GM-GMC: 1992 Bucik Lesabre -cam sensor, labscope, cam sensor

Question
1992 buck Lesabre. intermitent service engine light. The car runs smooth, just got used, & my wife noticed lurch, twice in past 2 weeks
Could this be Timing chain Slipping
Get code 41 - (Cam sensor or Cylinder select error-MEM-CAL or ECM PRoblem)
Washed motor and light not on for 2 days
I think just bad conection except for the lurch,
Wish it would happen when I'm driving for first hand experiance, could the lurch be motor mount or motor shock loose or worn

Answer
Hi,  

These cars have problems with the magnet falling off the cam gear it is just glued on and will often start to seperate. usually this results in a "Hard code 41" and the only drivability problem would be a slightly longer crank time and the injectors will not fire sequentially anymore. It could also possible sugjest a timing chain that is sloppy, if the chain actually slipped it would probably strip of gear teeth and it would not be an intermitant problem. I sugjest that you start by having the cam sensor signal tested or if you have a LabScope yourself Test the waveform generated by the sensor. Lokk for drop outs or a low amp out-put signal. Hope this helps