stswulf Posted April 16, 2008 Report Share Posted April 16, 2008 engine rattle at cold starts and when accelerating its a very distinctive "clack -clack-clakc" Link to comment Share on other sites More sharing options...
Cadillac Jim Posted April 16, 2008 Report Share Posted April 16, 2008 Possible causes that come to mind: Exhaust leak or cracked exhaust manifold. Motor support loose, with something touching. Loose flywheel bolt(s). I'm assuming that you have run the codes and don't see anything, and that you're sure that you don't have a really bad carbon build-up. I suggest that you raise the hood before you start it one fine morning and find out what part of the engine that it's coming from. A wooden dowel or an 18" socket extension to use as a contact stethoscope might be useful. If it's in warranty, finding out where the noise is, or even exactly what it is, is a good move. I once had a dealer change my cat on warranty for what turned out to be a bent heat shield rattling against the exhaust pipe, which they didn't fix -- I pushed it with my thumb later. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
stswulf Posted April 16, 2008 Author Report Share Posted April 16, 2008 how do I check da codes? Link to comment Share on other sites More sharing options...
jking220 Posted April 16, 2008 Report Share Posted April 16, 2008 Scroll to top... click on caddyinfo.com to far left... click on "How to"... then go to "reading self diagnosis codes"... there is alot of other useful info in the how to section. Post your codes here if you cannot find what they mean. Jonah Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted April 17, 2008 Report Share Posted April 17, 2008 To check the codes on the 3.6L cars you call onstar and ask them. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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