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GMC preventive maintenance repair questions and answers

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  • AutoMD Member
    AutoMD Member - 1980 GMC C1500 - Preventive Maintenance - 3/23/2014
    1972gmc c10 350 5.7 need procedure on stabbing dist.and timing alignment
    I need foolproof steps to align timing to stab dist.
     
    • Jimm
      3/19/2014 Jimm
      Need more information - is the distributor out of the engine, and you need basic instruction for the reinstallation - and timing of the engine and distributor - is this correct?
    • Jimm
      3/19/2014 Jimm
      If yes, then here are the specific steps;

      1) Remove the number 1 spark plug from the number 1 cylinder

      2) Rotate the crankshaft to align the timing marks (crankshaft pulley to the timing scale) - at the same time - be sure the number 1 piston is at TDC (top dead center) - with no valves; intake or exhaust - open.
      This piston position is critical because the distributor installation and alignment is based on the number 1 cylinder and piston at TDC on the compression-to-power stroke. Recall the four stroke engine has; intake, compression, power and exhaust - cycles or strokes.

      3. Once the piston is confirmed at TDC on the compression stroke - with the number # 1 spark plug removed (using a flashlight to observe or slim screwdriver to 'feel' and confirm the top of the piston) - then install the distributor so that the ignition rotor is pointing to the number 1 plug wire position on the distributor cap. This may take several tries with the distributor gear teeth so be patient - especially with the distributor drive gear as helical design - the distributor shaft will tend to rotate as the distributor gear is engaged on the camshaft gear and as the distributor is lowered / pressed into place.

      4. Leave the distributor hold-down clamp loose enough to be able to rotate the distributor - and snug enough to enable the distributor to maintain position. This step is required to obtain the final timing setting using a timing light according to the specification at base engine idle speed; 600 - 700 RPM - for example.

      5. That is it - reinstall the number 1 spark plug and replace the spark plug wire.

      If the ignition system; plug wires, spark plugs, coil - are all OK - then with a charged battery, strong spark and fresh fuel with all vacuum hoses conencted - the engine should start. As long as the base timing is correct - it should take no more than a slight twist or rotation of the distributor housing to have the engine start and run.

      You may reference the 'How-To-Guides' feature 'How to Replace a Distributor' on the AutoMD website for the specific steps to install and adjust the distributor for the base engine timing.
    • John's Auto Repair
      3/23/2014 John's Auto Repair
      What is stabbing the distributor suppose to mean?
  • diana
    diana - 2003 GMC Sierra 1500 - Preventive Maintenance - 2/20/2014
    The battery light is on says not charging when I start it in the morning. Goes normal after 1/2 hour.
    Normally needle is 1/2 way, straight up. Now it's at quarter way and dropping as I drive for the first while. What's up with this.
     
    • HouseCallAuto
      2/20/2014 HouseCallAuto
      Confirm the low charging voltage with a voltmeter across the battery. Replace the alternator
      HouseCallAuto
      3/1/2014 diana
      Thanks! It was alternator.
  • diana
    diana - 2003 GMC Sierra 1500 - Preventive Maintenance - 2/7/2014
    How much pressure should be in my tires?
    My door sticker is gone.
     
    • jdl
      2/7/2014 jdl
      For the standard tire, my info says 35 psi. The info on the side of the tire should tell you.
      jdl
      2/8/2014 jdl
      My info says the oem tire for this vehicle is p245/75r16. It said 35 psi. I agree, if that is the max spec, back off a little.
      jdl
      2/8/2014 jdl
      Just to add, I did check the owners manual for this vehicle for the tire pressure spec, didn't see one listed? Maybe I just overlooked it?
    • AutoMD Member
      2/7/2014 AutoMD Member
      The recommended tire pressure for your specific vehicle will be listed in the drivers door jam or in your owners manual. As tires are made to fit many applications, do not use the psi rating that is on the tires.
      AutoMD Member
      2/7/2014 diana
      My sticker is missing
    • Jimm
      2/7/2014 Jimm
      Check the recommended pressures as listed in the vehicle ownersmanual. You can go ahead and use the PSI ratings on the tire sidewall - just be sure to decrease from this maximum pressure by some 5 PSI or so.
  • rlhanson58
    rlhanson58 - 2008 GMC Acadia - Preventive Maintenance - 1/31/2014
    How do i get the tracking stablitiy and abs light to go off of my dashboard warning
    mileage is 78,000, dealer reset this feature about six weeks ago. recently it has reoccured. It comes on once in a while for no apparent reason while engine is hot. There are no other lights coming on. The check engine light does not come on. The dealer mentioned ...
     
    • HouseCallAuto
      1/31/2014 HouseCallAuto
      The dealer did not school you on everything. When the abs light illuminates, it also turns on a stability light or message. The cause is most likely ABS component related like for example a bad wheel speed sensor. There will be a fault code stored in the abs control module that can be accessed with a professional scanner that you do not have. If the problem is intermittent which is common, someone can hook up the scanner and erase any codes that are there, but if the cause was not solved - for example replacing a wheel speed sensor, then in some amount of time the fault code will return and turn the lights on again. This is what may have happened, not sure. But that is how these systems work. A reset is just that - a reset. A reset is not a fix, it might only be a temporary thing that does no more than turn the lights off but as soon as the computer sees the malfunction again it will set codes again and turn lights on again.
  • mtnmami4
    mtnmami4 - 1999 GMC K1500 Suburban - Preventive Maintenance - 1/9/2014
    Coolant hose and nipple that hose connects to broke off and coolant spilled all over. what caused this?
    My suburban recently started back firing/ mis fire DTC.90300 could this coolant hose been the problem?
     
