Can someone please tell me what this noise is!? - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 18 (permalink) Old 01-28-2019, 12:09 PM Thread Starter
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Question Can someone please tell me what this noise is!?

So a couple of weeks ago, my truck started making this short "pew" noise directly after it starts when the engine is cold. Only last like a second and it happens just as soon as I release the key from starting. Seems to be worse if its colder outside but will even do it when its above 60F. Once the truck has been driven and reached operating temp, it will not make the noise when you start it again. the truck pretty much needs to sit for a day and completely cool to make the noise. The truck starts just fine, runs and idles just fine. I have an Insight CTS and all temps and pressures are the same as they always have been. The truck is up to date with all maintenance. I have realized though that the noise started directly after an oil change! I changed my oil on the 5th and I first heard the noise on the 9th and its very possible that I didn't drive any between those days. Changed oil with 10qts of Rotella 5w40 and a Mobil 1 filter, same as always. The only thing I did different was I changed out my factory oil drain plug with a PPE magnetic plug. Feel like this shouldn't be related but its the only thing "different" I did during the oil change. Please see link for video of noise.


2011 LML Silverado 2500HD CCSB Z71, Leveled, Bagged, AFE DFS780 Lift Pump, B&W Companion.
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post #2 of 18 (permalink) Old 01-28-2019, 12:11 PM Thread Starter
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OH! Forgot to mention that I recently (after the noise started) changed my belt, both idlers, and the tensioner. So the noise should not be belt related unless the alternator or power steering pump is causing it.

2011 LML Silverado 2500HD CCSB Z71, Leveled, Bagged, AFE DFS780 Lift Pump, B&W Companion.
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post #3 of 18 (permalink) Old 01-28-2019, 04:28 PM Thread Starter
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Anyone have any ideas?

2011 LML Silverado 2500HD CCSB Z71, Leveled, Bagged, AFE DFS780 Lift Pump, B&W Companion.
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post #4 of 18 (permalink) Old 01-29-2019, 09:41 AM Thread Starter
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Bump

2011 LML Silverado 2500HD CCSB Z71, Leveled, Bagged, AFE DFS780 Lift Pump, B&W Companion.
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post #5 of 18 (permalink) Old 01-29-2019, 02:05 PM
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lift pump?
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2010 Gmc 2500 Duramax 853,500 Odometer miles - sold Nov 2018

2013 LT CCSB SRW bought with 508,000 miles, now over 666,000 miles

2013 CrewCab and chassis with 9' Hillsboro aluminum flatbed 84,000 miles. - Sold Sept 2019
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post #6 of 18 (permalink) Old 01-29-2019, 02:46 PM
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My 12 will cycle turbo vanes right after started. MAYBE this is what you are hearing.

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post #7 of 18 (permalink) Old 01-29-2019, 02:48 PM
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Quote:
Originally Posted by chevor View Post
lift pump?
yeah, sounds alot like my lift pump only mine is about 3 times louder than that....
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post #8 of 18 (permalink) Old 01-29-2019, 04:54 PM
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I've seen lift pumps wired into a "HOT" that goes cold when the key is in the "START" position... so you turn the key on to RUN and the pump starts and builds pressure. Then when you hit "START" the engine cranks, but the pump shuts off and the pressure falls. When you release the key back to RUN, the pump restarts. Maybe this is the "pew" sound you hear.

Its pretty easy to trouble shoot it, just pull the fuse out and see if the noise stops.
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post #9 of 18 (permalink) Old 01-29-2019, 06:01 PM Thread Starter
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Quote:
Originally Posted by chevor View Post
lift pump?
I have considered this as well. The lift pump has been installed for about 3-4 months and I don't ever recall hearing this. But it is worth looking into. I am considering picking up a cheap mechanics stethoscope to see if that will help track it down. Truck runs too well for it to be anything serious. Would just like to know what the heck it is.

2011 LML Silverado 2500HD CCSB Z71, Leveled, Bagged, AFE DFS780 Lift Pump, B&W Companion.
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post #10 of 18 (permalink) Old 01-29-2019, 06:02 PM Thread Starter
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Originally Posted by Riley 1820 View Post
My 12 will cycle turbo vanes right after started. MAYBE this is what you are hearing.
Nah, my veins cycle all the time. Im use to that noise, this is different

2011 LML Silverado 2500HD CCSB Z71, Leveled, Bagged, AFE DFS780 Lift Pump, B&W Companion.
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