900 L4-1985cc 2.0L SOHC (1988)
Valve Clearance: Technical Service Bulletins
Fuel System - Driveability Improvement
CATEGORY
Engine
SECTION
2
PAGE
22
ISSUE
11/92-0270
CODE
240
Subject:
Driveability Improvement: CIS With Heated Oxygen Sensor
Application:
1988 900 Model (B201 Engine) Only
Supersedes 08/90-0018
A service procedure has been developed which improves the driveability of 1988 900 models (equipped with the B201 engine and Continuous Injection
System) during the initial warm-up period. This service procedure entails making maximum use of the tuning specifications, installing a set of new
injection valves with Viton seats, and installation of new fuel injection components.
Note
Before taking any steps to install new parts, it is imperative that the basic tuning settings of the engine are optimized to the maximum permitted
tolerances. Ensure that there are no leaks in the injection system, the throttle housing is clean, the sensor plate height is adjusted properly, and that all
fuel pressures are correct. If fuel pressure readings indicate a bad warm-up regulator, it should be replaced with a new one.
Parts Required:
Viton Injector (qty 4)
P/N 78 56 354
Warm-up Regulator
P/N 75 15 554
(P/N 02 45 159 has been discontinued)
Auxiliary Air Valve
P/N 91 14 869*
Modification of existing vacuum impulse switch*
*
This component/change is certified only for the 1988 900 with B201 engine.
Tune-Up Specifications
Correct tune-up specifications are essential:
^
Timing: 21~ BTDC at 2000 rpm
^
Spark Plug Gap: 0.6 mm (0.024 in.)
^
Intake Valve Clearance: 0.28 mm (0.011 in.)
^
Exhaust Valve Clearance: 0.48 mm (0.019 in.)
^
Pulse Ratio: (engine at normal operating temperature) 45%
^
Idle Speed: 875 +/- 75
Action:
