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Cadillac engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 2004 Cadillac CTS - Engine - 5/28/2014
    Why does my Cadi engine shut off randomly during commute??
    Steeringwheel + brakes lock after car shuts off randomly during drive with no control steering.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1987 Cadillac DeVille - Engine - 5/3/2014
    Engine stopped and won't start again.
    Hey guys, having a problem with my 87 Cadillac Deville and would love some help. I was driving on the freeway with no issues or warning lights of any kind when my car suddenly and without warning shut off. When this happened, a "Service Electrical System Soon" and ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1987 Cadillac DeVille - Engine - 5/3/2014
    Engine stopped and won't start again.
    Hey guys, having a problem with my 87 Cadillac Deville and would love some help. I was driving on the freeway with no issues or warning lights of any kind when my car suddenly and without warning shut off. When this happened, a "Service Electrical System Soon" and ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2007 Cadillac CTS - Engine - 5/2/2014
    Rpm surges while crusing
    Hello, I have a new to me 07 cts. The car drives and shifts fine, but I have noticed while crusing the rpms fluctate about 100-200 rpm. Even in cruise control I can see the flucuations. I was worried it was my transmission, but I can put the car in neutral, hold it ...
     
    • Jimm
      5/2/2014 Jimm
      There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      First step - have any stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA, etc. Then, post a reply as 'add answer' with the specific code for more assistance.
      There are literally hundreds of possible fault codes and therefore numerous reasons for the fault code condition.
      This step is important - retrieving any stored fault code and relaying this detail - will provide good information to assist in diagnosing and repairing the issue you are having.

      Typically, the engine RPMs fluctuation would be caused by one or more of these possibilities; clogged fuel filter (replace the filter if over 24k miles since last service), vacuum leak at the engine, or maybe this GM TSB (technical service bulletin) regarding the TCM (transmission Control Module) may explain - the condition is known as shudder / chuggle;

      Note the abbreviation TCC = torque converter control (transmission uses the torque converter as hydraulic flywheel between the engine and transmission to transmit engine torque to drive the trans and drive wheels).

      Contact the local dealership for explanation of the specific TSBs, or your local trusted / reputable repair shop for the same information.

      Code: 06-07-30-020 TSB LP1/LY7 Intermittent Engine Chuggle at Highway Speeds During Light Throttle Load (Reprogram Transmission Control Module (TCM))

      PIP3456D PI TCC Drone Surge Shudder Or Chuggle - keywords 5L40E 5L50E automatic calibration converter engage torque

      PIP3456C PI TCC Drone Surge Shudder Or Chuggle - keywords 5L40E 5L50E automatic engage

      PIP3658B PI TCC Surge, Chuggle, or Fishbite 5L40E with V6 Engine - keywords miss shudder surge

      PIP3658A PI TCC Surge, Chuggle or Fishbite - keywords 3.6 5L40E LY7 miss shudder

      PIP3456B PI TCC Surge Shudder or Chuggle February 14, 2006

      PIP3658 PI TCC Surge, Chuggle, or Fishbite 5L40E with V6 Engine - keywords 3.6L LY7 miss shudder

      PIP3144A PI P0101 P0106 P0121 Poor Acceleration and Detonation in Gear - keywords chuggle converter drive forward fuel hesitate idle information launch load low misfire miss performance power reverse stall surge

      PIP3456A PI TCC Surge, Shudder or Chuggle - keywords 5L40E 5L50E automatic engage transmission

      PIP3456 PI TCC Surge, Shudder or Chuggle - keywords 5L40E 5L50E automatic engage transmission
  • AutoMD Member
    AutoMD Member - 2007 Cadillac CTS - Engine - 5/2/2014
    Rpm surges while crusing
    Hello, I have a new to me 07 cts. The car drives and shifts fine, but I have noticed while crusing the rpms fluctate about 100-200 rpm. Even in cruise control I can see the flucuations. I was worried it was my transmission, but I can put the car in neutral, hold it ...
     
    0 answer
  • Grambo
    Grambo - 2000 Cadillac DeVille - Engine - 4/24/2014
    I need to know what a "coil boot" is so I can determine if my estimated cost from the auto-shop is valid.
    I am a WIDOW and know nothing about cars. I just found this website and I tried to input info about the repair estimate given to me by the auto-shop but "coil boot" means nothing to me. My Cadillac has 114,000 miles on it and it's always been serviced regularly. ...
     
    • John's Auto Repair
      4/24/2014 John's Auto Repair
      This guy sounds a bit pricey, especially the parts costs. I would get a second opinion!
  • Grambo
    Grambo - 2000 Cadillac DeVille - Engine - 4/24/2014
    My question is "what is a coil boot"??? The reason I need to know this is to determine if the repair estimate is valid.
    My car has 114,000 miles on it but it's always been serviced. My check engine light went on and says "Service engine soon". I have an estimate of $288 for spark plugs, coil boots and, of course, labor. This shop recently charged me $773 to remove & replace coolant ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2000 Cadillac DeVille - Engine - 4/12/2014
    I just bought a 2000 deville..the person i bought it from told me he was driving and the dash lights went heywire on it.
    the car has 170000 when i turn the key to start i get a black dash..car won't do anything. i have over 12 v everywhere. i have checked all the fuses and they all seem to be fine. there is no engine light on. it just has me stumped. i'm not a full fledged mechanic. ...
     
