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Cadillac engine repair questions and answers

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  • sunshineannie37
    sunshineannie37 - 1991 Cadillac DeVille - Engine - 7/15/2013
    Why does my car lose all engine power when pushing the gas pedal after driving for 45 min or more?
    I've had 4 injectors replaces on my car and it didn't act like this. I was told that it could be a coolant sensor because it does it after I've been driving for a while. I was told the cam shaft sensor was replaced 3 yrs. ago but was told today, my car doesn't have ...
     
    • Jimm
      7/15/2013 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.
      For the pre-1995 models the OBD I system was used. The code reader is different for this older system - however most part stores will still have the capability to read and retrieve any stored codes.

      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

      OBD1 Codes Retrieval (Pre-1995 Cars and Trucks)
      GM 1983-95 vehicles OBD1 codes self-retrieval

      As the name implies, you can get the codes for GM cars or trucks yourself if the model of your vehicle is made before 1995, this means as soon as you see “check engine light” in your dash, you can get the code in minutes if you want.

      The connector where you get the GM OBD1 code is usually located under the instrument panel, or under the hood - near the fuse box / power distribution panel.

      When you find the adapter connector, use a jumper wire (see red wire above) and connect terminals A and B. Next turn your key on but don't start. Watch your check engine flash the code/s.

      EXAMPLE: CODE 12: one long flash and two short flashesCODE 13: one long flash and 3 short flashes.

      Note: code 12 is usually the first code you get and just ignore it.Watch the code after code 12, that's what you need.

      GM common codes for OBD1 (for vehicles made before 1995)
      12 System normal
      13 oxygen sensor circuit open
      14 coolant sensor high resistance or shorted
      15 coolant sensor circuit low or open
      16 direct ignition system (DIS) fault in circuit
      17 cam position sensor fault
      18 crank or cam sensor error
      19 crank sensor circuit fault
      21 tps sensor out of range
      22 tps sensor signal voltage low
      23 intake air temp sensor out of range, low
      24 vehicle speed (vss) sensor circuit fault
      25 air temp sensor sensor out of range, high
      26 quad-driver module (computer) circuit #1 fault
      27 quad-driver module (computer) 2nd gear circuit
      28 quad-driver module (computer) circuit #2 fault
      29 quad driver module (computer) 4th gear circuit
      31 cam position sensor fault
      32 egr circuit fault
      33 map sensor signal out of range, high
      34 map sensor signal out of range, low
      35 idle air control sensor circuit fault
      36 ignition system circuit error
      38 brake input circuit fault
      39 clutch input circuit fault
      41 cam sensor circuit fault, igntion control circuit fault
      42 electronic spark timing (EST) circuit grounded
      43 knock sensor
      or electronic spark control circuit fault
      44 oxygen sensor lean exhaust
      45 oxygen sensor rich exhaust
      46 pass-key II circuit or ps.pressure switch circuit fault
      47 pcm-bcm data circuit
      48 misfire diagnosis
      51 calibration error, mem-cal, ecm or eeprom failure
      52 engine oil temperature circuit, low temperature indicated
      53 battery voltage error or egr or pass-key II circuit
      54 egr system failure or fuel pump circuit low voltage
      55 a/d converter error or pcm not grounded or lean fuel or frounded reference voltage
      56 quad-driver module #2 circuit
      57 boost control problem
      58 vehicle anti-theft system fuel enable circuit
      61 a/c system performance or degraded oxygen sensor signal
      62 engine oil temperature high temperature indicated
      63 oxygen sensor right side circuit open or map sensor out of range
      64 oxygen sensor right side lean exhaust indicated
      65 oxygen sensor right side rich exhaust indicated
      66 a/c pressure sensor circuit low pressure
      67 a/c pressure sensor circuit or a/c clutch circuit failure
      68 a/c compressor relay circuit failure
      69 a/c clutch circuit head pressure high
      70 a/c refrigerant pressure circuit high
      71 a/c evaporator temperature sensor circuit low
      72 gear selector switch circuit
      73 a/c evaporator temperature circuit high
      75 digital egr #1 solenoid error
      76 digital egr #2 solenoid error
      77 digital egr #3 solenoid error
      79 vehicle speed sensor (vss) circuit signal high
      80 vehicle speed sensor (vss) circuit signal low
      81 brake input circuit fault
      82 ignition control (IC) 3X signal error
      85 prom error
      86 analog/dig
  • elainee2000
    elainee2000 - 2007 Cadillac DTS - Engine - 7/13/2013
    Knocking sound when running
    Engine makes a knocking sound when running
     
    • wbrockstar
      7/13/2013 wbrockstar
      Has the noise just recently started.Does the oil pressure get really low when at a stop at idle?If so the knock is usually comin from the main/rod bearings having excessive clearance from miles/age of vehicle.It could also be coming from a wrist pin or piston slap between cylinder wall and piston.How many miles
  • markerman
    markerman - 1997 Cadillac Eldorado - Engine - 7/9/2013
    Oil light blinks when ideling oil level fine.
     
