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GMC engine repair questions and answers

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  • Brandon S.
    Brandon S. - 1984 GMC S15 - Engine - 11/18/2014
    Why do i Flood randomly after shutting my vehicle off
    When its running runs okay just bogs a lot until warmed up feels like my choke is hesitating I haven't checked that yet but I have a brand new fuel system including carb filter line gasket everything even pump spark plugs are new oil change last 150 miles everything ...
     
    0 answer
  • Stew
    Stew - 2007 GMC Sierra 1500 - Engine - 11/17/2014
    Truck shutters and shifts in and out of overdrive at 40 - 50 mph and about 1500 rpm. Trans has been reworked but...
    Thought it was the transmission that had about 35,000 miles sense rebuilt. The transmission placed agreed and tore it apart and replaced all suspect parts, but it still does it. My thought is it is switching between 4cyl and 8cyl. No lights or codes, but you can ...
     
    0 answer
  • Alex1
    Alex1 - 2005 GMC Envoy - Engine - 11/17/2014
    I replaced the fuel pump in my car, and after I did that, the car won't start, what could be wrong?
    I know the fuel pump is good, but for some reason, something is telling it not to start.
     
    0 answer
  • victor
    victor - 2004 GMC Envoy - Engine - 11/14/2014
    Cam shaft and cam sensor not in alignment.
    check engine light came on had the codes scanned and it said cam shaft and can sensor not in alignment. Any info would be great.
     
    0 answer
  • victor
    victor - 2004 GMC Envoy - Engine - 11/14/2014
    Cam sensor and cam shaft not in alignment.
    engine check light came on had the codes read and it said cam shaft and cam sensor not in alignment any info would be great
     
    0 answer
  • ql_lp
    ql_lp - 2007 GMC Sierra 1500 - Engine - 11/13/2014
    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
      8/20/2014 Chevy doctor
      Sounds like a ignition switch problem. We have had issues with the under hood fuse block failing internally.
    • judd0081
      11/13/2014 judd0081



      This may be related to the antitheft system The system is known for turning of the starter or injectors when it fails. Is there a light on the dash that says SECURITY? This is a common problem worth looking into. http://www.diy-gm-security.com/
  • glen
    glen - 2001 GMC Sonoma - Engine - 11/13/2014
    No start intermittent
    intermittent crank but no start fixes itself after days or weeks of trying to start it
     
    • jdl
      8/26/2014 jdl
      When the problem is ongoing, if it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If you have spark everywhere, check fuel pressure. With intermittent issues, you need to test when problem is ongoing.

      Check for intermittent rpm signal? No rpm signal, no start. Can be intermittent.

    • judd0081
      11/13/2014 judd0081

      This may be related to the antitheft system The system is known for turning of the starter or injectors when it fails. Is there a light on the dash that says SECURITY? This is a common problem worth looking into. http://www.diy-gm-security.com/
  • Hull
    Hull - 2002 GMC Sierra 1500 HD - Engine - 11/13/2014
    Why does my engine start so hard when the engine is warm.
    When the engine is warm, and not every time, the starter needs to crank for several seconds before the engine turns over.
     
    0 answer
  • glenbinegar
    glenbinegar - 2002 GMC Savana 3500 - Engine - 11/12/2014
    Tapping sound from front passenger side of engine compartment. may be coming from vacuum pump
    150K, not quite regular rhythm 2-3 hz. none of the pulleys appear to be loose. no appreciable bearing noises. How can I check the vacuum pump operation?
     
    0 answer
  • Tevon
    Tevon - 1998 GMC K1500 Suburban - Engine - 11/9/2014
    Why won't my ignition switch turn to reverse?
    156000 miles. My ignition key will turn to start up my vehicle but wont turn in reverse when needed to use the audio without starting up.
     
    0 answer
  • Lori K
    Lori K - 2007 GMC Sierra 1500 - Engine - 11/9/2014
    Truck goes crazy. Is it a computer module? which one? battery cable? voltage regulator checks out ok.
    Symptoms include: while driving, suddenly door locks go crazy, lock and unlock all by themselves, then gauge needles go crazy, RPMs rev, speedometer buries at 120, then back to 0. Cab lights flash, gear indicator goes from drive to park and back again, headlights ...
     
    0 answer
  • riangel
    riangel - 2003 GMC Envoy - Engine - 11/3/2014
    What would cause the engine to stall while driving?
    It acts as if it is out of gas, the tank is full. I've also had a complete tuneup done plus the fuel pump relay replaced.
     
    • Nancy Long
      11/3/2014 Nancy Long
      It may be due to a bad fuel pump or regulator, or a clogged fuel filter or injectors. Bad gas or gas contaminated with chemicals or water is another possible cause too.
  • Larry
    Larry - 2011 GMC Yukon XL 1500 - Engine - 11/3/2014
    Apparent battery issues
    I had a very strange occurrence two days ago with my 2011 gmc Yukon XL/Denali. My wife and I go to the Sonic drive-in for a burger. It was mid day so no interior lights were on, and the radio was off. We were there for 20 minutes. Time to leave-I turned on the ...
     
    0 answer
  • dan mazur
    dan mazur - 2005 GMC Envoy - Engine - 10/29/2014
    The shut down power to the engine light comes on at any given time and the car decreases to a speed of 5-8 miles/hr.
    This car has been into a gmc dealership 3 times for this reason and stated it could be one of many things causing this. What they fixed did not fix the problem. This is a very dangerous situation when it happens
     
    • Jimm
      10/29/2014 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.

      This first step is important - as there maybe literally hundreds of possible fault codes. We need the specific code or codes - to help diagnose the issue you are having.
  • dan mazur
    dan mazur - 2005 GMC Envoy - Engine - 10/29/2014
    Shut down power to the engine light keeps coming on--been in gmc dealership 3 times and still not fixed-dealership said
    it could be a number of things--this is a very dangerous situation as it can happen at any time in any conditions.
     
    • Jimm
      10/29/2014 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.

      This first step is important - as there maybe literally hundreds of possible fault codes. We need the specific code or codes - to help diagnose the issue you are having.