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Engine is making a tapping noise in lower rear 08 4.8 L. 66…

Customer Question
Engine is making a...

Engine is making a tapping noise in lower rear 08 4.8 L

Mechanic's Assistant: How many miles are on the car? Is it an automatic or a manual transmission?

66 000

Mechanic's Assistant: What is the model of your '08 GM?

Yes

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

No i am not its at a repair shop they thought it was the flywheel was cracked. not it ?

Submitted: 4 months ago.Category: GM
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Answered in 4 minutes by:
3/23/2018
GM Mechanic: Jerry Newton, GMC Technician replied 4 months ago
Jerry Newton
Jerry Newton, GMC Technician
Category: GM
Satisfied Customers: 5,694
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Verified

They can run the engine without the transmission installed if they put the starter back on it. I have been known to do this to find noises like this, I would make very sure of the source of this noise before putting the transmission back in it. The flywheel can have tiny cracks in it that are almost impossible to see, if the noise is gone with the transmission removed, it probably is the flex plate (since the torque converter isn't connected to it and making it flex).

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GM Mechanic: Jerry Newton, GMC Technician replied 3 months ago

Did you get anywhere with this?

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