Pressure Test
- Start engine and warm to normal operating temperature. Release fuel pressure by removing fuel pump fuse (fuel pump relay on 300ZX). Restart engine. After engine stalls, crank engine 2-3 times to completely release fuel pressure.
- On all models, disconnect distributor center cable (crank angle sensor on 300ZX). Check compression pressure with all spark plugs removed, throttle valve wide open and engine at specified cranking speed.
- Crank engine at least 6 revolutions to determine engine compression. Compression reading should be within specification. See ENGINE COMPRESSION TABLE. After servicing engine, turn ignition off and reconnect disconnected components. Erase memory Code 22 (if necessary).
ENGINE COMPRESSION
| Model | Standard psi (kg/cm2 ) | Minimum psi (kg/cm2 ) | Minimum RPM | |
|---|---|---|---|---|
| Maxima | 173 (12.0) | 128 (9.0) | 300 | |
| NX & Sentra | ||||
| 1.6L | 192 (13.5) | 164 (11.5) | 350 | |
| 2.0L | 178 (12.5) | 149 (10.5) | 300 | |
| Pathfinder & Pickup | ||||
| 4-Cyl. | 192 (13.5) | 142 (10.0) | 300 | |
| V6 | 173 (12.0) | 128 (9.0) | 300 | |
| Stanza | 175 (12.3) | 146 (10.3) | 250 | |
| 240SX | 179 (12.6) | 151 (10.6) | 300 | |
| 300ZX | ||||
| Non-Turbo | 186 (13.1) | 142 (10.0) | 300 | |
| Turbo | 173 (12.0) | 128 (9.0) | 300 | |