Engine - Run-On/Surge/Flat Spot

88toyota14

REFERENCE ENGINE
NUMBER 017 (revised)
DATE 11-18-88
MODEL EL3#

TITLE 3E ENGINE DRIVEABILITY (Revised - Discard all previous versions)

This TSB will provide the information necessary to correct the following driveability conditions that may be experienced on 1987 and early production 1988 Tercels.

1. Engine Run-On
2. Engine Surge/Flat Spot

The following production changes have been made to eliminate conditions 1 and 2 and improve driveability.




CONDITION PRODUCTION CHANGE

1. Engine Run-On ^ Throttle closing system added to the carburetor assembly.

2. Surge/Flat Spot ^ Carburetor metering needle design changed.

^ Cold mixture heater temperature switch operating range extended from 122~F (50~C) to 131~F (55~C).

FIELD FIX INFORMATION:

To correct engine run-on and/or surge/flat spot conditions on 1987 and early 1988 production vehicles, install the necessary components according to production date and frame number information as shown in the following charts.

^ Chart 1: Components needed by production range/model.

^ Chart 2: Part number information.


CHART 1: COMPONENTS REQUIRED

Production Date Frame Number Components Required

A 8608 - 8708 Start of production to 1. Carburetor Assembly.
JT2EL3###H0154057 2. Temperature switch for
cold mixture heater.
3. Engine room sub-wire harness.

B 8708 - 8710 JT2EL3###J0154058 1. Carburetor Assembly.
to 2. Temperature switch for
JT2EL3###J0179719 cold mixture heater.




NOTE: 1987 Tercels require installation of a new engine room subwire harness to adapt the new throttle closing system to the vehicle's electrical system. (see illustration at right).

1. Brown (Female) - To throttle solenoid.

2. Green (Female) - To Engine Main Harness

3. Green (Male) - To Carburetor (fuel cut solenoid & throttle switch)

4. Ground wire - To VSV bracket



CHART 2: PART NUMBER INFORMATION
INTERCHANGEABILITY

New part numbers are interchangeable with previous part numbers when all required components as listed in chart 1 and 2 are installed.


NOTE:

- Check all carburetor adjustments and reset to specifications as needed.

- Manual transmission and automatic transmission carburetors have different enrichment calibration and are not interchangeable.