LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
GMC
>>
1989
>>
Forward Control 4.8 T, Standard
>>
Repair and Diagnosis
>>
Engine Performance
>>
Adjustment
>>
Tune-Up - Diesel
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.
Tune-Up - Diesel
Expand All (for easy ctrl-f)
Collapse All
Adjustments
Valve Arrangement
Valve Clearance
Glow Plugs
Injection Pump Timing
Hot (Slow) Idle Rpm
Cold (Fast) Idle Rpm
Vacuum Regulator Valve/Detent Switch Adjustment
6.2L Engine W/Heavy Duty Emissions & Automatic Transmission
Servicing
Emission Control
Specifications
Fuel System
Batteries
Service Intervals
Belt Adjustment
Capacities