Engine - Rough Idle/Hesitation/Poor Performance

90pontiac25
Bulletin Number: 91-8-4
Reference Number: 038140
Publish Date: 10/90
Subject: INTERMITTENT ELECTRICAL AND/OR DRIVEABILITY CONDITIONS (REPAIR WIRING)

Models

Affected: 1990-91 FIREBIRD MODELS WITH V-8 ENGINES, 5.0 AND 5.7
Condition:

Intermittent electrical wiring conditions have been found on 1990-91 Firebird models. Some of the symptoms may be poor performance, rough idle, hesitation, engine miss, surging, fuses blowing, and tachometer jumping.

Cause:

The wiring at the right rear of the V-8 engine is congested. The wire harness may chaff, causing intermittent opens or shorts, in three areas: the engine lift hook, the ignition coil bracket, and the lower heater hose clamp.

Correction:

Locate the wire open or short, and repair as required. If the open or short is found at the hose clamp, rotate the clamp so that it does not touch the harness. Secure the wire harness using tie straps so that there is no movement, to avoid any rubbing conditions. Also insure that the wires are routed away from the AIR pipes.

Warranty Information: Use existing labor operations.