Unseated Exhaust Pipe Connector Leak

An exhaust leak or noisy exhaust, sometimes described as a rattle or rumble, most noticeable on a cold start may be found on some 2014-2017 Silverado 1500 and 2015-2017 Escalade, Suburban, Suburban 3500, Sierra, and Yukon models. The exhaust leak may be due to an unseated pipe-to-pipe mid-joint connection. (Fig. 9)



Fig. 9


To correct the exhaust leak, remove the exhaust band (Norma) clamp and install a new exhaust band (Norma) clamp to the pipe joint.


When installing the new clamp, firmly push the pipes together and maintain the connection while tightening the exhaust band clamp bolt to 30 Nm (22 lb.-ft.).


The clamp does not need to be perpendicular to the pipe. (Fig. 10) Confirm the clamp edges are fully seated on the pipe on both sides all the way around the clamp. Once the new clamp is installed, run the engine and inspect the clamp joint to ensure there are no exhaust leaks.



Fig. 10


– Thanks to Richard Renshaw

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