Engine Tick - 2015 GMC Sierra 5.3

[Spastik Monkey]

I'm gonna jump in. Ive got the flutter. Sounds metallic. I hear it usually going up a hill right before a downshift. 1500-1800rpm. It's usually when the truck is warm. Sounds like footwell. I recently put on LTs, and the sound is still present. Is this different than everyone else's noise?

[Blksilverado31]

Will exhaust upgrade help cover the DI tick?

[Spastik Monkey]

I've got a MBRP cat back coming. I'll report if anything changes after it goes on.

[Blksilverado31]

The tick drives me crazy when I walk around truck to get in it. Or in a drive through. ?

[Miallterain18]

2 hours ago, Spastik Monkey said:

I'm gonna jump in. Ive got the flutter. Sounds metallic. I hear it usually going up a hill right before a downshift. 1500-1800rpm. It's usually when the truck is warm. Sounds like footwell. I recently put on LTs, and the sound is still present. Is this different than everyone else's noise?

My truck is the same thing any time in v4 once hot around 1500-1800 rpms. A metallic sound or a sewing machine is what it sounds like to me. 

[Spastik Monkey]

9 minutes ago, Miallterain18 said:

My truck is the same thing any time in v4 once hot around 1500-1800 rpms. A metallic sound or a sewing machine is what it sounds like to me. 

The dealer told me it was the exhaust flapper. I heard it in one of my loaners too. The catback I'm getting deletes that. I also have AFM disabled.

[MOhunter92]

It’s not the flapper, that’s right next to the muffler. The sound we’re talking about comes from the driver side footwell distinctly, and sounds exactly like an exhaust leak. It is not DI or pinging. It comes and goes when the truck gets jostled. I’m convinced there is a defect in the driver side catalytic converter causing this sound.


Sent from my iPhone using Tapatalk

[Spastik Monkey]

4 minutes ago, MOhunter92 said:

It’s not the flapper, that’s right next to the muffler. The sound we’re talking about comes from the driver side footwell distinctly, and sounds exactly like an exhaust leak. It is not DI or pinging. It comes and goes when the truck gets jostled. I’m convinced there is a defect in the driver side catalytic converter causing this sound.


Sent from my iPhone using Tapatalk

Well, I got rid of the stock cats with the LTs and I still hear it.

[Miallterain18]

17 minutes ago, MOhunter92 said:

It’s not the flapper, that’s right next to the muffler. The sound we’re talking about comes from the driver side footwell distinctly, and sounds exactly like an exhaust leak. It is not DI or pinging. It comes and goes when the truck gets jostled. I’m convinced there is a defect in the driver side catalytic converter causing this sound.


Sent from my iPhone using Tapatalk

I am almost wondering if it's some sort of sensor or wiring connection relay that causes this. Maybe it has a hard time supporting electric load right before switch over or under heavy v4 load, and as a result it causing a tick (this is just a theory). Could be tucked up under the dash and not even in the engine bay at all.

[MOhunter92]

Well, I got rid of the stock cats with the LTs and I still hear it.

Damn.. it’s so weird. I can’t think of anything else then. It’s definitely not pinging or anything else motor related. Another member had all of his lifters replaces and it was still there.. it’s completely related to acceleration and 4 cylinder mode, and hitting bumps can make it start and stop.


Sent from my iPhone using Tapatalk

[MOhunter92]

I am almost wondering if it's some sort of sensor or wiring connection relay that causes this. Maybe it has a hard time supporting electric load right before switch over or under heavy v4 load, and as a result it causing a tick (this is just a theory). Could be tucked up under the dash and not even in the engine bay at all.

Maybe.. I can’t think of anything else! ?


Sent from my iPhone using Tapatalk

[Miallterain18]

1 minute ago, MOhunter92 said:

 

Maybe.. I can’t think of anything else! ?


Sent from my iPhone using Tapatalk

 

Ram had an issue with their headlights the supplier switched the wire after testing to save money but the new wire cant support full load resulting in a dimmer output,  at this point with all the work that people have had done and all the replaced parts and the tick is still there, and in almost all v8's from the trucks to suvs even the corvettes I'm almost willing to put money on the issue is a wire harness or relay under that dash that was changed after testing that causes this tick when the load is in the extremes of its capacity.

[MOhunter92]

Ram had an issue with their headlights the supplier switched the wire after testing to save money but the new wire cant support full load resulting in a dimmer output,  at this point with all the work that people have had done and all the replaced parts and the tick is still there, and in almost all v8's from the trucks to suvs even the corvettes I'm almost willing to put money on the issue is a wire harness or relay under that dash that was changed after testing that causes this tick when the load is in the extremes of its capacity.

Would that explain it correlating exactly with the RPM?


Sent from my iPhone using Tapatalk

[PackerChev]

Hardest noise in the world to figure out! I’ll buy a case of busch light for the guy who figures it out! 

[Miallterain18]

On 3/11/2018 at 12:16 AM, MOhunter92 said:

 

Would that explain it correlating exactly with the RPM?


Sent from my iPhone using Tapatalk

 

It could, the electric load running through the wire or relay  would most likely increase under load and right before transition to v8. If something was changed and made of a lesser quality the tick could occur from that.