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Cadillac engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 2002 Cadillac DeVille - Engine - 12/15/2013
    After 15-20 minutes of driving the idling becomes rough
    it has 130000 miles, I have replaced thermostat, plugs, plug boots, mass air flow sensor and throttle sensor
    • Jimm
      12/15/2013 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
    • HouseCallAuto
      12/15/2013 HouseCallAuto

      1. Check for vacuum leak at the boot between the throttle body and the upper intake manifold plenum.

      2. Spray a mist of water on the upper intake manifold, check for RPM response. If there is a change in running quality replace the boot. very common.
  • AutoMD Member
    AutoMD Member - 2002 Cadillac DeVille - Engine - 12/15/2013
    After about 15-20 of driving the idling becomes rough
    car has almost 130,000 miles, I have replaced thermostat, plugs, plug boots, mass air flow sensor and throttle position sensor. only happens after car warmed up
    0 answer
  • AutoMD Member
    AutoMD Member - 2005 Cadillac CTS - Engine - 12/14/2013
    Key stuck in ignition
    went to start car, lights came on but nothing happened. Now key is stuck in ignition and some dash lights are still on
    • HouseCallAuto
      12/14/2013 HouseCallAuto
      There is a very high probability of the cause of this being a bad Powertrain Control Module (PCM). The only thing you could do that would likely confirm this is by plugging in a code reader to the diagnostic connector under the dash. If your code reader is UNABLE to establish communication with the PCM then that pretty much says the PCM had a stroke. The key being stuck and no comminication = bad PCM.
  • AutoMD Member
    AutoMD Member - 1998 Cadillac DeVille - Engine - 12/12/2013
    How do u install a heater core on a 1998 cadillac deville
    help me
    0 answer
  • Evelio
    Evelio - 1996 Cadillac DeVille - Engine - 12/9/2013
    • HouseCallAuto
      12/9/2013 HouseCallAuto
      You have a faulty ignition lock cylinder. You could try to bypass it. Look up "Pass-key II bypass" on Google.
  • greg
    greg - 2003 Cadillac DeVille - Engine - 12/9/2013
    Why does my stop running while ideling or warming up
    i start the car it runes for a bit then it shuts back off
    • Sammy
      12/9/2013 Sammy
      poss causes week fuel pump restricted exhaust engine cant breath egr valve sticking or iac motor week alternater voltage good luck
      12/10/2013 greg
      thanks sammy the autozone oem brand code gm p0741 difinition tcc stuck off
  • AutoMD Member
    AutoMD Member - 2005 Cadillac SRX - Engine - 12/4/2013
    • HouseCallAuto
      12/4/2013 HouseCallAuto
      An engine light being on does not mean that your computer needs to be replaced. It means that there are fault codes stored and there is a problem with some sensor data being received (or not received). There is not a way to estimate what your bill will be until someone diagnoses this.
  • AutoMD Member
    AutoMD Member - 2005 Cadillac SRX - Engine - 12/4/2013
    • HouseCallAuto
      12/4/2013 HouseCallAuto
      It depends on if a new computer from dealer, or remanufactured or even a used one. could be as much as $600 or as cheap as $150, this is parts cost and does not include diagnostic labor or installation labor
  • AutoMD Member
    AutoMD Member - 2001 Cadillac DeVille - Engine - 12/1/2013
    My friend changes his thermostat is a 2001 Cadillac Deville, since then it is acting like it has an air block.
    After changing the thermostat, the ngine acts like it has an air block in the cooling system. How do I get the air block out of this model car?
    • HouseCallAuto
      12/1/2013 HouseCallAuto
      There is no special bleed procedure for this vehicle. What were the symptoms that it was decided to replace the thermostat? The engine must have been running hot or even overheating before, or you would not have replaced the stat, right? My gut feeling says bad head gaskets of which they are well known for.
  • AutoMD Member
    AutoMD Member - 1999 Cadillac Escalade - Engine - 11/21/2013
    Will start for just a monet but will not run
    will set a few days and run fine
    0 answer
  • AutoMD Member
    AutoMD Member - 1985 Cadillac Seville - Engine - 11/17/2013
    Not receiving fuel at carb
    Had the fuel pump changed which was located in tank. Changed fuel filter behind Lt side rear tire prior to pump and didnt fix problem. So proceeded to change pump. Cannot locate an inline filter if there is a second?? near carb. Seems there should be. Drove the ...
    • HouseCallAuto
      11/17/2013 HouseCallAuto
      Please clarify something. If you take a line off the fuel filter and turn the key to crank, you are saying that there is NO fuel flow there? Yes / No clear answer please. This "carb" you refer to is not a carburetor, it is a Throttle Body and the system is known as TBI or throttle body injection, just sayin.
  • AutoMD Member
    AutoMD Member - 2001 Cadillac DeVille - Engine - 11/17/2013
    New air pump in but code po 410
    also po 420 but did put in new pump but engine ligt on
    • HouseCallAuto
      11/17/2013 HouseCallAuto
      Test AIR PUMP A fuse. The P0420 means the cat is junk about 90% of the time. About 10% of the time the rear O2 sensor is junk.
  • dizane 70
    dizane 70 - 1997 Cadillac DeVille - Engine - 11/14/2013
    No injector pulse crank but no start
    no codes i changed the computer the camshaft sensor crankshaft sensors and the coil plate plugs and wires the niod light blinks once
    • HouseCallAuto
      11/14/2013 HouseCallAuto
      Do you have a security light illuminated on the panel? If so you likely have a faulty ignition lock cylinder or a faulty ignition key. the key has a resistor embedded in it that the ignition lock cylinder and security module read the value of and this is like a password that enables fuel.
  • AutoMD Member
    AutoMD Member - 1991 Cadillac DeVille - Engine - 11/12/2013
    Estimated repair cost to replace cam shaft.
    Two month ago we replaced all 16 Roller Hydraulic Lifter with a new set and everything was fine. Then I removed intake manifold because of strange noise had just started .... to discover one of the new RHL failed on lower end a piece is missing. The missing piece ...
    • Jimm
      11/12/2013 Jimm
      Use both the 'Estimate Cost' and 'Find-A-Shop' features on the AutoMD website to locate a local repair shop in your area and to receive quotes for this work as described.
  • AutoMD Member
    AutoMD Member - 1995 Cadillac DeVille - Engine - 11/11/2013
    Why does my fan for heater & air not work?
    put new blower motor in about 2 years ago. now it won't blow at all again.alredy checked fuses. it has power to it, but it does nt blow at all
    • HouseCallAuto
      11/11/2013 HouseCallAuto
      The blower motor runs by receiving battery voltage and a ground. You just stated that there is battery voltage at the blower motor. Now check and confirm that there is a ground. It should run and if it does not then the motor is junk. Try smacking it with something while power is applied to it. It may begin to run.