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Whistle sound, Oil pressure

Jer4251

By Jer4251
in Troubleshooting & Recalls

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20L8TSierra24 Senior Enthusiast

20L8TSierra24

Posted
Posted

Clamped off the valve, whistle gone. I bet the whistle is one of the condensation holes on the muffler or resonator.

  • 2 weeks later...
  • Replies 31
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VMaxtastic Enthusiast

VMaxtastic

Posted
Posted

My oil pressure maxes right out when I get on the gas with my 5.3... I found it strange, but figured it was normal.

ddmcs14 Enthusiast

ddmcs14

Posted
Posted

So my clamp came loose on mine and that was causing the whistling noise. I need to so the bolt method

 

 

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Dnt Senior Enthusiast

Dnt

Posted
Posted

Like others said oil pressure sounds fine. I'd be more worried about your buddy's that doesn't move.

Really? Mine (5.3) typically sets right at 40 except when at idle it drops back slightly to 35 or so. May have to start a survey on this...........

j13smiley Enthusiast

j13smiley

Posted
Posted

i think most people hover around 40.. it should move some depending on temp or load. your's drops down to 35 and back just above 40 i'd say you are normal.

 

there have been other guages from gm that really don't move at all (engine temp in fbody cars for example). perhaps his buddy meant it doesn't move much and usually "hovers" around 40.

Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted

My current 2014 5.3 behaves just as my 2007 5.3 did and that is that the oil pressure gauge hovers around 40, but does fluctuate. If i step on it and really give it some gas, it will move up a bit and settle back down once I reach cruising speed. When I'm idling, especially when it's colder outside, it will drop below 40 a bit. All of that is normal. If the needle never moves, something is wrong, and if it fluctuates extreme in either direction, you should get that looked at as well.

 

Side comment: I love how GM installs this stupid flapper valve on the exhaust trying to make the truck quieter and nobody likes it. I'm going to bolt mine open as well as soon as I get a free Saturday to do it. I miss that stock throaty exhaust sound of every GM truck/SUV built before this model.

jrsmall0221 Enthusiast

jrsmall0221

Posted
Posted

I have the whistle also. I plan on addressing it with dealer at first service. I have less than 2k on the truck so far.

 

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20L8TSierra24 Senior Enthusiast

20L8TSierra24

Posted
Posted

I have the whistle also. I plan on addressing it with dealer at first service. I have less than 2k on the truck so far.

 

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Clamp the adaptive valve open and it'll be gone.
jrsmall0221 Enthusiast

jrsmall0221

Posted
Posted

Clamp the adaptive valve open and it'll be gone.

I read somewhere that there is a service bulletin on this. clamping the valve open is a test to identify a problem? If a problem is identified, the fix is a new exhaust system?

 

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chuckl1218 Senior Enthusiast

chuckl1218

Posted
Posted

I read somewhere that there is a service bulletin on this. clamping the valve open is a test to identify a problem? If a problem is identified, the fix is a new exhaust system?

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Go to the link in post 17 above ...it describes the test procedure including a workaround...if resolves the problem, syas to replace the exhaust system. This link IS the bulletin.
jrsmall0221 Enthusiast

jrsmall0221

Posted
Posted

Go to the link in post 17 above ...it describes the test procedure including a workaround...if resolves the problem, syas to replace the exhaust system. This link IS the bulletin.

Thanks. I knew I read it on here somewhere. I just didn't have time to look it up when I wrote that post.

 

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  • 1 month later...
jeffsig Enthusiast

jeffsig

Posted
Posted

Are dealers replacing the exhaust system due to the whistle?

MJFlores Enthusiast

MJFlores

Posted
Posted

I would just bolt it open and call it good. I did this to stop my whistle sound. The truck sounds better, the whistle is gone, there's no chance of the valve freezing shut in the winter (they do freeze shut and will cause no starts). After driving it for almost 2 months with the valve bolted open, I can honestly say I have no idea why that valve is even there. Alledgedly it's to reduce "drone" in V4 mode, but mine is open and I have no drone at any speed. I may even be getting slightly better gas mileage.

  • 1 year later...
Venom Shock New Member

Venom Shock

Posted
Posted

I have a 2015 Z71 5.3, 6 speed that whistles on acceleration, dealer says its the transmission and it's normal, I call BS...any suggestions?

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