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Cadillac engine repair questions and answers

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  • 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.
      3/17/2014 frank
      I ANSWERD YOU BELOW AS in another answer cause i know if i reply to 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.
      3/18/2014 frank
    • 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
    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.
  • greg
    greg - 2003 Cadillac DeVille - Engine - 3/11/2014
    What is egr valve for
    my car keep trying to choke out wile in idel
    • Jimm
      3/11/2014 Jimm
      The EGR (exhaust gas recirculation) valve simply reroutes some of the exhaust gases into the intake (engine inlet) to help the engine burn more completely and reduce emissions.

      Why do you ask - is there an issue in regard to the EGR valve?
      3/11/2014 greg
      i was told that it could be
    • Jimm
      3/11/2014 Jimm
      Try cleaning the EGR valve as a first step - less expense than replacing it. Use a quality carburetor / fuel system aerosol spray to thoroughly clean the EGR valve - inside and out.
  • AutoMD Member
    AutoMD Member - 1997 Cadillac Seville - Engine - 3/10/2014
    Why would your oil pressure warning lights come on
    Oil is up and not needed, checked dip stick....stop engine warning...did not over heat
    • HouseCallAuto
      3/10/2014 HouseCallAuto
      Hard to advise because if there is no oil pressure then you do not have a lot of time to spend listening to it for a diagnosis. That being said this needs a pro to look at it so there is the least amount of time that the engine will run during diagnosis. An engine that has zero oil pressure will become severely damaged in just a few minutes of running so the strategy that will be used by a pro would be to hook up a manual gauge to read actual oil pressure the moment it is running and if there is oil pressure then the engine can be allowed to continue to run to determine the cause of the stop engine warning. Might be a bad sending unit but right now you do not know that.
  • lewis
    lewis - 1994 Cadillac Fleetwood - Engine - 3/10/2014
    I have a 1987 Mercedes 190E has a new alternator but battery goes dead quickly. Any recommendations?
    Battery is good.
    • Jimm
      3/10/2014 Jimm
      Sounds like a weak battery, or short in the electrical system - but before replacing the battery, remove it and take to the nearest auto parts store to have the battery fully recharged and tested for free.

      There may be other issues; alternator, serpentine drive belt worn or belt tensioner worn - in addition to the parasitic current draw. Check to make sure all switches / lights / interior door lights / courtesy lights are off.

      To test for the parasitic electrical draw - remove the various fuses - one at a time - and with a volt / ohm meter connected across the battery terminals - observe whether the respective circuit has any voltage drop with the fuse removed and replaced. If the fuse removal and replacement affects the voltage / current drop - then look at the components in that particular circuit.

      Once the battery is fully charged and reinstalled - take the vehicle to the nearest auto parts store for a complete charging system test - for free - to test the condition of the; alternator, battery, belt, wiring, starter, etc. Post a reply with the results for further assistance.
  • AutoMD Member
    AutoMD Member - 2004 Cadillac DeVille - Engine - 3/7/2014
    Car starts and drives great in the morning, by the end of the day wont start at all, instrument panel lights up
    Car want start unless I let it sit for awhile, plus door locks and unlocks by itself, radio turns on and off,gas hand drop to the E position, happens off and on, when I drive for a good minute sometimes all the service lights will pop on, the car only has 60,000 ...
    0 answer
  • frank
    frank - 2004 Cadillac DeVille - Engine - 3/1/2014
    Fluctuating idle and rpm
    my car's idle goes from 6oorpm to 900 rpm when i put it in gear, and sometimes it will hold 40mph and slowly climb with my foot of the gas pedal. does this sound like a vacuum leak? and sometimes it idles and runs fine..its very strange symptoms..any suggestions?
    • Jimm
      3/1/2014 Jimm
      Several possibilities; vacuum hose / tube leaking, faulty IAC (idle air control) valve. As a first step - inspect / trace all the vacuum hoses - replace any which are damaged or cracked.

      The parts are readily available from these many on-line sources,,,,, - to list only a few possibilities.
      In fact, they (RockAuto) list the IAC from around $167.00 for your vehicle.

      If you need directions / instructions for the replacement, use these websites;, or and the 'How-To-Guides' feature.
  • Perry
    Perry - 1998 Cadillac DeVille - Engine - 2/27/2014
    P0741 code is active. how can i repair if possible
    the car runs fine
    • Jimm
      2/27/2014 Jimm
      P0741 - Torque Converter Circuit Performance or Stuck

      The torque converter clutch (TCC) solenoid is faulty or stuck off. Look for a wiring problem or if you have access to one - a scan tool that will actuate the TCC for you.
  • Draginj23
    Draginj23 - 2006 Cadillac CTS - Engine - 2/25/2014
    Can someone help with codes and what to do ?
    The other day started car and this is when all this happened .. i noticed my check engine light came on after a rough start to the car. While driving wife to work the engine light started to flash and noticed i lost some power and rpm gauge was going up and down . I ...
    • Jimm
      2/25/2014 Jimm
      The fault codes; P0301 = Cylinder # 1 misfire

      It may mean that one or more of the following has happened:

      Faulty spark plug or wire
      Faulty coil (pack)
      Faulty oxygen sensor(s)
      Faulty fuel injector
      Burned exhaust valve
      Faulty catalytic converter(s)
      Running out of fuel
      Poor compression
      Defective computer

      Possible Solutions

      If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

      If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

      P0201 = Injector Circuit Malfunction - Cylinder 1. This trouble code indicates that the PCM senses that there is a problem in cylinder #1 fuel injector circuit.

      Here are the possible causes of P0201

      o Dirty or clogged fuel injector
      o Defective fuel injector
      o Short or open in the fuel injector circuit
      o Defective PCM

      Possible solutions:

      o Repair or replace the wires/connection in the fuel injector circuit
      o Clean or replace fuel injector
      o Replace and reprogram the PCM
  • greg
    greg - 2003 Cadillac DeVille - Engine - 2/25/2014
    How much does it cost to fix a egr vale
    my car keeps cutting off when i warm it up .i got po404 coad
    • Jimm
      2/25/2014 Jimm
      The parts are readily available from these many on-line sources,,,,, - to list only a few possibilities.
      In fact, they (RockAuto) list the EGR valve from around $96.00 for your vehicle.

      You may chose to install the EGR valve yourself; - for the directions. Recognize the part cost at $96.00 does not include any labor.
  • Steve
    Steve - 1996 Cadillac Eldorado - Engine - 2/25/2014
    The check engine light comes on when I accelerate the car hard or go up a hill. I get message that the emission system
    needs work and the car will begin to run rough. If I stop the car for ten minutes and restart the car, all the problems go away and the check engine light goes off the next day. Diagnosis of the check engine light revealed codes P1406, P0101, P1108.
    • Jimm
      2/25/2014 Jimm
      P1406 - indicates an EGR problem. Clean the EGR valve to remove dirt and carbon.

      P0101 - indicate an issue with the mass air flow sensor (MAF) - such as dirty or an air leak. Same recommendation - clean the MAF first.

      P1108 - BARO to MAP Sensor Comparison Too High

      In each case - use a mass air flow (MAF) spray cleaner to clean the mass air flow sensor. The EGR valve can be cleaned using carburetor / fuel system spray cleaner.