Question about 1997 GMC Sierra K2500

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Adjust timing on 1998 GMC K2500 pick up 5.7 liter

Long story short, it just keeps turning over but will not start. I put in a new gas tank, fuel pump, changed plugs/wires/cap and rotor. I know the engines getting gas, spark and air so why won't it start?

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  • tc_transport Nov 09, 2008

    I changed the timing chain and now have no fire from the distributer

  • sjabsky Jan 10, 2009

    The problem is it won't start - I cannot check it at any rpm. Same deal I have gas & spark, but will not even fire.

  • mhbowen May 11, 2010

    most all of the timming can be done with disconnecting the brown advance connector,,, mine is under the glove box,,, some are in the glove box... this quick disconnect is the timming advance for 5.7 engines and can solve the problem with timming settings.... once disconnected the timming will not advance from the computer and you can set the timming accordingly,,, once the timming is set and the connection is back then when the engine warms up you should see 14-degrees before TDC,,,, easy to do once you find that brown wire connector,,, some repair manuals give it a different color.



    as for not starting,,,, the ignition key that supply's voltage to the distribitor,,, may be the problem,,, i have seen the ignition switch not work correctly causing this problem.... if you supply 12v from the battery to the distribitor and get a spark,,, one of 2 things,,, the switch or the computer box is fried..

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It has to be done with a scanner. You can adjust this distributor, but there are no timing marks to watch as you move it. There is a timing mark on the balancer and on the timing cover for referencing Top Dead Center #1 cylinder only, but it is only used for dropping the distributor in to get the engine up and running. A scanner is needed to properly adjust the timing. Connect the scanner and look for a data parameter labeled ‘cam offset’ or possibly ‘cam ******.’ It will be listed in degrees. Start the engine, and bring it up to 1500 rpm. Note the reading. If the timing specification is not within plus or minus two degrees of zero, you need to move the distributor. You can move the distributor with the engine running but the timing will not change. After you move the distributor, the ignition has to be cycled off to let the computer learn the new timing spec. Restart the engine, bring it up to 1500 rpm and see what the new spec is. You must repeat this procedure until you get the timing into the specification as mentioned above. Once you have it set to spec, the code should clear.

Posted on May 18, 2008

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