Engine - Hesitation On Acceleration/Surge While Driving: Overview

91ford23

Article No. 91-16-7
08/07/91


^ HESITATION - 1.3L - NOT ENOUGH DISTRIBUTOR ADVANCE - CARBURETED ENGINES BUILT BEFORE 11/15/88

^ SURGE - 1.3L - NOT ENOUGH DISTRIBUTOR ADVANCE - CARBURETED ENGINES BUILT BEFORE 11/15/88


FORD: 1988-89 FESTIVA


This TSB article is being republished in its entirety to update the instructions for filling out the authorized modification decal. All prior TSB'S for this fix are superseded by this publication.

ISSUE: Hesitation during acceleration or a surge while driving at a steady speed may be caused by insufficient distributor spark advance, excessive EGR flow and fuel getting into the distributor vacuum advance manifold port.

ACTION: Modify the distributor and EGR system by installing the applicable special service kits identified in the parts block. Refer to the service procedure that applies to the vehicle application. Check to see if the procedure outlined in TSB 88-10-8 has been done for 1988 vehicles.

FOR THOSE VEHICLES THAT HAVE BEEN RETURNED FOR SERVICE WITH THE EGR NONFUNCTIONAL AFTER APPLICATION OF A PRIOR VERSION OF THIS TSB (TSB'S 88-10-8, 89-25-5, 90-2-3), UPDATE THE MODIFICATION DECAL WITH
THE FOLLOWING NOTE: PER TSB 91-16-7 THE EGR WILL NO LONGER FUNCTION AND EGR GAS WILL NOT FLOW.


NOTE: CALIFORNIA VEHICLES HAVE AN EGR VALVE POSITION (EVP) SENSOR MOUNTED TO THE TOP OF THE EGR VALVE AND THE VEHICLE EMISSION CERTIFICATION INFORMATION LABEL IS NOTED FOR CALIFORNIA EMISSIONS CERTIFICATION.

NOTE: VERIFY THE BUILD DATE OF THE VEHICLE BY REFERRING TO THE BUILD DATE STAMPED ON THE VEHICLE CERTIFICATION LABEL ON THE DRIVER'S SIDE "B" PILLAR FACE. ALL 1988 AND 1989 CARBURETED UNITS BUILT BEFORE NOVEMBER 15, 1988 ARE AFFECTED.