bpretty21 Posted February 28, 2010 Report Share Posted February 28, 2010 2003 cts misfire on cylinders 1,3 and 5. replaced coil pack, plugs, igition coil, still no luck. what else can I have done? my car has been in the shop for over a month. please any info will help! Link to comment Share on other sites More sharing options...
bpretty21 Posted February 28, 2010 Author Report Share Posted February 28, 2010 2003 cts misfire changed coil packs, igition coil, sensor, done compression test...what else can i have done. Link to comment Share on other sites More sharing options...
BodybyFisher Posted February 28, 2010 Report Share Posted February 28, 2010 Spark plugs that are cracked or carbon tracking, bad injector If that does not help check for a vacuum leak Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Texas Jim Posted March 1, 2010 Report Share Posted March 1, 2010 If I am not mistaken...1,3 and 5 are all on the same bank. You have replaced the coil pack, plugs and ignition coil. You need to look for something COMMON to that bank..and "NOT" common to the other bank. The only thing that comes to mind, off the top of my head...is intake gaskets. Link to comment Share on other sites More sharing options...
bpretty21 Posted March 2, 2010 Author Report Share Posted March 2, 2010 ok i will pass that info on the the mechanic, i will post when i find out what happens. thanks so much. Link to comment Share on other sites More sharing options...
MargusR82 Posted March 26, 2010 Report Share Posted March 26, 2010 ok i will pass that info on the the mechanic, i will post when i find out what happens. thanks so much. Hello, I´m the CTS owner from Estonia and have the same problem - 2,4,6 cylinders misfire. I drove, accelerated a little on the road and after stop and starting eninge again, then computer in the service showed that 2,4 and 6 are misfiring. Did You get the solution for this problem??? Margus From Estonia Link to comment Share on other sites More sharing options...
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