Tapping getting louder. Can’t pinpoint and have tried stethoscope to no avail.

[iboughtatahoe23]

Grab a black sharpie, 1/2 drive ratchet or breaker bar, short extension and (i think) 1-1/16" socket and mark the flexplate with a sharpie. The slowly turn the engine over (go 1/4 of a revolution then reinspect the flexplate. Turn it over again 1/4 rev and reinspect. Keep turning until you see your mark so you know you'vegone one complete turn.

Ill take a video of my tahoe's ticking sound and post it later in this thread so you can compare it to yours to see if they sound the same to you

Is it important to return it to the original position? Is that the reason for the sharpie?

 

[NickTransmissions]

Is it important to return it to the original position? Is that the reason for the sharpie?

Yes. Helps you keep track so you know you've inspected the entire flex plate.

The process/concept itself is called indexing. Get used to it because you'll be doing it frequently during the course of various repairs.

 

[Geotrash]

Is it important to return it to the original position? Is that the reason for the sharpie?

It's just so you know that you were able to inspect the whole thing. When the mark returns to the window, you saw the whole thing 1/4 turn at a time.

 

[NickTransmissions]

Is it important to return it to the original position? Is that the reason for the sharpie?

Do you have the factory service manual or any repair manual for your vehicle (Haynes, Chilton, etc)?

 

[iboughtatahoe23]

Do you have the factory service manual or any repair manual for your vehicle (Haynes, Chilton, etc)?

I don’t

 

[iboughtatahoe23]

It's just so you know that you were able to inspect the whole thing. When the mark returns to the window, you saw the whole thing 1/4 turn at a time.

Ok what things can I diagnose with the flywheel or rule out?

 

[NickTransmissions]

I don’t

Buy one immediately!
Like this week or today...

I'd recommend the Haynes manual if there's one available for your Tahoe. You can buy them at Autozone or on line like Amazon or eBay.

You're flying blind without a manual and driving yourself nuts in the process. Plus starting multiple threads on the same subject with the same questions that can easily be found in a repair manual isnt helping you or us.

You need to get a lot more familiar with your vehicle than you are at present unless you simply plan to outsource everything to a shop, even things like oil changes. For example, you werent sure if you needed to pull the transmission pan off to inspect the flex plate. A manual would have answered that question for you.

You dont need to worry about major repairs at first, just start at the basic maintenance (fluids, filters, brake jobs, simple diagnosis like reading oil, fuel pressure and vacuum, etc.

You have a code reader so being able to pull codes is covered. But you need the manual to know how to complete repairs based on whatever goes wrong or if/when your tahoe generates codes.

 

[NickTransmissions]

Ok what things can I diagnose with the flywheel or rule out?

If the flywheel isnt cracked (assuming you're able to see all of it), you can rule it out as a potential source of symptoms.

 

[Geotrash]

Ok what things can I diagnose with the flywheel or rule out?

What Nick said. The flex plate is a common source of ticking/rattling noises. Check YouTube for cracked flex plate sounds.

 

[swathdiver]

I don’t

AllDataDIY for an online subscription is also an option.