well.....
The overhead cam is harder to get too than the pushrod. But it is NOT impossible. the thing I would be more worried about is if it BREAKS when you are trying to remove it.
The best thing to so is to see if you can feel around for it. Just get on the PASSENGER SIDE, and try to get your arm down, and around the back. In the case of the DOHC, you might be able to get it from under the car. Just jack it up, support it, then try to get your arm between the alt, and tranny.
To be honest, I am rebuilding a twin cam for my 1995 Cutlass Supreme, and I think I would rather just pull the engine to do it.
Kinda hard to see, but on my 1995 twin cam, there are 2 sensors on the back. I circled the CPS. the other one on the right (looking at pic), is the KNOCK sensor.