    • Jimm
      7/8/2013 Jimm
      Several possibilities; faulty oil pressure switch (located near the engine oil filter), faulty / corroded wiring or connection at the pressure switch, faulty oil light (loose connection).
      Check the many on-line auto parts sources, such as; www.partstrain.com, www.partsgeek.com, www.carpartswarehouse.com, or www.rockauto.com for the replacement parts.
      For example, they (RockAuto) list the oil pressure switch from around $7.60 for your vehicle. Before replacing any parts - first check the switch and wiring conditions.
      Jimm
      7/9/2013 markerman
      thanf you
    • John's Auto Repair
      If pressure switch doesn't fix problem you may have low oil pressure. The oil light comes on when
      oil pressure drops below 5 PSI. Check oil pressure with a positive gauge ( mechanical gauge ).
  • markerman
    markerman - 1997 Cadillac Eldorado - Engine - 7/9/2013
    Oil light blinks while ideling oil on stick at max.
     
    • Jimm
      7/8/2013 Jimm
      Several possibilities; faulty oil pressure switch (located near the engine oil filter), faulty / corroded wiring or connection at the pressure switch, faulty oil light (loose connection).
      Check the many on-line auto parts sources, such as; www.partstrain.com, www.partsgeek.com, www.carpartswarehouse.com, or www.rockauto.com for the replacement parts.
      For example, they (RockAuto) list the oil pressure switch from around $7.60 for your vehicle. Before replacing any parts - first check the switch and wiring conditions.
      Jimm
      7/9/2013 markerman
      Thank you so much I am due for an oil change
    • Bill
      7/8/2013 Bill
      If this is dirty oil change, then if problem persists do as Jimm has recommended.
      Bill
      7/9/2013 markerman
      thank you for your time
    • John's Auto Repair
      The other possibility is low oil pressure. the oil light comes on when there is less than 5 PSI of
      oil pressure. If pressure switch doesn't fix it then have the pressure checked with a positive
      gauge ( mechanical gauge ).
  • clark.terrill
    clark.terrill - 2000 Cadillac DeVille - Engine - 7/6/2013
    Fix hole/leak in "radiator surge outlet pipe" Between fill container and engine. Rear top of eng.
    A hole has rusted thru this metal pipe. From the radiator fill container to the engine it is a hose, this pipe and another hose. How to fix/ replace this tube?
     
    • Jimm
      7/6/2013 Jimm
      The radiator outlet pipe must be replaced if there is a hole / leaking. Try this part source - cost is around $17.00. www.gmpartsgiant.com The GM part number is: 25672302
      Jimm
      7/6/2013 clark.terrill
      The web site states the part is not available. However, with the part number I should be able to better search.
      Thank you.
  • dgorbea
    dgorbea - 1998 Cadillac DeVille - Engine - 6/25/2013
    What is the optimal operating temperature of the engine
     
    • Jimm
      6/25/2013 Jimm
      The optimal operating temperatures will vary in and around the engine. For example, the combustion chamber (where the air / fuel mixture ignites) temperature is around 4,500 F (2,500 C) for optimal fuel mixture burning.

      I think you may be referring to the cooling system temperature - such as the thermaostat temperature rating. The thermostat for the 4.6L engine operates (temperature rating) at 180 F.
  • dgorbea
    dgorbea - 1998 Cadillac DeVille - Engine - 6/24/2013
    What is the normal operating temperature of the engine
     
    • CVO
      6/24/2013 CVO
      Engine cooling temperature is running from 220- 238 degrees.
  • sonnieymoney
    sonnieymoney - 1991 Cadillac DeVille - Engine - 6/23/2013
    My car has no power when i step on the gas,
    the car has 96,000 org miles,the car hesitate when applying the gas peddle then it picks up but will not exceed 50to55mph,I;ve replaced sparkplus,an wires,timming chain angears,distribertercap,roter,moduel transmissinomoduel fuel pump,waterpump an it stilllacks ...
     
