2006 Cadillac DTS Posted November 28, 2018 Report Share Posted November 28, 2018 2006 dts rough idle all the time cold or hot. No codes. Replaced 3 coils. No change. Need help. Thanks. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 28, 2018 Report Share Posted November 28, 2018 Interesting that there are no codes. Not even history codes? How did you determine that? Does the Check Engine Light flash while driving? If there are in fact no codes, typically a fuel problem is the cause. Check fuel pressure, check the fuel pressure regulator. How does it accelerate when pushed hard? 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...
Logan Posted November 28, 2018 Report Share Posted November 28, 2018 Which 3 coils and why those 3? You really need a scan tool that can display misfires. Most cheap scan tools will not. Without being able to see which ones.....you are just guessing. Attached is pic of a GM Tech 2 displaying the misfire graph. Wifes Traverse just needed 2 coils on Sunday when she got home from out-of-town.....very clear to see on the Tech 2....2 cylinders with multiple misfires under load....one coil was noticeably worse than the other. To my surprise....took forever for the SES lamp to finally show a misfire code. (picture is old photo I have...not of the Traverse coils). Logan Diagnostic LLC www.airbagcrash.com www.logandieselusa.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
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