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Pontiac engine repair questions and answers

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  • kjrendell
    kjrendell - 1996 Pontiac Grand Prix - Engine - 5 hours ago
    Problems accelerating/ gaining speed at 10-40% throttle.
    I was driving on the highway when all of a sudden my vehicle started to seem like it was slowing down and very slightly shaking my car. This now happens all the time, I usually just notice the shanking in a higher gear at around 2000-2500 rpm. The acceleration ...
     
    0 answer
  • davis909
    davis909 - 2002 Pontiac Grand Prix - Engine - 10/21/2014
    Name This Pulley Problem
    http://i62.tinypic.com/20itj61.jpg Last night my serpentine belt started squealing. Got up today and it had snapped; it'd been a while so I figured the Oklahoma temps had gotten to it. Grabbed a new one and installed it no problems, but when I turned the car on, ...
     
    • GT500Knights
      10/21/2014 GT500Knights
      When your turn your car on, is the air conditioning on? Cannot exactly tell which pulley is seizing, but it's possible your air conditioniler compressor is locked up. It is highly unlikely that any other pulleys (power steering, water pump (if so equipped on drive belt system), idled pulley(s), Or tensioner pulley of locking up. Check for tension on the drive belt. A simple test of this is to pull on the belt between two components (engine off of course) and see how it feels. You should be able to exert 20-30lb of pull pressure on the belt and it should move no more than 1-1.5 in (per 12 in of belt length
  • 111d
    111d - 2008 Pontiac Torrent - Engine - 10/15/2014
    Check Engine Light - Multiple Codes (listed below) - Possible ECM Issue
    2008 Pontiac Torrent Check engine light came on earlier today. Had the codes read on it ant got several codes back. All of which are regrading the ECM system or some part of them. The codes are below. Most of them indicate that the ECM is not programed. What does ...
     
    • Jimm
      10/15/2014 Jimm
      P2610 is engine control module or ECM. The vehicle main computer for both fuel injection and ignition. Remove the large block connector going to the ECM and spray both with contact cleaner.

      P0602 = Control Module Programming Error
      Basically that means that there is an interal fault in the Powertrain Control Module (PCM). A P0602 trouble code means that a serial communication failed inside the computer at least 6 times.

      A code P0602 in most cases means the PCM has gone bad. This is possibly due to a short-circuit inside the PCM. Or, if you disconnect the wires/connector from the PCM while the battery is still connected, that may also cause this code.

      Possible Solutions;

      With a P0602 OBD-II trouble code, the most common fix is to replace and reprogram the PCM. In a few cases the dealer may be able to reflash the PCM and get it working. But more than likely the PCM will need to be replaced and reprogrammed (we recommend you take it to a dealership for this). The good news is it *may* be covered under your emmissions warranty. So even if you're out of bumper-to-bumper warranty or powertrain warranty, check your warranty guide or dealer to see if this is covered.

      Other people have reported that they cleared the code only for it to return again and again. Keep in mind that most shops can replace the PCM but not all can program it.

      P0513 = Incorrect Immobilizer Key
  • michael
    michael - 1987 Pontiac Firebird - Engine - 10/13/2014
    Car died-smoke from int vents, mirrors, truck op, parking lts work. no start, no instrument gauges, no nothing
    battery is good at 100%
     
    • alex
      10/13/2014 alex
      sounds like a big short i would fallow the posative battery cable they like to short on the exhaust about 6 inches from starter but just look for the big burnt spot
  • AutoMD Member
    AutoMD Member - 2004 Pontiac Grand Am - Engine - 10/12/2014
    Car dies at low speeds and stops
    The car will die at either low speeds or at stops. Security light turns on sometimes with the oil light, battery light and check engine light. Sometimes the security light will not show until I try to start it a couple times. The car is then hard to start. Will ...
     
    • jdl
      10/12/2014 jdl
      I'd make sure the battery has a full charge and check the charging system.
      With idle issues, I'd check the idle air system and clean the throttle body. Some idle issues can be caused by a leak of some kind? fuel--egr--vacuum, something like that.

      How long since a tune-up? Any applicable trouble codes. Some of the national brand auto stores will check codes for free.
  • williammichaels
    williammichaels - 1994 Pontiac Grand Am - Engine - 10/11/2014
    What would make it idle rough.
    Was running fine, then just started coughing and sputtering like a misfire but plugs and connecting hardware recently changed...
     
    • Jimm
      10/11/2014 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
  • cathy
    cathy - 2005 Pontiac Vibe - Engine - 10/7/2014
    When throttle is pressed no acceleration, replaced throttle censor and still no acceleration.
    yes check engine light is on code reader shows 2118 we have also checked fuses. Problem started when battery need a charge, charged it and no acceleration.
     
    • Jimm
      10/7/2014 Jimm
      DTC P2118: Throttle Actuator Control Motor Current Range/Performance

      DESCRIPTION
      The throttle valve in the throttle body utilizes a throttle return spring to assist in positioning the throttle valve at a resting or default position. The powertrain control module (PCM) uses driver input from the accelerator pedal position (APP) sensor in order to calculate the desired throttle position. The PCM sends the desired throttle position or target value to the throttle actuator control (TAC) module. The TAC module achieves the desired throttle position by commanding the throttle control motor to position the throttle valve at the target value. The TAC module then compares the throttle position (TP) sensor 1 value to the target value. If necessary, the throttle control motor is moved slightly in order to obtain the exact target value position.

