a switch under the dash or in the ashtray....those are the usual install places for guys with the STS kit.

It takes its oil right off the ready tap beside the filter and "steels" oil pressure when you are at low rpm's...find the switch, its there somewhere.

Edited by Nytemare, 13 October 2009 - 01:06 PM.

Posted Image

so you expected something that weights 5000 pounds and has aerodynamics of a piano to get what?


2003 Silverado XCSB, 4.8L, Flowmaster super44 SI/DO, G80 3.42, MSD Wires, K&N drop-in filter, Yellow Top Battery, Royal Purple in entire Drivetrain, W4M tune....My DD..............................SOLD
2010 Silverado XCSB 5.3L Z71 Summit White, Diablo Trinity tuned....more to come soon.
2010 Cobalt 2.2L LT 2Dr. Victory Red....gas saver/wife's Car.......SOLD
2011 Cruze 1.4L Turbo 1LT Crystal Red ...Again, Wifes car and gas saver
1978 LJ80, 16V 1600cc on 31's, Spring over lift, awaiting Full Frame off build...The Toy

#10 Nytemare

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Posted 17 October 2009 - 01:54 PM

How did everything work out??
Posted Image

so you expected something that weights 5000 pounds and has aerodynamics of a piano to get what?


2003 Silverado XCSB, 4.8L, Flowmaster super44 SI/DO, G80 3.42, MSD Wires, K&N drop-in filter, Yellow Top Battery, Royal Purple in entire Drivetrain, W4M tune....My DD..............................SOLD
2010 Silverado XCSB 5.3L Z71 Summit White, Diablo Trinity tuned....more to come soon.
2010 Cobalt 2.2L LT 2Dr. Victory Red....gas saver/wife's Car.......SOLD
2011 Cruze 1.4L Turbo 1LT Crystal Red ...Again, Wifes car and gas saver
1978 LJ80, 16V 1600cc on 31's, Spring over lift, awaiting Full Frame off build...The Toy

#11 hubob

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Posted 17 October 2009 - 06:49 PM

How did everything work out??



still low oil pressure. the STS part wasnt doing it. Its something wrong internally cuz when the engine is cold which means the oil is thicker the pressure is just below 40psi but as it warms it drops lower and lower. So I believe we are going to pull the motor take out the cam,lifters,and valve springs and replace it w/ a 6.0L and install the cam and everything into it cuz the parts are interchangable. Plus the 6.0L will bolt right up to my tranny and all the connections are the same.

#12 WilliamBos

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Posted 17 October 2009 - 07:18 PM

How did everything work out??



still low oil pressure. the STS part wasnt doing it. Its something wrong internally cuz when the engine is cold which means the oil is thicker the pressure is just below 40psi but as it warms it drops lower and lower. So I believe we are going to pull the motor take out the cam,lifters,and valve springs and replace it w/ a 6.0L and install the cam and everything into it cuz the parts are interchangable. Plus the 6.0L will bolt right up to my tranny and all the connections are the same.


When you tear into the motor, please let us know what caused the low oil pressure.

Thanks,

Will 2004 1500CC 5.3L Z71 -
320,000km/ 200,000 miles and counting.


#13 Nytemare

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Posted 17 October 2009 - 08:14 PM

Yeah....before you tear into it try running some 15W40 to see if the pressure is better...its not going to hurt anything if your tearing into it anyway.

Let me know...I am doing the STS on my truck and if its something that needs beefing up I would like to know. I may just build a 6.0L first and use that for the STS though. I was going to see if I could pick up an LQ9 for it or maybe even an LS6. Tear it apart, put some good aftermarket parts in there that will stand up to somewhere around the 2 bar mark, than I can run 14-18psi and not be worried.
Posted Image

so you expected something that weights 5000 pounds and has aerodynamics of a piano to get what?


2003 Silverado XCSB, 4.8L, Flowmaster super44 SI/DO, G80 3.42, MSD Wires, K&N drop-in filter, Yellow Top Battery, Royal Purple in entire Drivetrain, W4M tune....My DD..............................SOLD
2010 Silverado XCSB 5.3L Z71 Summit White, Diablo Trinity tuned....more to come soon.
2010 Cobalt 2.2L LT 2Dr. Victory Red....gas saver/wife's Car.......SOLD
2011 Cruze 1.4L Turbo 1LT Crystal Red ...Again, Wifes car and gas saver
1978 LJ80, 16V 1600cc on 31's, Spring over lift, awaiting Full Frame off build...The Toy

#14 desrtrat

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Posted 19 October 2009 - 04:52 PM

also check your cam bearings. you may have one going bad. not uncommon

#15 txab

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Posted 19 October 2009 - 06:43 PM

Here's one of your posts in another thread.

I have an 08 Silverado w/ the 5.3L and w/ all the mods that have been done nothing can be fixed on it under warranty. Ive been having problems w/ oil pressure so I had a buddy of mine pull the heads off and see of he could find anything wrong and what he found is a deep groove in 2 or 3 cylinder walls and we are both pretty sure there is more things wrong internally. Not sure what would of caused this but the fact of the matter is the block needs replaced at least if not more..........



If you've got deep grooves in your cylinder walls then I'd be looking into cam, main and rod bearing clearances. That's what you need to do IMHO.

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