Having the right tune-up specification information is essential to keeping your 2.8L V6 Chevrolet S10 pickup (GMC S15 pickup, GMC Sonoma) on the road and running at its best.
Whether you're a seasoned mechanic or just a DIYer looking to keep your vehicle running smoothly, this post has you covered.
Contents of this tutorial:
APPLIES TO: This tutorial applies to the following vehicles:
- 2.8L Chevrolet S10 Pickup: 1988, 1989, 1990, 1991, 1992, 1993.
- 2.8L GMC S15 Pickup: 1988, 1989, 1990.
- 2.8L GMC Sonoma: 1991, 1992, 1993.
Ignition System Specifications
| Spark Plug Air Gap |
|---|
| 0.045 inches |
| Spark Plug Torque |
|---|
| 11 lb.ft |
| Original Equipment Spark Plug |
|---|
| AC R43TSK |
| Spark Plug Cable Resistance | |
|---|---|
| 0-15 inch long cable | 3,000 - 10,000 Ohms |
| 15-25 inch long cable | 4,000 - 15,000 Ohms |
| 25-35 inch long cable | 6,000 - 20,000 Ohms |
| Base Ignition Timing |
|---|
| 10° BTDC (before top dead center). NOTE: The SET TIMING connector must be disconnected. |
Ignition timing adjustment procedure:
- Start the engine and let it reach its normal operating temperature.
- Keep the air cleaner installed.
- A/C must be OFF.
- Transmission in Park Or Neutral.
- Disconnect the SET TIMING connector (tan with black stripe wire) taped to the harness below the heater case in the passenger compartment (see image 2 of 2 in the image viewer above).
- The 4-wire distributor connector must remain connected to distributor.
- Connect a timing light to the cylinder 1 spark plug wire.
- Adjust to specification by loosening distributor hold down bolt and rotating the distributor.
Ignition system test tutorials:
- How To Find A Misfiring Cylinder (1988-1993 2.8L Chevrolet S10 Pickup, GMC S15 Pickup, GMC Sonoma).
- How To Test The Ignition Coil -No Start Tests (1988-1993 2.8L Chevrolet S10 Pickup, GMC S15 Pickup, GMC Sonoma).
- How To Test The Ignition Control Module (1988-1993 2.8L Chevrolet S10 Pickup, GMC S15 Pickup, GMC Sonoma).
- What Do The Spark Plugs Do? (1988-1993 2.8L Chevrolet S10 Pickup, GMC S15 Pickup, GMC Sonoma).
Fuel System Specifications
| 1991-1994: Fuel Pressure With Key On Engine Off |
|---|
| 9-13 PSI |
| Fuel Pressure With Key On Engine Running |
| 9-13 PSI |
The fuel pump pressure test is the most accurate way of testing the in-tank fuel pump of your 2.8L V6 Chevrolet S10 pickup (GMC S15 pickup, GMC Sonoma).
To perform the test, a special adapter must be used to connect the fuel pressure test gauge to the fuel system. This adapter is installed between the fuel filter and the fuel line.
The fuel pressure test kit, which includes the gauge and adapter, is not expensive and can be easily purchased at your local auto parts store or online.
I've written a step-by-step tutorial on how to test fuel pressure to make the process even easier for you.
Serpentine Belt Diagram
- 2.8L engine without air conditioning and power steering, see figure 1 of 3.
- 2.8L engine with power steering but without air conditioning, see figure 2 of 3.
- 2.8L engine with power steering and air conditioning, see figure 3 of 3.
