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Diagnose Engine Noise

trucc_boi

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trucc_boi Enthusiast

trucc_boi

Posted
Posted

 

 

Howdy guys. I love my truck. I've worked on it to keep it in the best shape I can but engine work is outside of my realm of expertise.

 

It developed this noise a few months ago. Seems like after my last oil change. I have kind of ignored it hoping it will go away but it's there.

 

I ran some fuel injector cleaner through a tank and put about half a quart of Marvel Mystery Oil in the oil and drove about 50 miles so far but it hasn't changed.

 

Any ideas, thoughts, suggestions? I bought this truck to last and I need it to get to at least 200,000!

 

2007 NNBS Silverado with AFM and ~126,000 miles.

  • 3 weeks later...
muddkatt Senior Enthusiast

muddkatt

Posted
Posted

Not sure what noise you are referring to, but I do hear lifter tick. Its hard to determine what noise is what from a video.

If it's the lifter tick you are referencing, then its probably the AFM lifters crapping out.

mj0528 Enthusiast

mj0528

Posted
Posted

Sounds ok from what I hear

 

5.3 often has a little tick to it. Could be injectors from

What I've read

 

 

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EngineNoO9 Enthusiast

EngineNoO9

Posted
Posted

My 07 avalanche developed a similar noise but it ended up being the power steering pump. I suspected lifters at first but noticed the sound varied with my steering input.

 

If it is lifters, try some sea foam for the next few oil changes. That may quiet it down. And a dumb but honest question, have you checked to make sure the oil is at the full mark? Ive had on other cars the noise increase if it's not filled up all the way.

sporty061200r Enthusiast

sporty061200r

Posted
Posted

My 11 Silverado 5.3 has a light tick until I run E85 I believe some of my tick was fuel knock I could be wrong but my truck runs a lot better and sounds quiter on E85

 

 

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swathdiver Senior Enthusiast

swathdiver

Posted
Posted

Use a 3/8" extension as a stethescope, touching it to various parts of the motor and accessories with the other end to your ear. You'll pinpoint the are pretty quick that way.

mj0528 Enthusiast

mj0528

Posted
Posted

Fuel injector sometimes makes that noise. Mix some seafoam, B12 or Techron in it and also use top tier gas (Exxon, Shell...) and it will sound normal again. But I think the normal for the 5.3 is to tick a little. That's not lifter noise. Lifter noise is louder and is undeniable. That is fuel injectors most likely

 

 

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eddiefromcali Enthusiast

eddiefromcali

Posted
Posted

you could remove the valve covers and rockers and spray B12 down the pushrods to help clean out the lifters...would rule that out. No need for new gaskets as they are reusable.

mj0528 Enthusiast

mj0528

Posted
Posted

you could remove the valve covers and rockers and spray B12 down the pushrods to help clean out the lifters...would rule that out. No need for new gaskets as they are reusable.

How hard of a job is that? If I don't have MMO in my gas, I get the same noise. 4oz per 10 gallons of top tier makes it quiet so my possible issue is probably diff but wonder how big of a job that is to do. B12 is good stuff! Much cheaper than seafoam

 

 

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eddiefromcali Enthusiast

eddiefromcali

Posted
Posted

How hard of a job is that? If I don't have MMO in my gas, I get the same noise. 4oz per 10 gallons of top tier makes it quiet so my possible issue is probably diff but wonder how big of a job that is to do. B12 is good stuff! Much cheaper than seafoam

 

 

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check this out...its real easy

 

 

eddiefromcali Enthusiast

eddiefromcali

Posted
Posted

if you do spray B12 down there, make sure to change the oil right after....you don't want that stuff floating around in the crankcase. Before I swapped heads and did new cam/lifters, I had a slight tick...MMO in the crankcase would get rid of it. Might be worth a try for you

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