Question about GMC Sierra 1500

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WHEN STARTING TRUCK AND CUTTING IT OF , IT MAKES A KNOCKING NOISE FOR ABOUT 15 SECONDS OR MORE.

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Hi and welcome to FixYa!

You may need to have the valve clearance adjusted. If it's too far it can really make a very annoying noise till warmed up. Once the valve adjustment is done, have an oil change. This can make the engine run smooth again.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on Mar 11, 2011

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My experiance tells me you should look at bad gas, timing, then the valves. These all can cause the noise your hearing, the last thing could be piston slap, if your motor is old this maight be the cause.

Posted on Mar 11, 2011

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