Engine Performance - Driveability Service

Group: 25

Number: 93-O3

Date: April 30, 1993

Subject:
Engine Performance

Model(s):
80,90, Engine Code NG from 1987 m.y

This Technical Bulletin lists recommendations and background information regarding engine performance.

Possible driveability related performance behaviors are listed by likelihood in the tables in four categories:

Frequent
Less Frequent
Seldom
Not A Cause

Poor driving performance

Use VAG 1551 Scan Tool to troubleshoot all engine performance complaints. For explanation on how to connect and use VAG 1551 Scan Tool, See Repair Manual, Repair Group D2.

Test conditions:

^ Engine basic setting OK

^ Perform automatic test sequence with VAG 1551, address word 00.

^ Erase DTC memory.

^ Test drive car for at least 5 min. During test drive push accelerator pedal down once all the way and drive car briefly at more than 4000 RPM.

Caution!
Taking measurements while driving diverts attention from the road which can lead to injury or worse. It is difficult to read and record measurements accurately while driving. Always use a second person for this task.

^ Read DTC memory again and repair according to Repair Manual, Repair Groups D2, 25 and 28.

^ If it is necessary to replace parts, print-out DTC memory and attach to the file copy of the repair order

^ Use this information to correct performance problems.

Symptom Chart:

Table 1

Cause Chart 1 - 5:

Table 2 (1 - 5)

Cause Chart 6 - 10:

Table 1 (6 - 10)

Cause Chart 11 - 16:

Table 1 (11 - 16)

Cause Chart 17 - 23:

Table 1 (17 - 23)