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GMC engine repair questions and answers

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  • sonny
    sonny - 2003 GMC Sierra 1500 - Engine - 3/30/2015
    My truck stalls out only when the a/c comes on but not every time
    I have 60000 miles I put on a new alt 2 times.If I don't have the defrost on it don't stall or a/c. there are no codes
     
    0 answer
  • harve
    harve - 1999 GMC K1500 Suburban - Engine - 3/28/2015
    Will turn but will not start
    we have already changed the starter battery plugs(not wires)alternator and fluids the engine hasn't been started in over a year. we can get it to turn but it dies out
     
    0 answer
  • Lou
    Lou - 2005 GMC Canyon - Engine - 3/19/2015
    On long trips I use a quart of oil with every fill up. 300 miles or more.
    I can drive around town for months without burning any oil. Vehicle mileage is 96,000.
     
    • Jimm
      3/19/2015 Jimm
      Either a serious leak or the engine burns (uses) more oil at the higher speeds.
  • Soccerfreak303
    Soccerfreak303 - 2001 GMC Sonoma - Engine - 3/17/2015
    GMC Sonoma will not turn over, replaced starter, ignition switch, and battery.
    I have a 2001 GMC Sonoma. Last week I went to start it and it would not turn over, crank or click at all. I tested my battery and it had a bad cell. Before buying a new battery I went ahead and tested my dad's battery in there and it still wouldn't turn over or ...
     
    0 answer
  • Soccerfreak303
    Soccerfreak303 - 2001 GMC Sonoma - Engine - 3/17/2015
    GMC Sonoma will not turn over, replaced starter, ignition switch, and battery.
    I have a 2001 GMC Sonoma. Last week I went to start it and it would not turn over, crank or click at all. I tested my battery and it had a bad cell. Before buying a new battery I went ahead and tested my dad's battery in there and it still wouldn't turn over or ...
     
    0 answer
  • Gmcgirl
    Gmcgirl - 1993 GMC C1500 - Engine - 3/16/2015
    What's wrong with my truck
    I have a 1993 gmc Sierra 4x4 350 5.7l My truck runs fine when I start it up. After a few minutes it wants to stall, jerks on acceleration, and wants accelerates when you have your foot on the break. I have already replaces the spark plugs, fuel filter, fuel pump, ...
     
    • Jimm
      3/16/2015 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.

      Do not skip this important first step - there are literally hundreds of possible fault codes. Avoid wasting/ throwing money at the problem.

      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
  • ED D G
    ED D G - 2005 GMC Envoy - Engine - 3/7/2015
    My engine intermittently runs hot then quickly cools down. What should I look for first?
    My temperature gauge on the dash raises to the 3/4 mark or higher intermittently then the it sounds like the coolant fan cuts on and cools it down. I also get a warning light that indicates one of my sensors are bad. There are no fluid leaks.
     
    • Jimm
      3/7/2015 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.

      Do not skip this important first step - there are literally hundreds of possible fault codes. Avoid wasting/ throwing money at the problem.
  • MatthewWilder
    MatthewWilder - 2003 GMC Envoy - Engine - 3/4/2015
    Engine squeaks near power steering pump and gets louder as i press the gas. what could be the problem?
    Just had new power steering pump put in. it didnt do it before they fixed it. The reason i had a new pump put in is because i hit black ice and hit a small snow bank then could barely turn. No lights are on in my dash.
     
    • Jimm
      3/4/2015 Jimm
      Several possibilities; misalgined belt-driven component (including the steering pump), belt drive idler pulley worn, belt tensioner worn.
  • Thoom
    Thoom - 1999 GMC Yukon - Engine - 3/4/2015
    Not starting engine turns but will not fire
    175,000 replaced rotor cap wires same result only happens when vehicle is cold and has not been started for over 12 to 14 hours many times after 2 to 3 hour after 1st attempt vehicle will start and restart all day happens mostly on damp days
     
    0 answer
  • DIVA2DZ
    DIVA2DZ - 2001 GMC Sierra 1500 - Engine - 2/25/2015
    WONT START LIGHTS WORK NO SOUNDS AT ALL ON MY 2001 GMC SIERRA
    DOESNT HAPPEN ALL THE TIME BATTERY HAS BEEN CHANGED BUT NO HELP DASH LIGHTS WORK WHEN KEY IS TURNED ON THEY DIM BUT NO SOUNDS ARE MADE AT ALL
     
    0 answer
  • nana
     
    • JustinM90
      2/18/2015 JustinM90
      Make sure to check your fuel filter and fuel pressure regulator (damaged or vacuum line)
  • 1996
    1996 - 1996 GMC K1500 - Engine - 2/18/2015
    Check engine light comes on in cold weather
    After this happens the code reader says control module misfire. After warmer tempertures the light goes off.
     
    • Jimm
      2/17/2015 Jimm
      The check engine light is located on the dash and stays on if the computerized engine control system detects an engine performance or emissions problem.

      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.
      Jimm
      2/17/2015 1996
      OBDII P1345, after more digging I found suspected valve timing off, cam or crankshaft sensor loose on mounting or faulty cam or crankshaft position sensor. Don't know why it will only happen when temperatures go below freezing and then crank up engine? Not often I live in GA.
    • Jimm
      2/18/2015 Jimm
      P1345 = Crankshaft position sensor / camshaft position sensor correlation error.

      Possible causes;
      Check the distributor drive gear and the timing (have seen the gear wear to cause this code)
      If you remove the distributor check for a worn drive gear or excessive endplay.
      At the base of the distributor shaft under the rotor button for oil leaking from the bushing in the distributor, it can leak and contaminate the cam sensor.
      Jimm
      2/18/2015 1996
      I bought this truck used eight years ago. It has a GM crate engine that came out of a wrecked truck. It has about 140,000 miles on it I think. I understand what you are saying about the possible worn gear and/or leaking bushing. Is that gear fiber or metal? I'll have to find someone to take it to as I can't do the setting of the timing. Old 283 C.I. I did pull the distributor but don't have a scanner and expertise to do this repair. Why it happens in cold weather or is it just coincidence?
  • mike1976
    mike1976 - 1999 GMC K3500 - Engine - 2/10/2015
    Truck sometimes has a very hard time starting.
    Truck has hard time starting sometimes. Truck will finally start after 20 minutes or more holding gas pedal to floor, compressing and decompressing. Fuel pump was replaced last year. It has this problem sometimes, when it doesn't do this it starts right up.
     
    0 answer
  • rdoss
    rdoss - 1992 GMC C1500 - Engine - 2/9/2015
    I took a 454 out of my Winnebago and I am trying to install it in my 92 GMC 1500 . I cannot get headers to mount up
    A friend told me I needed to notch the frame , if this is true please explain !!!!. If there are any tricks of the trade to this I would love to know . thank you , Doss
     
    • Jimm
      2/9/2015 Jimm
      The motor will drop in with no clearance issues. I cannot recall if you have to change motor mounts. The exhaust may need to be modified. You need to find a truck with a stock TBI 454 (3/4 - 1 ton) and remove the PROM in the ECM.
      The transmission is a different story. Your truck has a 4L60 or 4L60e it will bolt up but, the 454 will destroy it. There are some options but it depends on if you have a 2wd or 4wd.
  • steve
    steve - 2004 GMC Sierra 1500 - Engine - 2/3/2015
    Codes p0135,0141,0161,0151
    changed all my o2 sensors to high performance ones, cleaned my k&n filter, cats were changed last year. ticks early in morning when cold then goes away when heated up it seems. check engine light comes on first thing in morning after resetting it. right away. please ...
     
    0 answer