Engine - Bucking/Jerking At Steady Cruise Speeds

Article No.
94-23-8

11/14/94

^ BUCKING/JERKING AT STEADY HIGHWAY CRUISE SPEEDS - VEHICLES WITH 1.9L H.O. ENGINE

^ ROUGH RUNNING AT STEADY HIGHWAY CRUISE SPEEDS - VEHICLES WITH 1.9L H.O. ENGINE

FORD:
1986-90 ESCORT

LINCOLN-MERCURY:
1986-87 LYNX

ISSUE:
The vehicle may buck, jerk or run rough at steady highway cruise speeds. This occurs because the vane of the vane air flow meter freezes and/or there is loss of signal between the resistive element and the wiper of the vane air flow meter.

ACTION:
Perform the necessary Diagnostics per Self-Test Codes through the Engine/Emissions Diagnosis Service Manual. Follow the related Pinpoint Tests. If the condition is caused by a failure of the Vane Air Flow Meter, install a Hot/Cold Induction System Service Kit to prevent freezing. Refer to Instruction Sheet # 6526 which is included in the kit for the installation procedure.

NOTE:
REPLACEMENT OF THE VANE AIR FLOW METER (E9FZ-12BS29-A) MAY STILL BE NECESSARY IF THE RESISTIVE ELEMENT AND THE WIPER ARE NON-OPERATIONAL DUE TO CONTAMINATION OF WATER AND ICE.

The Hot/Cold Induction System Service Kit (FOPZ-9K672-A) contains the following components:

^ One (1) Engine Air Cleaner Duct And Valve Assembly

^ One (1) Heat Stove Shroud

^ Two (2) Nuts, M8 X 1.25 Hex Flange Head

^ One (1) Hose Clamp

^ One (1) Air Cleaner Air Temperature Control Sensor

^ One (1) Air Temperature Control Sensor Gasket

^ One (1) 3/16 X 3/16 Spring Nut

^ Two (2) Emission Vacuum Control Connector Assemblies

^ One (1) Intake Manifold Vacuum Outlet Fitting Assembly

^ One (1) Air Cleaner Decal Template

^ One (1) Engine Exhaust Emission Identification Decal

^ One (1) Authorized Modification Decal

^ One (1) Air Cleaner-To-Vane Meter Gasket

^ One (1) Instruction Sheet # 6526

PART NUMBER PART NAME CLASS

FOPZ-9K672-A Hot/Cold Induction System AG
Service Kit
E9FZ-12B529-A Vane Air Flow Meter B

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS:
Eligible Under The Provisions Of Basic Warranty Coverage And Emissions Warranty Coverage

OPERATION DESCRIPTION TIME
942308A Perform Quick Test, 1.1 Hr.
Pinpoint Test And Install
Induction System Service
Kit

DEALER CODING
BASIC PART NO. CONDITION CODE
12B529 08

OASIS CODES: 608600, 610600