CRUISE CONTROL SURGING VACUUM LEAK/SPEEDOMETER CABLE

MODELS AFFECTED: 1983-1985 ELDORADO AND SEVILLE

Some vehicles may experience a slight surging condition above 45 MPH with cruise control engaged. This condition may be accompanied by a slight accelerator pedal movement. However, the condition may not result in speedometer fuuctuation either with or without digital speedometer head. If this slight surge condition is experienced, the following procedure should be followed.

1. Verify that surging condition exists only while cruise control is engaged.

2. Check the vacuum system for disconnected or leaking hoses.

3. Temporarily secure the speedometer cable to the brake booster and servo mounting bracket with a tie wrap to eliminate cable whip.

4. Test drive vehicle. If the condition is reduced, replace the speedometer cable and case.

NOTE: Before installing replacement speedometer cable, lube the replacement cable and check that it turns freely in the case.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.