Auto Answers » Engine » Cadillac » Page 91

Cadillac engine repair questions and answers

Post your Cadillac engine question or share what you know by answering questions

1531 Questions
Sort by:
  • diana
    diana - 1994 Cadillac Seville - Engine - 9/2/2010
    Running hot,service ride control and traction disabled 34008
    • around
      9/2/2010 around
      you better hope its not the old cad head gasket problem
    • around
      9/2/2010 around
      This engine is very very common to developing blown head gaskets in numerous areas of the head gasket without showing the tell tale signs of white smoke from the exhaust.

      What happens is that the combustion chamber pressure builds up within the cooling system and prevents the cooling system from allowing normal coolant flow.

      You need to have the head gaskets tested via putting constant air pressure into each spark plug hole and look for bubbles in the radiator cap opening.

  • Stan
    Stan - 2003 Cadillac DeVille - Engine - 9/2/2010
    Engine idle is uneven
    Uneven idle. Slows and then speeds up
  • William
    William - 1984 Cadillac DeVille - Engine - 9/2/2010
    Service now light is on how to repair?
    • yboy82
      8/18/2010 yboy82
      You should diagnose your vehicle with a scan tool to determine what is the cause of your service light to come on.
    • randy
      9/2/2010 randy
      they can and will read it for you at most auto part stores record in writing the code what it states and then let them reset it , the second time i would move towards fixing the problem
  • john g
    john g - 2004 Cadillac DeVille - Engine - 9/2/2010
    • darkmind
      8/23/2010 darkmind
      Check the condition of your magnetic clutch relay and your thermistor.
    • randy
      9/2/2010 randy
      all ac compressors have safeties in place to shut them off in case of a problem high pressure low pressure and low oil switching . I fthe unit is shutting off then coming back on look to see if its rythmatic doing this in a consistent time if so this is called cycling and there is no need to check all these connectioons and relays . There are numerous things that cause this i listed the three different directions above that will all cause this same action . Unfortunately if it is doing this you will need legitimate service at a ac shop due to changing any parts will require reclaiming and recharging system
  • tara
    tara - 2003 Cadillac CTS - Engine - 9/2/2010
    What causes the oil to mix with the water in the radiator reserve and the car to run hot?
    mileage 12300. Head gasket replaces several months ago. The symptoms': happened when vehicle was hot, happened when I stopped water overflow from the radiator reserve and appears to be missed with oil ( a light brown creamy substance). This is the first time I ...
    • Jason
      8/27/2010 Jason
      It could be a damaged transmission or oil cooler that's integrated into the radiator.
    • randy
      9/2/2010 randy
      You need to check your engine oil , and tranny oil and see if you are low there or have had the reverse effect. The tranny might not have a check stick due to its a sealed 5 speed unit like mine . I s there any chance this is left over from repair done and the flushing of system was insufficient? I f not or oil looks good it could be radiator internally popped . Tranny pressure is way higher then water pressure it will contaminate your rad and entire engine and never reverse water into tranny , but, trans will run empty this is a messy situation . This happened on a truck i have same problem and finally found it when my trans started slipping , If head gasket is the problem you will start seeing some major mess coming out of exhaust steam water all kinds of start momentary steam then go away stuff like that
  • Rick Roedell
    Rick Roedell - 2005 Cadillac CTS - Engine - 9/2/2010
    I was told I have carbon build up in my engine. How does this occur?
    I drive 40K miles per year and fill up 3-4 times per week. Most of my miles are highway miles going 70 mph. The car had the symptoms of not starting and seemed like it wasn't getting any gas. It has been in 3 times over the past 3 months. Towed in every time. The ...
    • randy
      9/2/2010 randy
      yes they are telling you the truth , unfortunately the only fix to these problems over long term is to buy better gas from a premium station and burn atleast and i say atleast 89 the problem for you is the additives you have in your fuel is building up in the engine due to not a efficient burn detonation the true reason your engine is stopping is the injectors are probably clogging up or your plugs are fouling up. I have a fleet of vehicles between my 2 my wife and two daughters and for years in the vehicles that burn 87 about every oil change 3 to 4 thousand miles i do what i call a hot mix . I add a really good fuel system cleaner additive to the tank when its empty usually about 25 % more then they recommend Then i fill it with the highest octane i can find 92 or 93 . What this does is raise the operating temp. of your valve train from its normal temp to something hotter this causes increase expansion off all parts . Whatever carbon or gunk that has survived to this point when burning 87 will break loose and also the fuel system cleaner will in combination clean the tips of injectors as well. I own a cts sport , 70 mph will not help its how hard and fast you get to this speed , if you during this tank of treatment punch this vehicle hard it will through the extra action break stuff loose . Clear its throat so to speak . Try this it will help maybe stop reoccurences also change your plugs to something high performance and run atleast aplatinum tip and gap them about .005 more then what they recommend this will cause a hotter burn this is the problem the hotter your burn the cleaner your burn
  • bob sinclair
    • Robert
      9/2/2010 Robert
      Ignition timeing set to advanced, and maybe low batt.
  • Robert
    Robert - 1983 Cadillac Fleetwood - Engine - 9/2/2010
    Where is the number 1# pin on the cap , after the screw tie down? Or is it after the electrical contacts in revears cl
    It is counter clock wise rotation I believe. Does it contain a number#1 on the cap?
    0 answer
  • cdzeroma
    cdzeroma - 1989 Cadillac Seville - Engine - 9/2/2010
    My engine on my 1989 cadillac seville sts runs very well however it just started to idle rough and sometimes it will sta
    Already checked the rotor cap, plugsand catalic converter and they are fine. When the air conditioner is on it idles sometimes as low as 450 rpm.
    • randy
      9/2/2010 randy
      The age of this vehicle and the symptons point to a vaccuum leak . The rubber hoses on a vehicle that is 11 years old can easily harden and dry rot then start to crack from engine vibrations . The vaccuum hoses you need to check are around the throttle body where main induction is pulled to power other devices . The biggest one will be the one that goes to your pvc valve big hose goin into the top of one of your valve covers while engine is running being sure to stay away from all moving parts listen carefully for a hissing noise also check your air filter to make sure that it is not blocked partial to medium dirt will not be the problem good luck......
  • Debra
    Debra - 2000 Cadillac Escalade - Engine - 9/2/2010
    I need a evp cannister
  • randy
    randy - 1980 Cadillac Seville - Engine - 9/1/2010
    No spark from my 8.2 l cadillac engine
    need a ignition wireing diagram
    • darkmind
      9/1/2010 darkmind
      I can’t find any link for your query online. I suggest you purchase a repair manual for your vehicle to know and see an ignition wiring diagram. You can purchase a repair manual for your vehicle at .

