'91 olds 98 won't start

[ythraccm]

Sorry it took so long to get back. The article was helpful, thanks.
Ended up changing the sensor and harmonic balancer since the one that was installed was made in China and the runout on the reluctor rings was about .040", I tried to recenter the rings but could only get .024" at best and could not keep it from rubbing on one side or the other. The new one was a Pioneer balncer built in Australia. It had slightly thicker rings on it so the clearances were a bit tighter around the sensor and it had a .010 runout on them. The .020 feeler gauge trick wouldn't work because of the clearances involve so I centered the sensor so it would not touch on either side of the rings. Of course the new balancer slots were smaller so I had to grind the puller jaws to get it to fit so I sould remove the balancer and reinstall the shield which was removed to set the clearances. (Definately need to avoid going off road with this vehicle as something could get to this set up like a rock or twig and mess it up.) Anyway so far so good the vehicle still cranks up and behaves pretty much normally.
Still may have that slight shudder around 58 -64 MPH when accelerating. I think we will start a new thread for that one.

[ythraccm]

2 final things to wrap up this thread.
1 is the harmonic balancer I got from carquest made in Australia under the name pioneer had a powerful little rectangular magnet stuck down beween the reluctor rings. Fortunately I spotted it before installing it otherwise it would have lodged on the crank pickup and probably destroyed it. Don't know if it was intentionally put there or not.
2. The shudder I was having further showed up the next morning on a cold start as a cylinder not firing. #5 had a cracked plug. Changing that out corrected the shudder as well.
Thanks for the help and I hope this helps somebody else .
runaround