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GMC engine repair questions and answers

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  • ql_lp
    ql_lp - 2007 GMC Sierra 1500 - Engine - 5 hours ago
    Sometimes the truck won't start as if no starter.
    Every once in awhile my truck won't start as if the starter was disconnected. But by leaving it for 30 to 45 mins it starts as if nothing happened. There is another way to start it quickly by boosting it off. Looking at the schematics it's pretty simple system. I ...
     
    • Chevy doctor
      5 hours ago Chevy doctor
      Sounds like a ignition switch problem. We have had issues with the under hood fuse block failing internally.
  • ql_lp
    ql_lp - 1993 GMC C1500 - Engine - 6 hours ago
    Truck starts when it wants to.
    Every once in awhile my truck won't start as if the starter was disconnected. But by leaving it for 30 to 45 mins it starts as if nothing happened. There is another way to start it quickly by boosting it off. Looking at the schematics it's pretty simple system. I ...
     
    0 answer
  • Wayne
    Wayne - 1998 GMC K1500 - Engine - 8/19/2014
    Have whine coming from the front engine compartment that comes with rpm until around 2500.
    Replaced PWRs st fluid and flushed system and it got a little better. Could it be anything other than the pump? Has 190k and don't want replace it needlessly.
     
    0 answer
  • Wayne
    Wayne - 1998 GMC K1500 - Engine - 8/19/2014
    Have whine coming from the front engine compartment that comes with rpm until around 2500.
    Replaced PWRs st fluid and flushed system and it got a little better. Could it be anything other than the pump? Has 190k and don't want replace it needlessly.
     
    0 answer
  • Jacob
    Jacob - 1994 GMC K1500 - Engine - 8/18/2014
    Why is my truck idling and driving rough
    I have a question so I have a 94 gmc serria with a tbi 350. When it starts up the idle is really low. And drives really sluggish. It sounds like it has an upgraded cam in it but my truck does not. Don't know whats wrong with it any ideas. I just had a new intake ...
     
    0 answer
  • thollis
    thollis - 1990 GMC C1500 - Engine - 8/17/2014
    Truck won't start has new starter new wires and alternator and battery is just fine and i have no power or anything
    i replaced the starter on it because it burned up and we tested it and it failed from the old started i also replaced the ground wires and the positive wires that went to the starter i also got my battery charged up and it was good.. i also replaced my ignition ...
     
    • jdl
      8/17/2014 jdl
      Did you check for voltage, anywhere? Use a test lite. Follow the B+ from battery, it may go to battery junction block or where-ever, but, check for voltage. Check for voltage at fuse circuits/fuse box. Some fuse circuits are hot all the time, some go hot with the key on.

      The issue could be a problem with fusible link, somewhere?
  • thollis
    thollis - 1990 GMC C1500 - Engine - 8/17/2014
    Truck won't start has new starter new wires and alternator and battery is just fine and i have no
    i replaced the starter on it because it burned up and we tested it and it failed from the old started i also replaced the ground wires and the positive wires that went to the starter i also got my battery charged up and it was good.. i also replaced my ignition ...
     
    • alex
      8/17/2014 alex
      their is a third wire to your starter a smaller one that takes power from the starter to everything els you missed that one when you changed the starter. it will be hanging down somewhere right by the starter.
  • Tevon
    Tevon - 1998 GMC K1500 Suburban - Engine - 8/16/2014
    Why does my check engine light come on an off?
    My check engine light comes on a stays on for about 2 days, then goes off for 4 to 5 days I have a code PO440 PO306'
     
    • Jimm
      8/16/2014 Jimm
      P0440 means Evaporative Emission Control System Malfunction. P0440 is triggered when a part of EVAP control system is not functioning efficiently.

