ECM - Deceleration to Acceleration Hesitation

91audi01

Group: 24

Number: 91-02

Date: April 30, 1991



Subject: Engine - Minor Load Slap In Drive Line Occurs When
Changing From Deceleration To Acceleration While Driving

Model(s): Coupe Quattro, 90 Quattro M.Y. 1990


Condition:

Deceleration fuel shut-off remains momentarily activated during acceleration.


Production:

Introduction of improved ECU software for MPI engine management system. ECU P/N 893 906 266D

As of: April 1990

VIN: 8A_LA208061
8B_LA13615


Service:

A) For vehicles produced after the above
date/VIN, the new style ECU (893 906 266D) should be used.

B) For vehicles produced before the above
date/VIN, replace ECU 893 906 266B with P/N 893 906 266BA (ECU has improved software to correct shortcoming).


Note:

Replace ECU with zone approval only. Part numbers are for reference only, contact your parts department for verification.