626 L4-1998 cc 2.0L SOHC Turbo FE (1986)
Engine Control Module: All Technical Service Bulletins
Emissions - Rough Idle Just After Warm Restart
Category 4
Applicable Model/s 626 TURBO
Subject
EMISSION CONTROL UNIT
Bulletin No. 022/86
Issued
12/18/86
Revised
DESCRIPTION
Fuel tends to vaporize in the distribution pipe due to high under hood temperatures. This vaporizing of the fuel will cause rough engine idle just after
warm re-start.
Emission Control Unit
VIN OF PRODUCTION CHANGE
To eliminate this problem, the emission control unit has been modified to allow higher fuel pressure at lower temperatures. This will help prevent fuel
vaporization in the fuel distribution pipe and reduce rough idle just after warm re-start.
The intake air temperature operating range for the 3-way solenoid valve has been changed from 131~F to 50~F.
During the first 2 minutes after the engine is re-started, vacuum is cut to the pressure regulator and the fuel pressure is increased under the following
conditions.
^
Before Modification:
Coolant temperature is above 158~F and intake air temperature is above 131~F.
^
After Modification:
Coolant temperature is above 158~F and intake air temperature is above 50~F.
PARTS INFORMATION
PART NUMBER
DESCRIPTION
INTERCHANGEABILITY
NEW
OLD
FEH5 18 880C
FEH5 18 880B
Emission Control Unit
NEW --> OLD
