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5.7 Engine Vacuum is not used for any part of the speed control system if equipped with a 5.7L V-8 engine. DIAGNOSIS AND TESTING - ROAD TEST Perform a vehicle road test to verify reports of speed control system malfunction. The road test should include atten- Flutter in the speedometer indicates a problem which might cause surging in the speed control system. The cause If a road test verifies a system problem and the speedometer operates properly, check for: • A Diagnostic Trouble Code (DTC). If a DTC exists, conduct tests per the Powertrain Diagnostic Procedures • A misadjusted brake (stop) lamp switch. This could also cause an intermittent problem. • Loose, damaged or corroded electrical connections at the servo (if used). Corrosion should be removed from • Leaking vacuum reservoir (if used). • Loose or leaking vacuum hoses or connections (if used). • Defective one-way vacuum check valve (if used). • Secure attachment of both ends of the speed control servo cable (if used). • Smooth operation of throttle linkage (if used) and throttle body air valve. • Failed speed control servo (if used). Do the servo vacuum test. CAUTION: When test probing for voltage or continuity at electrical connectors, care must be taken not to SPECIFICATIONS TORQUE - SPEED CONTROL DESCRIPTION N-m Ft. Lbs. In. Lbs. Servo-to-Cross Support Mounting Bolt - - 105 Speed Control Switch Mounting Screws 1.7 - 15 CABLE-SPEED CONTROL DESCRIPTION The speed control servo cable is connected between the speed control vacuum servo diaphragm and the throttle A speed control servo cable is not used if equipped with a 5.7L engine. OPERATION This cable causes the throttle control linkage to open or close the throttle valve in response to movement of the 8P - 4 SPEED CONTROL WK |