These trucks had bad problems with carbon buildup on the piston skirts. When this happens, they will have a ticking noise on cold start up for anywhere from 3 to 30 seconds. After that, the noise stops.
The solution is to remove all of the spark plegs from the engine when it is cold. Use a funnel and rubber hose to pour in 1/4 bottle of seafoam or GM top engine cleaner into each cylinder. Allow the stuff to sit overnight. Cover the engine with some old towels to pevent solvent from contacting painted surfaces. Unplug the two main ignition coil connectors. Crank the engine over to blow out all of the solvent and carbon. Change the oil and filter. Put the plugs back in and connect the coils, then start the engine. It will smoke real bad for a few min, but the ticking noise should be gone for a while.(20-30K miles) If you still have the noise after this, you probably have some weak lifters.
Sunday, February 26th, 2012 AT 4:44 PM