    • alex
      4/12/2014 alex
      check the ground. when i check them i leave it plugged in i poke t pins into the back of the connector. with digital things just a weak connection will make them not work. but with out the load of the component a voltmeter will still read 12 and your ground will ohm out fine but pluged in put your voltmeter on ground wire and ground with the other lead it should be very close to zero if there is more than a half a volt its a bad ground. more than likely its the gauge cluster but i like to prove it before i order parts. if you want to understand better why it needs to be plugged in to test power and ground google differance between potential and available voltage. also with computer controlled components test lights are horable for them they can fry circuits in controllers.
  • AutoMD Member
    AutoMD Member - 2002 Cadillac Seville - Engine - 4/12/2014
    My engine can't rev over 3000 rpm
    I replaced the air filter,MAP sensor,fuel pump and filter,throttle position sensor. It has black and blue smoke coming out of the tail pipe.
     
    • HouseCallAuto
      4/12/2014 HouseCallAuto
      What fault codes are stored? Checking for codes cannot be skipped. Replace the rubber seal between the throttle body and the intake manifold as they are almost all defective after 5 years.
  • AutoMD Member
    AutoMD Member - 2003 Cadillac Seville - Engine - 4/3/2014
    Coolant leaking due to warn gaskets. Please estimate the cost of repair
    It leaks only when cool [at night], intermitently, 3 times in the last 3-4 years. Oberflow tank and sseveral hoses were replaced. The above diagnosis was made yesterday, after the car stayed in the shop overnight. Because of extensive work and cost I'd rather ...
     
    0 answer
  • frank
    frank - 2004 Cadillac DeVille - Engine - 3/18/2014
    Idle goes up to 1500rpm after car warms up
    my car idles at about 650rpm when its running normal. But after i drive it for 20-30min the idle will raise to 1200-1500rpm. the MIL comes on and ses TPS but i replaced the TPS and i shook the wires while watching it on scanner and it doesnt change so i know wiring ...
     
    • HouseCallAuto
      3/17/2014 HouseCallAuto
      You did not make clear what fault codes are still returning. Tell me the code numbers. if there are no codes stored tell me that. If you still are getting a TPS code then this is your cause for the idle speed problem. That means circuit checking the TPS wires back to the PCM. The idle speed control has been known to go bad with no codes showing.
      HouseCallAuto
      3/17/2014 frank
      I ANSWERD YOU BELOW AS in another answer cause i know if i reply to you ..you wont be able to answer me again
    • frank
      3/17/2014 frank
      yes the TPS code keeps returning, even after a wiggle test, and a new TPS.
    • frank
      3/17/2014 frank
      it was a TPS circuit high code..i forget the exact trouble code number
    • HouseCallAuto
      3/17/2014 HouseCallAuto
      I require a code number as there are several different TPS fault codes and I do not want to have to consider all of them in my answer.
      HouseCallAuto
      3/18/2014 frank
      P0121
    • frank
      3/18/2014 frank
      the code is P0121
    • Jimm
      3/18/2014 Jimm
      P0121 means Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem. P0121 occurs when the PCM has detected a throttle angle that is significantly higher or lower for the specified engine RPM (revolution per minute).

      Possible Causes:

      Open or short in the TPS wiring or circuit
      Loose or contaminated TPS connector
      Defective PCM

      Possible Solutions:

      Repair or replace TPS wiring or circuit
      Tighten or replace TPS connector
      Replace PCM
  • Spencer
    Spencer - 2000 Cadillac Escalade - Engine - 3/17/2014
    My truck struggles to stay on and does not go pass 2000rpm
    Truck turns on the engine shakes struggles to stay on doesn't go pass 2000 rpm cant drive it just creeps slowly
     
    • HouseCallAuto
      3/17/2014 HouseCallAuto
      Plug in a code reader and read what fault codes are there. Write them down. Update the post with code numbers. Then erase all the codes and see if erasing the codes restores driveability temporarily.
  • AutoMD Member
    AutoMD Member - 2005 Cadillac CTS - Engine - 3/14/2014
    Install engine, won't crank
    computer
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2005 Cadillac CTS - Engine - 3/14/2014
    install engine, engine won't crank. Temperature gauge and fuel gauge won't work
    Won't crank, temperature gauge and fuel gauge won't work. The engine computer that came with the engine is what I have worked on.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1994 Cadillac Fleetwood - Engine - 3/14/2014
    All signs lead to a bad alternator but my alternator tested good. what else could it be?
    I have a digital dashboard that flickers and turns on and off while driving,my lights are very dim and flickers as well. I have a digital screen radio that turn on and off as well while driving. the PASS KEY FAULT light keeps coming on,air and heat goes in and out ...
     
    • HouseCallAuto
      3/14/2014 HouseCallAuto
      I would check the battery terminals for corrosion being present under the vinyl covers. In order to see this you have to remove the 5/16 battery tyerminal bolt completely from the terminal and slip off the vinyl covers and then you can see the cable and the crimp and the condition of the lug. Wire brush etc..and also clean the lead on the battery.