Engine noise - lifter, rod, ?????

[mikes2nd]

could be an accessory like power steering pump or something. You really need to pin point it with a scope(you can use a long oil funnel also to get general area).

I actually like the funnel trick better to get the starting point.

 

[Geoffsfas10]

what are the chances yall think it could be the flex plate or something between the motor and trans????

today ive started to notice that in 2nd and maybe even 3rd gear at slow enough speeds, it doesnt make the noise.....

 

[iamdub]

what are the chances yall think it could be the flex plate or something between the motor and trans????

today ive started to notice that in 2nd and maybe even 3rd gear at slow enough speeds, it doesnt make the noise.....

Cracked metal can make weird noises and that's a point that'd certainly change sound with varying loads. Grab a small flathead screwdriver and bright flashlight and have a peek at it. IMO, the sound is too rhythmic to be a cracked flex plate. But, maybe it's moving and the teeth are lightly catching the starter? You'd know right away by the shiny sides of the teeth.

 

[George B]

I hate situations like this.

 

[Geoffsfas10]

Cracked metal can make weird noises and that's a point that'd certainly change sound with varying loads. Grab a small flathead screwdriver and bright flashlight and have a peek at it. IMO, the sound is too rhythmic to be a cracked flex plate. But, maybe it's moving and the teeth are lightly catching the starter? You'd know right away by the shiny sides of the teeth.

I did see that in one random find. I popped the inspection cover and the part i could see looked ok. That damn front sway bar is huge and right in the way as well.


im still not convinced its not something from the outside of the engine making the noise...especially with that it got quiet when it was raining. i might run it and spray various areas and see what happens

 

[George B]

I did see that in one random find. I popped the inspection cover and the part i could see looked ok. That damn front sway bar is huge and right in the way as well.


im still not convinced its not something from the outside of the engine making the noise...especially with that it got quiet when it was raining. i might run it and spray various areas and see what happens

Try taking the AC belt off. When mine was failing it made all sorts of strange sounds at all sorts of RPM.

 

[Geoffsfas10]

Try taking the AC belt off. When mine was failing it made all sorts of strange sounds at all sorts of RPM.

That was the one belt i did not take off. And also the first time i heard it was when the AC was on. Appears theres no tensioner for that one...should be fun to get off.

 

[George B]

That was the one belt i did not take off. And also the first time i heard it was when the AC was on. Appears theres no tensioner for that one...should be fun to get off.

The Lisle brand tool is a godsend. Get a new belt, the tool and change it.

Advance Auto Parts - Down for Maintenance

 

[mikes2nd]

yeah take the belts off start it up... I fought a sqeak for a while, turned out that it was a POS Dayco belt... I will never buy dayco again.

 

[Geoffsfas10]

You guys want to hear something weird.... its cold out now. Was 47* on the drive to work and it only makes noise between 2100 and 2500 rpm now...........

 

[George B]

You guys want to hear something weird.... its cold out now. Was 47* on the drive to work and it only makes noise between 2100 and 2500 rpm now...........

You check that AC belt yet?

 

[iamdub]

You guys want to hear something weird.... its cold out now. Was 47* on the drive to work and it only makes noise between 2100 and 2500 rpm now...........

Typically, the A/C is ran less when it's cold. Hold a steady RPM where it makes the noise or an RPM just below where it starts, even if you have to hold it in a lower gear and set the cruise, and cycle the A/C on "Max" and see if the noise changes.

 

[Geoffsfas10]

Typically, the A/C is ran less when it's cold. Hold a steady RPM where it makes the noise or an RPM just below where it starts, even if you have to hold it in a lower gear and set the cruise, and cycle the A/C on "Max" and see if the noise changes.

Oh good idea. I rarely have it on, only if its family mode, otherwise if its just me then its windows and sunroof

 

[Geoffsfas10]

Had my fleet mechanic listen to it. He says he thinks its flexplate or torque converter. Has also said every one of the Chevy's we've used at work junks them at 90-130K

 

[iamdub]

Had my fleet mechanic listen to it. He says he thinks its flexplate or torque converter. Has also said every one of the Chevy's we've used at work junks them at 90-130K

You said you didn't see anything. But, maybe he could? Did he look or just listen?

 

[Geoffsfas10]

You said you didn't see anything. But, maybe he could? Did he look or just listen?

He listened. Im going to spend more time looking at it closer.

 

[mikes2nd]

oh shit... you got me thinking flex plate also... mine makes noise when cold on startup, a ticking, takes a while to go away...

I think i will put a camera up in there and start looking at the flex plate

 

[iamdub]

oh shit... you got me thinking flex plate also... mine makes noise when cold on startup, a ticking, takes a while to go away...

I think i will put a camera up in there and start looking at the flex plate

Checked for exhaust leak? Much more common and presents the same "ticks when cold..." symptoms.

 

[mikes2nd]

Checked for exhaust leak? Much more common and presents the same "ticks when cold..." symptoms.

yeah I already fixed the 3 broken exhaust manifold bolts.... do the 2007s have a flex plate issue? I see lots of pre 2007 flexplate issue. this is the 6.2

 

[donjetman]

yeah I already fixed the 3 broken exhaust manifold bolts.... do the 2007s have a flex plate issue? I see lots of pre 2007 flexplate issue. this is the 6.2

I've been on this forum for a few yrs and haven't heard of flex plate problem(s). We have a 07 6.2 Denali.