ENGINE MECHANICAL
Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.
VALVE CLEARANCE
Hydraulic valve lash adjusters are used. Valve clearance adjustment is not required.
IGNITION TIMING - V6
Note. VIN L ignition timing is not adjustable.
VIN B
- Ensure engine is at operating temperature, all accessories are off, and transmission is in Park or Neutral. Set parking brake. Ensure idle speed is correct.
- Connect timing light to No. 1 spark plug wire. Use jumper wire to connect Data Link Connector (DLC) STI terminal to GND terminal. (Scheme 5) Start engine. Check base ignition timing. See V6 BASE IGNITION TIMING table.
- If timing is not to specification, loosen distributor hold-down bolt. Adjust timing as necessary. Turn engine off. Remove jumper wire from DLC terminals. Start engine. Ensure advance mechanism functions when engine speed is increased.
Scheme 5
| Application | Location |
|---|---|
| 2.5L | On Distributor |
IGNITION CONTROL MODULE (ICM) LOCATION
| Application | Degrees BTDC @ Idle |
|---|---|
| VIN B | (1) 9-11 |
| VIN L | (2) (3) 8-12 |
| (1) With STI terminal of DLC grounded. (2) Disconnect single in-line SPOUT connector, or remove shorting bar from double-wire SPOUT connector. (3) Timing is not adjustable. | |
| (1) | With STI terminal of DLC grounded. |
| (2) | Disconnect single in-line SPOUT connector, or remove shorting bar from double-wire SPOUT connector. |
| (3) | Timing is not adjustable. |
V6 BASE IGNITION TIMING
IDLE SPEED
Note. VIN L idle speed is not adjustable.
VIN L
Note. Information for TP sensor adjustment is not available.
Ensure TP sensor is properly installed. See THROTTLE POSITION (TP) SENSOR under FUEL SYSTEM in appropriate article
- For Probe, see «REMOVE/INSTALL/OVERHAUL - 2.5L»(ref-23139)
- For Contour & Mystique, see «REMOVE/INSTALL/OVERHAUL - 2.5L»(ref-23140)
If additional test procedures are required, see appropriate article in the ENGINE PERFORMANCE section
- For Probe, see «TESTS W/CODES - EEC (2.5L)»(ref-23095)
- For Contour & Mystique, see «TESTS W/CODES - EEC-IV (2.5L)»(ref-23138)
- Turn ignition off. Disconnect PCM wiring harness connector. Inspect terminals for damage and repair if necessary. Connect Breakout Box (014-00322) to PCM. Turn ignition on. Measure voltage between test pin No. 47 and ground.
- Voltage should be 0.1-1.1 volts with throttle fully closed and 3.1-4.4 volts with throttle fully open. If voltage is not within specification, loosen TP sensor screws. Adjust TP sensor until voltage is within specification.