Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

Results 1 to 12 of 12

Thread: Who else has had random Misfire issues? 2006 DTS

  1. #1
    DTSon20's is offline Cadillac Owners Member
    Automobile(s): 2006 Cadillac DTS
    Join Date
    May 2014
    Posts
    1

    Who else has had random Misfire issues? 2006 DTS

    Hey guys and Gals.

    I own a 2006 DTS with 148k miles. Car has been great with hardly any issue. I keep up with maintenance on this car and it's in great shape.


    But I have developed this issue these last few months. Before I dive into this situation fully, I'm looking to see if anyone else has had this issue to point me in the right direction.

    Issue is MISSFIRE.

    At idle or slight acceleration, I get random misfiring. Usually it's there, 80% of the time, sometimes it's not. PCM will not tell me which cylinder, just the p0300 code, which I erased with Hptuners, didn't want to loose my remote startup.

    I've changed plugs, and checked wiring, all looks good. After I changed plugs the misfire did go away for about 1 week, then came back.

    Before I buy coil's, and or clean and change injectors, just wondering if anyone else has had this issue.

    Since it comes and goes, I'm thinking possible bad ground, or wiring issue. It also seems to be worse when the engine is hot.

    I know people will say, check coils and possibly change them, change fuel filter, run injector cleaner, use proper spark plugs, etc etc. Hoping to see if someone had same issue and solved it, what was their solution..

    Regardless if people chime in or not, I'll let people know what I discovered.

    Thanks !

    clint


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    tjwhite721's Avatar
    tjwhite721 is offline Cadillac Owners Fanatic
    Automobile(s): 2006 Cadillac DTS, 1999 Cadillac Seville
    Join Date
    Jul 2008
    Location
    Bloomsburg,PA
    Posts
    315
    Change the coils and boots

  4. #3
    Superjim's Avatar
    Superjim is offline Cadillac Owners Connoisseur
    Automobile(s): 2011 DTS Platinum
    Join Date
    Jun 2006
    Location
    Ft. Worth
    Age
    72
    Posts
    4,633

    Re: Who else has had random Misfire issues? 2006 DTS

    Before changing anything and spending a lot of money that may not need to be spent...CHECK THE PLUG BOOTS really good.
    Look for any tears/splits and bad places.
    Also look for carbon tracks INSIDE the boot.
    Any doubt about the boot, replace it.

  5. #4
    Tom's Caddy's Avatar
    Tom's Caddy is offline Cadillac Owners Enthusiast
    Automobile(s): 2005 CTS/ 2008 DTS/ 2008 STS V8 N*/ 2011 CTS4 ALL W/D Pearl
    Join Date
    Jul 2012
    Location
    Ontario, Canada
    Posts
    684

    Re: Who else has had random Misfire issues? 2006 DTS

    My car runs great. But I do have at idle a slight cough I will call it a drop of about 50 RPM after the car is at a stop light for about 15 seconds. After the cough the car stays at idle as long as I want at the new RPM lets guess and say 610. No problem on acceleration and when I come to another stop the idle will be back at 650 RPM then drop down back to 610 after 15 seconds but NOT ALWAYS.

    I have NO CODES.

    Have you ever had this drop in RPM?

    Could this have been the start leading to you having a miss now?

    I would find which cylinder is missing before you do anything else. A OBDll reader are only $40-$60 now if you find one on sale and it will tell you which cylinder like P0340 meaning #4 cylinder.

    Auto Zone will tell you for free.

    I wish I could be more help but I'm also looking for help from you.

  6. #5
    Phatalac is offline Cadillac Owners Fanatic
    Automobile(s): 2006 DTS LUX III
    Join Date
    Oct 2011
    Age
    27
    Posts
    130

    Re: Who else has had random Misfire issues? 2006 DTS

    same issues here all plugs done 3 coil packs replaced and still needing more, the car from time will miss so hard it jolts foward in traffic. no CEL or any other clues.

  7. #6
    Andrew224's Avatar
    Andrew224 is offline Cadillac Owners Fanatic
    Automobile(s): '41 67, '66 75, '02 Deville-L, DTS, DTS-L, XTS, '08 Escalade
    Join Date
    Apr 2012
    Location
    Plainfield, IL
    Age
    37
    Posts
    132

    Re: Who else has had random Misfire issues? 2006 DTS

    I had something similar before with an '06 DTS. After changing the secondary air injection valve, the spark plugs, and an ignition coil, the problem persisted but it was intermittent and might make the car die when I came to stop maybe once a week. Acceleration from a stop was jumpy too. No codes were shown. I took the car into Cadillac and a technician drove the car around for a few days with diagnostic equipment hooked up to the car to catch it when it would die out.

