DTC'S P1633, P1631, P0173 UNSTABLE IDLE/STALLING

Applicable Models

0003500 Dealer Repair Information

                                                                        
Customer may experience one or more of the following:                   
                                                                        
 * Charge light on                                                      
 * DTC P0173 (caused by excessive noise in O2 sensor circuit)           
 * DTC P1631                                                            
 * DTC P1633                                                            
 * Unstable Idle (Surging) under electical loads (cooling fans, rear    
   defroster, headlamps,ect.)                                           
 * Stalling coming to a stop or at a stop, due to the unstable idle.    
                                                                        
Condition may be caused by excessive voltage spikes and/or noise        
produced within the alternators that had an incorrectly soldered        
condencer and were installed in vehicles produced in March,             
April and May of 1999.                                                  
                                                                        
If you incounter a vehicle with this concern replace the alternator     
and verify repair.