Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Calibration Number Identification
To identify engine calibration number, locate engine code label on valve cover at front of engine. See Fig 1. Calibration codes usually begin with a number indicating current model year. For example, calibrations for 1989 usually begin with "9". Each vehicle is also equipped with an emission control data decal which applies to that vehicle and engine. See Fig 2. These decals are usually located on underside of hood or other visible engine compartment location.
| Abbreviation | Definition |
|---|---|
| A/CL BIMET | Air Cleaner Temperature Sensor |
| A/CL CWM | Air Cleaner Cold Weather Modulator |
| A/CL DV | Air Cleaner Duct and Vacuum Motor |
| ACT | Air Charge Temperature Sensor |
| ACV | Air Control Valve |
| AIR BPV | Air By-Pass Valve |
| ANTI B/F | Anti-Backfire Valve |
| BVT | EGR Backpressure Modulator |
| CBV | Vacuum Bowl Vent & Vacuum Thermostatic Bowl Vent Valve |
| COMP VLV | Hot Idle Compensator |
| CPRV | Canister Purge Valve |
| DV-TW | Vacuum Delay Valve |
| EGRC | EGR Control |
| EGRV | EGR Vent |
| EVR | Emission Vacuum Regulator |
| FLTR | EGR Vacuum Control Valve Filter |
| FPR | Fuel Pump Relay |
| IVV | Thermactor Idle Vacuum Valve |
| SILN | Air Silencer |
| LCV | EGR Load Control (WOT) Valve |
| MAP | Manifold Absolute Pressure Sensor |
| PURGE CV | Canister Purge Valve |
| SA-FA | Fuel Vacuum Separator |
| SOL | Distributor Modulator Valve Assembly 3-Port |
| SOL V | Distributor Modulator Valve Assembly 1-Port |
| SV-CBV | Carburetor Fuel Bowl Solenoid Vent Valve |
| TAB | Thermal Air Bleed |
| TAD | Thermactor Diverter |
| T REST | Vacuum Restrictor |
| TSP-VOTM | Throttle Solenoid Positioner w/ Vacuum Operated Throttle Modulator |
| TVS | Temperature Vacuum Switch |
| TVV | Carburetor Fuel Bowl Thermal Vent Valve |
| VACVV-D | Vacuum Vent Valve |
| VCS | Vacuum Control Solenoid |
| VDV | Vacuum Delay Valve |
| VO ISC | Vacuum Orifice Idle Speed Control |
| VOTM | Vacuum Operated Throttle Modulator |
| VRDV | Vacuum Delay Valve |
| VRESSER | Vacuum Reservoir |
| VREST | Vacuum Restrictor |
| VREST FLTR | Vacuum Vent Filter Assembly |
| VRV | EGR Venturi Vacuum Amplifier |
| VVA | EGR Venturi Vacuum Amplifier |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.