Corolla Wagon L4-1587cc 1.6L DOHC (4A-F) (1987)
Technical Service Bulletin # ENG001
Date: 870605
Engine - Hesitation During Engine Warm Up
REFERENCE:
ENGINE
NUMBER:
001
DATE:
06-05-87
MODEL:
AE (FF) M/T 1985-1987
TITLE 4A-LC ENGINE HESITATION (FEDERAL SPECIFICATIONS) M/T
For vehicles with automatic transmission see Bulletin 030 Engine Volume VIII.
These procedures should only be used for complaints of hesitation DURING ENGINE WARM-UP. It is not intended for cold start or warm engine
driveability improvements.
To reduce engine hesitation on light acceleration from a stop or at low speed, a 0.9 mm restrictor has been inserted into the "R" port vacuum line of the
EGR system, and the distributor advance characteristics have been changed.
Production Effective, Part Number & Field Fix Procedure
PRODUCTION EFFECTIVE:
From Engine No.
Production Date
4A-0690330
March, 1986
-3134205
March, 1986
-6657014
March, 1986
PART NUMBER INFORMATION:
Previous Part Number
New Part Number
Part Name
*
---
90925-04034
Restrictor
**19030-16081
19030-16082
Distributor Assy
*For replacement parts only
**Parts are not interchangeable
FIELD FIX PROCEDURE (FOR VEHICLES PRODUCED PRIOR TO MARCH 1986)
1.
Install the restrictor in the vacuum line connecting the "R" port on the EGR vacuum modulator to the EGR "R" port on the carburetor. (See page
15 for part number information.)
2.
Reset ignition timing to 3~ BTDC (with vacuum advance disconnected and plugged). Distributor replacement is not necessary. The distributor
change is for production only.
NOTE: