Intermittent Surging At Steady Speed
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1988 Ford Ranger, 1988 Ford RV Cutaway, 1988 Ford Pickup, 1988 Ford F-Super Duty, and 1988 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
- Check plug firing voltages, cylinder balance, base ignition timing, spark plug type and MAP and BP sensor (depending on vehicle). See MAP/BP SPECIFICATIONS table.
- On Vane Airflow Meter (VAF) equipped vehicles, check for unmetered air leaks. On all vehicles, check flow of fuel injectors and fuel pressure.
MAP/BP SPECIFICATIONS
| Altitude In Feet | Voltage Output |
|---|---|
| 0 | 1.55-1.63 |
| 1000 | 1.52-1.60 |
| 2000 | 1.49-1.57 |
| 3000 | 1.46-1.54 |
| 4000 | 1.43-1.51 |
| 5000 | 1.40-1.48 |
| 6000 | 1.37-1.45 |
| 7000 | 1.35-1.43 |