    • HouseCallAuto
      1/8/2014 HouseCallAuto
      Not likely. The code P0300 is a random misfire code. In many cases the cause is leaking intake manifold gaskets or the Crankshaft Variation Learn Procedure has to be done using a scan tool that is capable of this procedure.
    • AutoMD Member
      1/9/2014 AutoMD Member
      coolant will corrode aluminum parts if ph balance of the antifreeze is off.
  • AutoMD Member
    AutoMD Member - 1998 GMC Sonoma - Preventive Maintenance - 12/20/2013
    There`s two rubber plugs at the bottom of the big part of the transmision one of them leaks while setting
    it happen while setting while being cold or warm it happens all the time I noticed it when I chanced the oil cooler lines The leak has been there for some time No lights are on
     
    • HouseCallAuto
      12/20/2013 HouseCallAuto
      Have you confirmation of what liquid is leaking - engine oil, coolant, trans oil?
  • Karen Begin
    Karen Begin - 2008 GMC Yukon - Preventive Maintenance - 12/14/2013
    Denali has used 2 batteries in 5 yrs. Could there be a problem draining the battery?
    Could there be something in the engine or computer that is draining the battery so it only lasts 2 yrs?
     
  • AutoMD Member
    AutoMD Member - 2000 GMC Jimmy - Preventive Maintenance - 10/25/2013
    Flashing intermittent warning lights
    the warning lights flash at odd times while driving .. nothing consistent seems to trigger it. They come on normally at start up , then oddly at different times while driving.
     
    • HouseCallAuto
      10/25/2013 HouseCallAuto
      This is usually a bad ignition switch, and I wouldn't be surprised if you could make it happen by jiggling the ignition key while driving.
  • AutoMD Member
    AutoMD Member - 2011 GMC Sierra 2500 HD - Preventive Maintenance - 10/22/2013
    "Diesel exhaust fluid of poor quality" This is what the indicator light shows in the dash.
    added 2.5 gallons of fresh fluid and no change in dash message. The vehicle is currently at the GM dealer in Glen Burnie, Md. They are trying to locate problem and have no answer as of yet. Please advice.
     
    • HouseCallAuto
      10/22/2013 HouseCallAuto
      They will solve it better than anyone else. Give them space to do what they gotta do. Even if that means they call up their own OE sources for further info. I believe there is also an updated programming flash for this concern along with some kind of regeneration procedure that I know almost nothing about and neither does anyone else I bet, just a handful. Diesel Exhaust Fluid is a relatively new thing and not every tech knows about every single thing that can go wrong on newer vehicles. They will solve it though where anyone else will start selling you parts and services and hope that does it.
  • sam
    sam - 1985 GMC G3500 - Preventive Maintenance - 10/20/2013
    Alternater bolt stripping
    cant fully tighten alternator belt i need a solution b-4 i replace it
     
    • HouseCallAuto
      10/20/2013 HouseCallAuto
      I believe that you are saying that the aluminum ear of the alternator now has damaged / stripped threads. Is that correct? If that is the case simply replace the bolt but place a nut on the inner side where the bolt comes through the alternator. If this is not what describes your issue, please expand your details more.
  • ryoungyou
    ryoungyou - 2000 GMC Sierra 1500 - Preventive Maintenance - 6/20/2013
    Air condition work fine sitting still idleing, drive over 35 mph air condition stops, the clutch stops, starr back at 35
    freon is full and oil
     
    0 answer
  • knox
    knox - 1998 GMC Sonoma - Preventive Maintenance - 6/11/2013
    Ideas on vehicle temp moving up even though vehicle has plenty of coolant and only does it on hot days
    Temp moves up on hot days even though vehicle has plenty of coolant
     
    • HouseCallAuto
      6/11/2013 HouseCallAuto
      If putting on the heater on high gets the temperature down (try it) then it is likely that you have a clogged up radiator. The fix is replace the radiator. Make sure that you are checking the coolant level in the radiator directly and not just looking in the plastic overflow container
  • vanchozker
    vanchozker - 2001 GMC Yukon XL 1500 - Preventive Maintenance - 6/2/2013
    HI I have a GMC Yukon 01 Having problem with the ac
    HI I have a GMC Yukon 01 Having problem with the ac Since last year the ac light gets on only when I go above 50 mph for one mile then its whose working till I turned off the car and if I turned it off the ac its will get on back right away sometimes if I turn on ...
     
    • stackcar
      6/2/2013 stackcar
      Hi,

      As well as asking here, try asking this to mechanics directly. I get lots of help their with my auto questions at likeplum. They have mechanics online to help you for free now!

      visit: www.likeplum.com/user/learn/auto

      Just wanted to let you know,
      -Trevor
  • vanchozker
    vanchozker - 2001 GMC Yukon XL 1500 - Preventive Maintenance - 6/2/2013
    Yukon 01 ac problem getting on and off
    HI I have a GMC Yukon 01 Having problem with the ac Since last year the ac light gets on only when I go above 50 mph for one mile then its whose working till I turned off the car and if I turned it off the ac its will get on back right away sometimes if I turn on ...
     
    • stackcar
      6/2/2013 stackcar
      Hi,

      As well as asking here, try asking this to mechanics directly. I get lots of help their with my auto questions at likeplum. They have mechanics online to help you for free now!

      visit: www.likeplum.com/user/learn/auto

      Just wanted to let you know,
      -Trevor
      stackcar
      6/2/2013 vanchozker
      thanks for the info
  • pwade49
    pwade49 - 2003 GMC Yukon - Preventive Maintenance - 5/21/2013
    How do you replace windshield wipers on a yukona denali
     
    • CVO
      5/21/2013 CVO
      Local auto parts stores will replace this vehicle windshield wipers for free of charge as a gesture of courteous.
 
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