MY CADILLAC CTS

  • Tiny
  • albert capobianco
  • 2006 Cadillac CTS
  • 6 CYL
  • 2WD
  • automatic
  • 65,500 miles

When I first start up my 2006 Cadillac CTS, the vehicle runs rough and I hear a rattling sound. After a while I drive the car and it seems find. There must be a problem, but I need some type of an answer before I bring it in to Cadillac for repairs.

Saturday, June 4th, 2011 AT 4:03 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 43,032 posts

It could be a vacuum leak as the computer takes over when it's almost warmed up. Check for a vacuum hose off or a split one or broken one. Alot of them are plastick andcan be repaired at the break with a pieceo fhose going ove r it. The rattle may be the heat shield has broken loose over the converter. You'll have to crawl uner it and look.

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Saturday, June 4th, 2011 AT 11:14 PM

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