Exhaust problem

[78gmcroyale]

Well I no longer have exhaust noise but I still don't know what the problem was. Earlier this week on the side of the new muffler I replaced the
remflex exhaust manifold gasket and the down pipe donut. No change in the noise. To give you an idea of the noise I had my neighbor thought it was a
rod knock
Today I replaced the drivers side remflex exhaust manifold gasket, down pipe donut (both looked fine) and I replaced that muffler with a new one. Get
it all back together and all is quiet, no more rat tat tat sound. Only thing I can think of is the mis-match of a new and old muffler causing some
weird harmonic sound. But whatever it was, I'm happy it's fixed.
Thank for all of your help and input.
Ray
--
Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431

 

[john r. lebetski]

So the second muffler you removed looked ok on the outside, but replacing it fixed the problem? Since the other side muffler failed one would think
the other was not far behind. Maybe internal fail instead of external. I’d cut a 12 x 6 window in the sheet metal with cut off wheel and examine.

--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[78gmcroyale]

I plan to do that.Sent from my U.S.Cellular© Smartphone
-------- Original message --------From: "John R. Lebetski via Gmclist" Date: 6/11/20 3:51 PM (GMT-06:00) To: gmclist Cc: "John R. Lebetski" Subject: Re: [GMCnet] Exhaust problem So the second muffler you removed looked ok on the outside, but replacing it fixed the problem?  Since the other side muffler failed one would thinkthe other was not far behind.  Maybe internal fail instead of external.  I’d cut a 12 x  6 window in the sheet metal with cut off wheel and examine.  -- John LebetskiWoodstock, IL77 Eleganza II_______________________________________________GMCnet mailing listUnsubscribe or Change List Options:http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org