      Here are the possible causes of P0440

      o Loose or missing gas cap
      o Incorrect or defective gas cap
      o Loose or damaged hoses around the EVAP purge solenoid
      o Defective purge solenoid
      o Clogged or defective purge valve
      o Clogged or damaged EVAP canister

      Possible solutions:

      o Remove and reinstall gas cap
      o Replace gas cap
      o Repair or replace hoses around the EVAP purge solenoid
      o Repair or replace purge solenoid
      o Repair or replace the purge valve
      o Replace EVAP canister

      A code P0306 may mean that one or more of the following has happened:
      Faulty spark plug or wire Faulty coil (pack)
      Faulty fuel injector
      Burned exhaust valve
      Poor compression
      Defective computer
  • Darrell Cheeseboro
    Darrell Cheeseboro - 2003 GMC Yukon - Engine - 8/16/2014
    I have code p0332
    Check engine light came on no drivability problems
     
    • Jimm
      8/16/2014 Jimm
      Replace both knock sensors. Pay close attention to the condition of connectors and pins.

      The parts are readily available from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities.
      In fact, they (RockAuto) list the knock (detonation) sensor from around $25.00 each for your vehicle.
  • gary woodard
    gary woodard - 2002 GMC Sierra 2500 HD - Engine - 8/12/2014
    Engine starts and quits immediately
    checked fuel pressure checked al wining and fuses bypassed the security system
     
    • jdl
      8/12/2014 jdl
      Can you check for applicable trouble codes to rule out the security system? If you have passlock that is a fuel injector disable.

      If not security issue, maybe the vehicle is trying to flood for some reason?
  • gary woodard
    gary woodard - 2002 GMC Sierra 2500 - Engine - 8/12/2014
    Engine starts and shuts down immediately
    by passed the security system did fuel pressure test checked all wiring and fuses
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2003 GMC Envoy - Engine - 8/10/2014
    Replaced with new factory fan clutch, fan still sounds like a jet engine when accelerating
    I have a 2003 GMC Envoy SLE. My SUV started making a noise like a jet engine taking off (coming from the fan) when i accelerate, also making a tinging sound. I checked for any codes with my OBD reader, and when i plugged in the reader it was blank. There was a blown ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2003 GMC Envoy - Engine - 8/9/2014
    Car will turn over but not start
    It has strong battery but it will not start. Fuel filter is clean, no fuel pressure at fuel rail. Tries to start with no elcelleration. I hear fuel pump for 3 or 4 seconds so I don't think it is the fuel pump. There is fuel pressure but not at the engine.
     
    • CVO
      8/9/2014 CVO
      Spray some aerosol starting fluid into the body throttle valve (CAUTION: Starting Fluid is Extremely Flammable!). Then crank the engine. If the engine starts until the starting fluid runs out..go to the next step.

      Try giving the bottom of the fuel tank a few whacks with a flat piece of wood or a rubber mallet while another tries to start the engine. You have a 50/50 shot at getting the pump going again and the vehicle starting. if it starts as a result of the whack then it confirms the bad fuel pump.

  • SD
    SD - 1987 GMC R1500 - Engine - 8/5/2014
    Rough idle when in gear. Smoother when in Park or Neutral.
    Distributor pick up coil, ign. coil, rotor (cap is in good shape), Ign. Control Mod. Fuel injectors, and now alternator have been replaced. Once I had the coils control mod and injector replaced all was well, Alternator was bad and replaced it. The alternator is ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2001 GMC Jimmy - Engine - 8/3/2014
    What to look for when codes P0102, P0200 ,and P0303 comes up , where to find the problem?
    i have replaced spark plugs wires valve gaskets vacume hoses sensors releys almost everything i can think of and still having issues it starts runs alittle but the timing is way off and it shakes please help
     
    • Chevy doctor
      8/3/2014 Chevy doctor
      P0200 means there is a problem with your injector control circuit and being you have p0303. Your misfire is on # 3 cylinder. Test the injector driver and coil on cylinder #3 injector. You more than likely have a bad injector or pcm driver that us burnt out in you pcm(engine control computer)..
      Chevy doctor
      8/3/2014 Chevy doctor
      P0102 is a map sensor code which can set due to misfiring.