      Just visit this link manual
      to see the available manuals. If you can’t see any manual just enter repair manual at the search for box at the upper left side of the page.
  • Tom Carter
    Tom Carter - 2001 Cadillac Catera - Engine - 9/1/2010
    why is my car loosing coolant?
    millage 114000. Warning light that tells me their is no coolant in the over flow tank. Check it and their is coolant in the overflow tank. No problem with the radiator.
    • Oxides
      9/1/2010 Oxides
      it sounds like the level sensor is shot.
  • lois
    • Voltes V
      9/1/2010 Voltes V
      Change the gasket first, that is the first thing you should check on. And chances are, that is the only reason why that is happening.

      Besides, if you have a busted head then i don't think it will only leak into the 6 and 8th cylinder
  • george
    george - 1997 Cadillac Eldorado - Engine - 8/31/2010
    Removing the alternator
    0 answer
  • Vincent
    Vincent - 1984 Cadillac Seville - Engine - 8/31/2010
    No power to the Fule Injectors?
    The throttle body isn't getting fuel so my car doesn’t start. If I poor gas into the throttle body she’ll turn over and run as long as you poor gas into the TB. I've checked the coal, fuel pump, distributor and none of my fuses are blown. So I’m at a loss.
    • HouseCallAuto
      8/31/2010 HouseCallAuto
      Verify that there is battery voltage going to one side of the fuel injectors with key on engine off. If OK - The cause is likely to be a bad ignition module in the distributor. The module can and does fail in such a way that it will have spark but no injector pulse. Not a sure thing but odds are very high.
      8/31/2010 Vincent
      The ignition module was replaced (it was my first thought), and the distributor cap/body are ok.

      I did a resistance test on both fule injectors, the left one gave a reading of 1.5 & the right one gave 1.7

      On the voltage reading for the wires going to the fule injectors the left side gave a reading of 1.065, the right one only gave .5 - .6 (volt less then the left)
    • Vincent
      8/31/2010 Vincent
      Also I checked the error codes they read 12 & 52. Once I cleared the codes and tried to start the car again only error code 12 came back.
    • HouseCallAuto
      8/31/2010 HouseCallAuto
      I asked about battery voltage to one side of each injector with key on engine off. I have to establish that there is 12 volts there (On the red on one and on the white on the other injector. I know that there is no pulse when cranking otherwise the car would start.. If battery voltage is there then you are looking at a bad ecm. I know you said fuses are good but I have to say it anyway. If the ECS fuse were open you would have this same situation. Each injector has its own fuse, make sure that they are not open. Here is two separate circuit tests if you have a lab scope.

      1. Verify there is an RPM signal on the Purple/White wire from the distributor. This should be a 5 volt square wave signal.

      2. Verify power and ground for the Powertrain Control Module (PCM) and see if on board diagnostics can be used to check sensor data.

      3. Check for shorted fuel injectors. Resistance should be 1.1 to 1.3 ohms at room temperature.

      4. Check fuel quality.

      next >>

      1. Backprobe circuit #430, Purple/White wire at the distributor 4-way connector with a scope.

      2. Engine cranking, expect a 0-5v square wave pulse.

      3. If not OK, replace the ignition module, recheck.

      4. If the signal is OK at the module, check the wire, circuit #430 to the ECM for an open. Verify the Throttle Position Sensor (TPS) is not reading high for a clear flood condition.


      What about the Service Engine Soon lamp? Is it on when the key is turned on? Also, the injectors should read within spec at 68F and should be 1.1 to 1.3 ohms. Your readings don't jive, check them again. resistance that is too high will shut the injector drivers down inside the ECM but usually will not damage the ecm. Try disconnecting both injectors and see if the ECM will flash noid lights installed in place of the injectors.

AutoMD Verified Customer
AutoMD obtained proof this customer interacted with the shop.