Engine - Rough Idling/Black Smoke/Poor Fuel Economy
86ford01Article No. 86-25-9
IDLE - ROUGH - PLUGGED MAP VACUUM LINE
LOADING - BLACK SMOKE PLUGGED MAP VACUUM LINE
FUEL ECONOMY - POOR - PLUGGED MAP VACUUM LINE
FORD 1985-86 TEMPO
LINCOLN-MERCURY 1985-86 TOPAZ
Vehicles that exhibit rough idling, black smoke or poor fuel economy may have a plugged manifold absolute pressure sensor (MAP) vacuum hose. The plugged vacuum hose is caused by fuel entering and reacting with the coating in the MAP that turns into a gel plugging the hose. Check for this condition (and install a new MAP bracket, manifold vacuum fitting and hose) using the following procedure.
1. Unplug vacuum hose at the MAP sensor and inspect for gel plugging the hose. If the gel is present, remove the hose. Do not reuse old hose. Replace with a new hose.
NOTE: Do not replace MAP sensor.
Figure 17:
2. Install a new MAP sensor bracket (E63Z-9G476-A) and new manifold vacuum fitting (E73Z-9A474-B). Torque the vacuum fitting to 6-10 lbs.ft. (8-14 N-m) and position horizontally to ground, Figure 17.
3. Install new vacuum hose.
PART NUMBER PART NAME CLASS
E73Z-9A474-B Manifold Vacuum Fitting C
E63Z-9G476-A Bracket, Map Sensor C
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP9479C86
TIME: 0.4 Hr. DLR. CODING: Basic Part No. 9F479 - Code: 55