Thunderbird V6-232 3.8L (1982)
Intake Manifold: All Technical Service Bulletins
Engine - Rough Idle Condition
Article No. 86-13-16
IDLE - ROUGH (3.8L)
FORD 1982-83 THUNDERBIRD, LTD, MUSTANG
LINCOLN-MERCURY 1982-83 COUGAR, MARQUIS, CAPRI
LIGHT TRUCK 1982-83 F SERIES
This article is being re-published to include 1982 and 1983 F Series trucks and to provide the new service part number for the intake manifold.
Rough idle concerns may be caused by the crossover heat tubes (located in intake manifold) "backing out of position" and allowing unmetered exhaust
gas to leak into the intake manifold. Installation of a replacement manifold will correct this concern.
To check for this condition:
1.
Perform an RPM drop test by removing and reconnecting the spark plug wires.
2.
RPM loss will normally be less on the right head if the crossover heat tubes are loose or "backed out" of position.
Figure 9
3.
Loose crossover heat tubes can be confirmed by removing the carburetor/carburetor spacer and visually inspecting the tubes as shown in Figure 9.
