Van Wagon 2WD L4-2237cc 2.2L (4Y-EC) (1987)
Technical Service Bulletin # ENG020
Date: 880527
Fuel - Poor Idle/Hard Starting After Hot Dead Soak
REFERENCE:
ENGINE
NUMBER:
020
DATE:
05-27-88
MODEL:
YR '86, '87, '88
TITLE Poor Idle/Hard starting After Hot Dead Soak
A field fix procedure is being provided for YR models that may exhibit the following condition:
^
Rough idle and/or hard starting after the vehicle has reached normal operating temperature then is turned off and allowed to hot soak for 15 to
30 minutes before being restarting.
High ambient temperatures and/or poor quality fuel contribute to these conditions.
General Information On Field Fix
The following parts have been made available:
1)
Regulator kit (P/N 04239-73010) to provide higher fuel pressure. Used on all 86 and 87 vans.
2)
Valve kit (P/N 04239-73020) to provide fuel pressure up control. Used on 86, 87, and 88 vans without A/C.
3)
Water temperature sensor (TSW) (P/N 89428-26020) to reduce its activation temperature. Used alone for 88 vans.
HOW IT WORKS
The main objective of this fix is to increase fuel pressure during the fuel pressure up period on hot restart, and expand the engine temperature operating
range for the pressure up system. This was accomplished by the following methods:
1)
Increase available fuel pressure by use of a new fuel pressure regulator:
Old Spec
New Spec
2.55 Kg/sq.cm. (36 Psi)
2.90 Kg/sq.cm. (41 Psi)
2)
Reduce the temperature where the TSW switch activates from 110~C to 60~C.
3)
Provide a fuel pressure up system for vehicles without A/C. The valve kit provides this by preventing manifold vacuum from acting on the
fuel pressure regulator after a hot restart for a period of approximately two minutes.
NOTE:
Parts application on 88' vans is different because they are equipped with the 2.90 Kg/sq.cm. (41 Psi) fuel pressure regulator from the factory.
Use the following application chart carefully.