Tune-Up Specifications

Spark Plug Gap 0.035 in
Ignition Timing

Fig. A:

Firing Order shown
Firing Order 1-3-4-2
Degrees BTDC [2]
Minimum Air Flow @ Idle 600 CFM @ 1300 RPM
Fuel Pump Pressure 49 PSI [3]
Valve Clearance [1]

BTDC Before Top Dead Center
[1] Equipped w/hydraulic valve adjusters. No adjustment is necessary.
[2] Controlled by Powertrain Control Module; not adjustable.
[3] Remove cap from fuel pressure test port on fuel rail. Connect a suitable fuel pressure test gauge to fuel rail test port. Connect DRB scan tool, or equivalent. Place ignition switch in ON position, then use scan tool to activate ADSD fuel system test.