Wagoneer L6-242 4.0L VIN L FI (1989)
Powertrain Control Module: All Technical Service Bulletins
ECU - Driveway Die Outs With A Cold Engine
Models
1987-1990 MJ & XJ Bodies With 4.0 Liter Engine
Subject
Start and Stall and Driveway DieOut
Index
DRIVEABILITY
Date
December 29, 1989
No.
18-54-89 REVISION A
P-0005 (C18-24-9)
BODY CODE LEGEND
MJ - COMANCHE XJ - CHEROKEE
NOTE:
THIS TECHNICAL SERVICE BULLETIN SUPERCEDES TSB 18-54-89 WHICH SHOULD BE REMOVED FROM YOUR FILES.
SYMPTOM/CONDITION
Driveway die-outs with a cold engine, particularly in warm ambient temperatures.
DIAGNOSIS
Verify that TSB 18-51-88 or TSB 18-57-89 (crank position sensor and patch harness) has been properly performed on the vehicles to which they apply.
Make sure the fuel management system is operating correctly by using the DRB II in the state display and systems test. Any electronic engine control
problems detected by the DRB II must be corrected before performing this TSB.
PARTS REQUIRED
1
ECU (Automatic Transmission)
PN 53007842
1
ECU (Manual Transmission)
PN 53007843
1
Mopar Choke and Linkage Cleaner
PN 4549619
REPAIR PROCEDURE
This repair procedure involves replacing the ECU and cleaning the throttle body.
1.
Install the new service replacement ECU.
2.
With the engine off, remove the clean air tube from the throttle body.
3.
Open the throttle and spray the bottom edge of the throttle plate and the throttle body bore with Mopar Choke and Linkage Cleaner, PN 4549619,
(use cleaner sparingly).
NOTE:
USE ONLY THE RECOMMENDED CLEANER TO PREVENT DAMAGE TO THE THROTTLE SHAFT SEALS.
4.
Using a soft bristle brush such as a tooth brush, work the cleaner into the stubborn deposits on the throttle blade and the throttle body bore where
the throttle blade is positioned at idle. Allow the cleaner to soak for three (3) minutes.
5.
Start the engine and let idle. Spray the cleaner sparingly at the throttle plate edge and throttle bore contact area.
6.
Operate the engine at 1500 RPM for one minute to clear the intake manifold of cleaner. Allow the engine to idle until it reaches normal operating
temperature. Then shut the engine off.