    • Jimm
      6/23/2013 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
      Jimm
      6/23/2013 CVO
      See this site on GM 1983-95 vehicles OBD1 codes self-retrieval.
      http://www.extreme-check-engine-light-codes.com...
  • sonnieymoney
    sonnieymoney - 1991 Cadillac DeVille - Engine - 6/23/2013
    My lacks power,hesitate wheni step on the gas
    the car has 96,000 origanal miles,I've changed the spark plugsan wires,distribertercap,coil,roter,anmoduel,replaced timmingchain angears,fuelpump,waterpump transmission moduel,..the car wont excelrate past 55mph,unless itsgoing down hill when on an incline it roll ...
     
    • Jimm
      6/23/2013 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
  • sonnieymoney
    sonnieymoney - 1991 Cadillac DeVille - Engine - 6/23/2013
    My lacks power,hesitate wheni step on the gas
    the car has 96,000 origanal miles,I've changed the spark plugsan wires,distribertercap,coil,roter,anmoduel,replaced timmingchain angears,fuelpump,waterpump transmission moduel,..the car wont excelrate past 55mph,unless itsgoing down hill when on an incline it roll ...
     
    • Jimm
      6/23/2013 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
  • Steve
    Steve - 1996 Cadillac Eldorado - Engine - 6/23/2013
    When I accelerate my car hard, the check engine light comes on and I get message "emission system needs work" .
    The car also runs rough and hesitates. When I stop the car for awhile and then restart it, the problems are gone and the check engine light and messages are gone.
     
    • Jimm
      6/23/2013 Jimm
      First step - have the check engine light or stored fault codes 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.
  • biskit5.0
    biskit5.0 - 1997 Cadillac Eldorado - Engine - 6/23/2013
    Has northstar engine burns up alternators goes from low voltage to high voltage then no charge
    battery fully charged and is good
     
    • Jimm
      6/23/2013 Jimm
      What brand or type of alternators are being installed? What is the voltage and condition of the alternator output at the time of the failure? Has the charging system been tested (for free) after the installation? Is the alternator drive belt tension correct?
      Be sure to purchase a new - not remanufactured - alternator; AC Delco or Remy brand. Check the many on-line auto parts sources, such as; www.partsgeek.com, www.carpartswarehouse.com, or www.rockauto.com for the replacement parts. For example, they (RockAuto) list the new alternator from around $113.00 for your vehicle.
      Jimm
      6/23/2013 John's Auto Repair
      I agree with Jimms stay away from rebuilts
  • willibri3
    willibri3 - 1998 Cadillac DeVille - Engine - 6/21/2013
    Oil dash light symbol flickers on when water temp. reaches 217 or higher
    When gear shift lever is put into N and /or accelerator is pushed very lightlyand RPM's increase, light goes out all while sitting in heavy traffic and outside temp is very high and water temp very high.I am told computer cannot be adjusted to increase idle slightly ...
     
    • John's Auto Repair
      6/21/2013 John's Auto Repair
      Your oil pressure is dropping below 5 PSI. does car have high mileage? Check with a positive
      pressure gauge to verify. ( mechanical pressure gauge)
  • la.rinehart
    la.rinehart - 1999 Cadillac Eldorado - Engine - 6/17/2013
    Start disabled displays when trying to start. Manual says check condition of the key. I have two keys, neither work.
    Would cleaning ignition switch help?
     
    0 answer
  • wabhou2
    wabhou2 - 1991 Cadillac Seville - Engine - 6/15/2013
    Have 1991 deceased Fathers TOWNCAR...not Sevile...but its not listed in choice.
    Orginal 72K miles...has had 4 factory starters & solenid/starter last replaced < 6 months ago. Won't always engage...can sometimes use sm. prybar to turn flywhell or let cool down say 30 min's & it may statrt. Next I figure is engine wiring harness replacement...ANY ...
     
    • Jimm
      6/15/2013 Jimm
      To check the starter gear and flywheel / flexplate teeth alignment and contact pattern - apply some machinist blueing to the starter teeth and the the flywheel / flexplate teeth. Then, attempt to start the engine several times.
      Observe the contact pattern left by the starter engagement - the pattern should be squarely in the middle of the tooth. If off somewhat (not centered) then you can either adjust / shim the starter in the correct direction, or replace the starter. If the flywheel / flexplate teeth are worn - then the problem is not with the starter motor.
      The flexplate / flywheel must be replaced instead. Check the many on-line auto parts sources, such as; www.autopartswarehouse, www.carpartswarehouse.com, or www.rockauto.com for the replacement parts.