INTRODUCTION
Note. Introduction information not applicable.
* PLEASE READ FIRST *
Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.
VALVE CLEARANCE
Note. Hydraulic lifters are used. No adjustments are required.
IGNITION TIMING
Ignition timing is controlled by ECM and is not adjustable. Value given in IGNITION TIMING is for verification purpose only. (Scheme 1)
| Application | Degrees @ RPM | |
|---|---|---|
| 911 Carrera & 911 Carrera 4 | ||
| Automatic Transmission | TDC +/- 3 @ 710-790 | |
| Manual Transmission | TDC +/- 3 @ 760-840 | |
IGNITION TIMING
Scheme 1
COLD (FAST) IDLE
Fast idle speed is controlled by ECM and is not adjustable.
IDLE SPEED & MIXTURE
Note. After disconnecting battery or ECM, engine MUST be run at idle for at least 10 minutes before idle speed and CO level can be rechecked.
Idle speed and mixture are controlled by ECM and are not adjustable. Values given in IDLE SPEED & CO LEVEL is for verification purpose only.
| Application | (1) Idle RPM | (2) CO Level | |
|---|---|---|---|
| 911 Carrera & 911 Carrera 4 | |||
| Automatic Transmission | 710-790 | 0.4-1.2 % | |
| Manual Transmission | 760-840 | 0.4-1.2 % | |
| (1) Idle RPM is controlled by ECM and is not adjustable. (2) With oxygen sensor connected. Measurement is taken in front of catalytic converter. Hydrocarbon level should be equal to or less than 300 parts per million (ppm). | |||
| (1) | Idle RPM is controlled by ECM and is not adjustable. |
| (2) | With oxygen sensor connected. Measurement is taken in front of catalytic converter. Hydrocarbon level should be equal to or less than 300 parts per million (ppm). |
IDLE SPEED & CO LEVEL
Poses Online
See also:
• IGNITION TIMING