| 2.5L (151") 4-Cyl. |
| Ignition Timing |
| Auto. Trans. |
8° BTDC at 650 RPM |
| Man. Trans. |
8° BTDC at 900 RPM |
| Spark Plugs |
| Type |
AC Delco R44TSX |
| Gap |
.060" (1.5 mm) |
| Fuel System (Make & Type) |
General Motors Model 300 TBI |
| Hot Idle |
| Auto. Trans. |
475-525 |
| Man. Trans. |
750-800 |
| Fast Idle (Trans. In Neutral) |
Non-Adjustable |
| 2.8L (173") V6 |
| Ignition Timing |
| Auto. Trans. |
10° BTDC at 600 RPM |
| Man. Trans. |
10° BTDC at 800 RPM |
| Spark Plugs |
| Type |
| Standard (Vins X & 1) |
AC Delco R43CTS |
| High Output (Vins L & Z) |
AC Delco R42CTS |
| Gap |
.045" (1.1mm) |
| Fuel System (Make & Type) |
Rochester E2SE |
| Hot Idle |
| Auto. Trans. |
| Vin L & Z |
725/850 |
| Vin X & 1 |
600/750 |
| Man. Trans. |
| Vin L & Z |
800/1100 |
| Vin X |
775/1100 |
| Vin 1 |
800/1000 |
| Fast Idle (Transmission In Neutral) |
| Auto. Trans. |
| Vin L & Z |
2700 RPM |
| Vin X & 1 |
2500 RPM |
| Man. Trans. |
| Vin L, Z & 1 |
2600 RPM |
| Vin X |
2500 RPM |
| Cam Step Adjustment (All Models) |
High |
| 5.0L (305") V8 |
| Ignition Timing |
| Carbureted |
| Auto. Trans. |
6° BTDC at 500 RPM |
| Man. Trans. |
6° BTDC at 700 RPM |
| Fuel Injected |
6° BTDC at 475 RPM |
| Spark Plugs |
| Type |
AC Delco R45TS |
| Gap |
.045" (1.1 mm) |
| Fuel System (Make & Type) |
| Carbureted |
Rochester E4ME |
| Fuel Injected |
GM Model 400 TBI |
| Hot Idle |
| Carbureted |
| Auto. Trans. |
500/650 |
| Man. Trans. |
700/800 |
| Fuel Injected |
475 |
| Fast Idle (Transmission In Neutral) |
| Carbureted |
| Auto. Trans. |
2200 RPM |
| Man. Trans. |
1800 RPM |
| Fuel Injected |
Non-Adjustable |
| Cam Step (Auto. Trans .& Man. Trans) |
High |