Injection Timing: Checking
- Engine must be at normal operating temperature. Place transmission selector lever in "P". Remove air cleaner and install Cover (J-26996-1). Remove MAP sensor retainer. Disconnect EGR valve hose.
- Clean engine probe holder (RPM counter) and crankshaft balancer rim. Clean lens on both sides of glow plug probe. Clean lens in the photo-electric pick-up.
- Use a dull toothpick to scrape the carbon from the combustion chamber side of glow plug probe. Retarded readings will result if probe is not clean.
- Install RPM probe into crankshaft RPM counter (probe holder). Remove glow plug from No. 3 cylinder on a V8 or No. 1 on a V6. Install glow plug probe in glow plug opening. Tighten probe to 8 ft. lbs. (11 N.m).
- On V8 engine, set timing meter offset selector to B (99.5). On V6 engine, set selector to A (20). Connect battery leads. Unplug alternator 2-lead connector.
- If alternator lead is difficult to remove, remove gauge fuse when engine is not running. Start engine. Check injection timing. See Injection Pump Timing Specifications.
INJECTION PUMP TIMING SPECIFICATIONS
| Application | Degrees ATDC @ RPM | |
|---|---|---|
| V6 | ||
| "A" Series | 6@1300 | |
| "G" Series | 5@1300 | |
| V8 | 4@1250 | |
CAUTION:
Anything that affects fuel pressure to the injection pump will change timing. If pump timing is adjusted, and later fuel system is found to be restricted, timing may be incorrect.