    MAP sensor was found to be out of spec and causing the problem but not out of spec enough to trip a code Circled below on the picture.

    http://www.rockauto.com/catalog/more...376&cc=1432039

    The sensor is about $50 for an AC Delco part and is very simple to replace (1 bolt, 1 electrical connection). In my book, it might be worthwhile to change it to see if it clears up the issue. In my case, I paid Cadillac $600 or so to diagnose and fix the problem.

    If that doesn't work, the next thing I would try is replacing the upstream O2 sensors because I've heard about someone else having similar problems with no codes being tripped and the O2 sensors were replaced, clearing up the problem.

    The MAF might be another sensor to consider changing too if the problems persist.

    If you can do the work yourself and don't want to pay a technician to properly diagnose the issue, I say it's worth it to try swapping these sensors out. These are all sensors that eventually wear out.
    Attached Images

  8. #7
    stormnn's Avatar
    stormnn is offline Cadillac Owners Fanatic
    Automobile(s): 06 Cadillac DTS
    Join Date
    Sep 2008
    Location
    Bowmanville Ont. Leesburg Fl.
    Age
    73
    Posts
    278

    Re: Who else has had random Misfire issues? 2006 DTS

    Changed my MAP sensor yesterday. Took a 60 mi. run today. Intermittent slight hesitation when coming back on the throttle at any speed is gone.
    Also when I was in there I checked the intake bolts again, found 2 I could finger tight, tightend them a year ago. Wonder if I should take them out 1 at a time & locktite them?
    Norm

  9. #8
    Tom's Caddy's Avatar
    Tom's Caddy is offline Cadillac Owners Enthusiast
    Automobile(s): 2005 CTS/ 2008 DTS/ 2008 STS V8 N*/ 2011 CTS4 ALL W/D Pearl
    Join Date
    Jul 2012
    Location
    Ontario, Canada
    Posts
    684

    Re: Who else has had random Misfire issues? 2006 DTS

    I think you have to remove the fuel rail to pull all 10 out Norm.

    Great news on the sensor.

  10. #9
    Phatalac is offline Cadillac Owners Fanatic
    Automobile(s): 2006 DTS LUX III
    Join Date
    Oct 2011
    Age
    27
    Posts
    130

    Re: Who else has had random Misfire issues? 2006 DTS

    i think you may be onto some thing there you just described my problem to a damn TEE!

  11. #10
    Andrew224's Avatar
    Andrew224 is offline Cadillac Owners Fanatic
    Automobile(s): '41 67, '66 75, '02 Deville-L, DTS, DTS-L, XTS, '08 Escalade
    Join Date
    Apr 2012
    Location
    Plainfield, IL
    Age
    37
    Posts
    132

    Re: Who else has had random Misfire issues? 2006 DTS

    I used the Standard Motor Products MAP ($31 from RockAuto) the last time I replaced a MAP in my remaining '06 DTS. Part was $20 cheaper and was shipping from the same warehouse that I had ordered other parts from through RockAuto and it works just fine.

    http://www.rockauto.com/catalog/more...828&cc=1432039

    It takes less than 5 minutes to change this sensor.

    1. Remove electrical connection from sensor.

    2. Remove 10mm bolt from bracket that holds sensor in place.

    3. Lift sensor out.

    4. Replace in reverse order.
    Attached Images

  12. #11
    BlueAngel#07's Avatar
    BlueAngel#07 is offline Cadillac Owners Connoisseur
    Automobile(s): 2008 DTS PERFORMANCE
    Join Date
    Feb 2013
    Location
    Minnesota
    Posts
    1,110
    Clean the dusty engine!

  13. #12
    ltdltc's Avatar
    ltdltc is offline Cadillac Owners Fanatic
    Automobile(s): 2010 CTS4 Performance Sport Wagon
    Join Date
    Jun 2003
    Location
    MA
    Age
    35
    Posts
    491

    Re: Who else has had random Misfire issues? 2006 DTS

    Changing those rear plugs sucks a big one. If your having misfire issues best to diagnose which coil is not working correctly.


Bookmarks

Cadillac Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Read about Lincoln | Buick | Kia Forte Forum