ENGINE MECHANICAL
Before performing any on-vehicle adjustments to fuel or ignition system, ensure engine mechanical condition is okay.
VALVE CLEARANCE
Note. All models are equipped with hydraulic lash adjusters. No adjustment is required.
IGNITION TIMING
- Ensure engine is at normal operating temperature and idle speed is correct. Set transaxle in Neutral (M/T) or Park (A/T) position. Connect timing light to No. 1 spark plug wire.
- Observe timing marks, located on crankshaft pulley. See IGNITION TIMING SPECIFICATIONS table. If timing is not as specified, check self-diagnostic system for Diagnostic Trouble Codes (DTCs). Repair as necessary. See appropriate «TESTS W/CODES»(ref-26249) article.
| Application | Auto. Trans. | Man. Trans. |
|---|---|---|
| Legacy | 12-28 @ 700 | 6-22 @ 700 |
IGNITION TIMING (Degrees BTDC @ RPM)
IDLE SPEED & MIXTURE
Note. Idle mixture is ECM controlled. Adjustment is not required.
COLD (FAST) IDLE
Note. Fast idle is ECM controlled. Adjustment is not required.
IDLE SPEED
- Ensure air filter is clean, vacuum hoses are properly routed, and timing is correct. Warm engine to operating temperature. Connect inductive pick-up tachometer to No. 1 spark plug wire. NOTE: Because spark plugs No. 1 and 2 fire simultaneously, some tachometers may register twice actual engine speed.
- Check idle speed with all accessories off, then with all accessories on. See IDLE SPEED SPECIFICATIONS table. If idle speed is not as specified, check self-diagnostic system for DTC(s). Repair as necessary. See «TESTS W/CODES»(ref-26249) article.
| Application | RPM |
|---|---|
| With Accessories Off | 600-800 |
| With Accessories On | 800-900 |
IDLE SPEED SPECIFICATIONS
THROTTLE POSITION (TP) SENSOR
Note. All testing procedures are performed with engine at normal operating temperature. For further TP sensor diagnosis, see appropriate TESTS W/CODES article.
With engine off, unplug TP sensor harness connector. Check and record resistance between terminals No. 2 and 3 with throttle fully closed. (Scheme 1) Check and record resistance between terminals No. 2 and 4 with throttle fully closed, then with throttle fully open. If readings are not as specified, replace TP sensor. See TP SENSOR SPECIFICATIONS table.
| Throttle Position & Terminal No. | Specification | |
|---|---|---|
| Terminals No. 2 & 3 | 12,000 Ohms | |
| Terminals No. 2 & 4 Ohms | ||
| Throttle Fully Closed | 10,000-12,000 Ohms | |
| Throttle Fully Open | 3000-5000 Ohms | |
TP SENSOR SPECIFICATIONS
