VISUAL INSPECTION
Visually inspect all electrical wiring, looking for chafed, stretched, cut or pinched wiring. Ensure electrical connectors fit tightly and are not corroded. Ensure vacuum hoses are properly routed and are not pinched or cut. See VACUUM DIAGRAMS article to verify routing and connections (if necessary). Inspect air induction system for possible vacuum leaks.
MECHANICAL INSPECTION
| WARNING | DO NOT use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate the engine's oiling system. |
SPARK TEST
- Disconnect coil wire from distributor(s). Using insulated pliers, hold end of coil wire 1/2" from ground. Crank engine for 1-2 seconds. If spark is not present, go to next step. If spark is present, replace faulty distributor rotor, cap, wires or spark plugs as necessary.
- Turn ignition off. Check for poor electrical connections at ignition coil, ignitor and distributor. If connections are okay, check resistance of coil wire and spark plug wires. Maximum allowable resistance is 25,000 ohms per wire.
- If resistance is okay, turn ignition on. Disconnect ignition coil connector. Check voltage at positive terminal (Black/Orange wire) of ignition coil connector. If battery voltage is not present, check for open or grounded Black/Orange wire or open fuse.
- If battery voltage is present, turn ignition off. Measure ignition coil resistance. See «IGNITION COIL RESISTANCE»(ref-21761-S41706042602001010300000) table. If resistance is not within specification, replace ignition coil.
- If resistance is within specification, check resistance across terminals of the following distributor sensor. See «DISTRIBUTOR SENSOR RESISTANCE»(ref-21761-S02760309622001010300000) table. Distributor pick-up coil. (Scheme 63)
- If resistance is not within specification, replace distributor housing. If resistance is within specification, go to next step.
- Measure air gap of pick-up coils G1, G2 and NE. (Scheme 66) See «DISTRIBUTOR PICK-UP COIL AIR GAP»(ref-21761-S15150240572001010300000) table. If air gap is within specification, go to next step. If air gap is not within specification, replace distributor.
- Check for ignition signal circuit malfunction. See procedure for Code 14 in appropriate «TESTS W/CODES»(ref-21749) article. If ignition signal circuit is okay, replace ignitor.
| Application | Primary | Secondary |
|---|
| GS300 |
| Cold (1) | .21-.33 | 6400-11,100 |
| Hot (2) | .27-.39 | 8200-13,000 |
| (1) Coil temperature of 14-122°F (-10-50°C). (2) Coil temperature of 123-212°F (51-100°C). |
| (1) | Coil temperature of 14-122°F (-10-50°C). |
| (2) | Coil temperature of 123-212°F (51-100°C). |
IGNITION COIL RESISTANCE - Ohms
| Application | Ohms |
|---|
| GS300 (Pick-Up Coils) |
| Cold (1) |
| Between Terminals G1 & "G-" | 125-200 |
| Between Terminals G2 & "G-" | 125-200 |
| Between Terminals NE & "G-" | 155-250 |
| Hot (2) |
| Between Terminals G1 & "G-" | 160-235 |
| Between Terminals G2 & "G-" | 160-235 |
| Between Terminals NE & "G-" | 190-290 |
| (1) Sensor temperature of 14-122°F (-10-50°C). (2) Sensor temperature of 123-212°F (51-100°C). |
| (1) | Sensor temperature of 14-122°F (-10-50°C). |
| (2) | Sensor temperature of 123-212°F (51-100°C). |
DISTRIBUTOR SENSOR RESISTANCE
| Application | In. (mm) |
|---|
| GS300 | .008-.020 (.20-.50) |
| (1) Not adjustable. If gap is incorrect, replace distributor housing. |
| (1) | Not adjustable. If gap is incorrect, replace distributor housing. |
DISTRIBUTOR PICK-UP COIL AIR GAP (1)
Scheme 63
Scheme 64
Scheme 65
Scheme 66
