It does not have a timing belt, It has a chain and it don't need changed.
To set the timing on a 1994 GMC Suburban you need to warm up the engine while the car is either in park or neutral. Next, you adjust the distributor until the timing is set to where you want it.
It is set by the computer. As long as you put the distributer in at the correct location the computer does the rest.
You need a timing light
On a Manual Transmission Located on Left Hand Side of Trans. As for the Automatic Transmission your on your own. Hope This Helps.
You need a timing light
you need a scanner
the LeSabre has a timing CHAIN. It does not need to be replaced. (unless you broke it :)
Need to replace the ingnition module in the Distributor.
you cannot adjust the ignition timing on this car. a manual will help if you need to set cam timing
There is no need or any way to "time" a 2.7L with a timing light.
You need to loosen the two 10mm bolts that hold the distributor in place. Connect your timing light to the #1 spark plug wire. Timing specification at idle is 10 degrees with the DLC connector jumped. You need a short piece of wire to connect the "DIAG" and "GND" terminals under the box that says "Diagnosis" under the hood. Rotate the distributor as needed to set the timing to 10 degrees.