Ignition - Engine Miss, Roughness

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Bulletin No.: T-92-53
File in Group: 6
Number: 18
Corp. Ref. No.: 216102
Date: Feb. 1992


SUBJECT: ENGINE MISS ROUGHNESS

MODELS AFFECTED: 1991 DE VILLES AND FLEETWOODS


Some 1991 DeVilles and Fleetwoods built between VIN 228800 and 229200 may experience a condition of an engine miss roughness.

This condition may be caused by abrasion of the number 2 and 4 spark plug wires. The abrasion may be caused by contact between the nylon mesh that covers the heater hose and an unshielded plug wire.

To identify and correct this condition use the following procedure:

1. Inspect spark plug wire numbers 2 and 4 for any signs of abrasion. Replace any abraded wires.

2. Order P/N 12125347, convoluted conduit, for installation on the number 2 and 4 spark plug wires. It is packaged in a 15' roll.

3. Install a 105 mm length of convoluted conduit, P/N 12125347, onto the number 4 spark plug wire. It should completely cover the wire from the spark plug boot to the spark plug wire retainer.

4. Install a 145 mm length of convoluted conduit, P/N 12125347, onto the number 2 spark plug wire. It should completely cover the wire from the spark plug boot to the spark plug wire retainer.

Parts are currently available from GMSPO.

For warranty purposes use Labor Operation T6585 at .6 hour.