      The PCM is supplied with ignition positive voltage through the ETCS fuse for the operation of the TAC motor. If the PCM does not receive this positive voltage, a DTC P2118 sets.

      Throttle Actuator Control Motor Current Range/Performance.

      Probable Causes:
      1. Faulty sensor or solenoid
      2. Damaged or corroded connector terminal contact
      3. Wire harness problem. Check for voltage, open, short to ground, short to voltage
      4. Control unit software needs updating
      5. Faulty PCM or ECM

      Any of the above could be the real cause.
  • Sgrim625
    Sgrim625 - 1986 Pontiac 6000 - Engine - 10/7/2014
    Where can I find a manual for troubleshooting codes
    Check engine light is on. Catalytic converter is blocked, but I think the problem is residual of a sensor due to the CE light. I need to find troubleshooting code retrieval procedures, then list of troubleshooting codes.
     
    • Jimm
      10/7/2014 Jimm
      Try these websites; www.obd-codes.com, www.actron.com, www.troublecodes.net/gm - to list only a few.
  • Mark
    Mark - 2002 Pontiac Grand Am - Engine - 10/5/2014
    Why does my car run rough and has no power
    i CHANGED PLUGS CHECKED THE CIOL PACK CHECKED PLUG BOOTS AND SPRINGS ADDED INJECTION CLEANER AND IT STILL SEAM TO BE MISSING ON A COUPLE OF CYLIDERS AND RUNS ROUGH AND HAS NO POWER
     
    • Jimm
      10/5/2014 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
  • Mark
    Mark - 2002 Pontiac Grand Am - Engine - 10/5/2014
    Why does my car run rough and has no power
    i CHANGED PLUGS CHECKED THE CIOL PACK CHECKED PLUG BOOTS AND SPRINGS ADDED INJECTION CLEANER AND IT STILL SEAM TO BE MISSING ON A COUPLE OF CYLIDERS AND RUNS ROUGH AND HAS NO POWER
     
    • Jimm
      10/5/2014 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
  • Lorrie Rowell
    Lorrie Rowell - 2008 Pontiac Grand Prix - Engine - 10/2/2014
    Should dealership have flushed radiator and/or engine before or while replacing water pump
    110,000 miles This spring (Dallas Tx) car started running warmer than normal, not overheating, temp gauge shows running hot at times, not overheating. Does not overheat when it runs just sitting. It gets really hot when driven 40 highway miles @ 70 mph and then in ...
     
    • Jimm
      10/2/2014 Jimm
      The most common cause of overheating is because of an external leak from a water pump or a radiator or heater hose. The way to find the leak is to wait till it is overnight cold and maybe just pour water in and see if the leak is large enough to see it simply leak out from where it has a leak. if you pour in a half gallon or more and you still see no leak its time to pressure check the system.

      Here is a short list of possible causes for overheating;

      Low coolant level
      Leaking coolant
      Improper coolant concentration (not at recommended 50 / 50 mix of anti-freeze and water)
      Clogged radiator hoses
      Clogged heater hoses
      Clogged radiator passages
      Clogged heater core
      Faulty thermostat
      Faulty water pump
      Faulty radiator cooling fans
      Faulty radiator cooling fan switch (coolant temperature sensor)
      Faulty / worn serpentine drive belt
      Faulty / worn drive belt tensioner

      Yes,to answer your question- the repair shop should flush the radiator and cooling system before returning the vehicle to you.
  • Lorrie Rowell
    Lorrie Rowell - 2008 Pontiac Grand Prix - Engine - 10/2/2014
    Car getting hot while driving. drive 30 minutes @ 70 mph on highway then 30 mph around town in traffic starts to get hot
    AC working great. took to Dealership, they replaced water pump. Still getting hot while driving. Took back, they found air bubble. Then after driving 45 miles on highway @ 70 mph and then side streets for 10 min in traffic, vehicle now over heats, warning light ...
     
    0 answer
  • Dave
    Dave - 2000 Pontiac Grand Am - Engine - 9/26/2014
    Why does my car rev up to 3500-4000 rpm when started? What sensors might be involved?
    I ran my car through some deep water and it stalled out but restarted a few minutes later. When I got home (about 1/2 mile) I tried several things over the next several days. Removed and drained water from the air intake tubing replaced the air filter, changed the ...
     
    • Jimm
      9/26/2014 Jimm
      Several possibilities; engine vacuum leak, faulty IAC (idle air control) valve, faulty throttle body gasket or seal.
      Jimm
      9/26/2014 Dave
      Thanks. Gives me some more areas to check that I hadn't thought of. Appreciate it.
  • Tom Hagerstrom
    Tom Hagerstrom - 2006 Pontiac Solstice - Engine - 9/22/2014
    What keeps battery dying if sets for over a week?
    i have had battery tested. No draw shown on battery testing device. Battery will be dead if not driven within one week.
     
    0 answer
  • Eddie
    Eddie - 2004 Pontiac Grand Prix - Engine - 9/15/2014
    I have a trouble code that reads PO480 cooling fan1 circuit malfunction 1 replace all my relays in the fuse box an reset
    I drove for awhile to make sure the computer reset but when I cut the car off the check engine light comes back on . I took it to a mechanic they tell me everything is working properly but the trouble code keeps popping up so it won't pass inspection
     
    0 answer