How do you adjust distributor on 92 deville?

Answer 1

This tutorial assumes that you know how to use timing light.

To adjust the basic timing on any Cadillac 4.9 by rotating the distributor:

1) When the Engine is at normal operating temp, A/C off, Place Transmission in "PARK".

2) With the ignition "OFF" remove air cleaner upper housing and duct to throttle body.

3) Jumper pins A&B at the ALDL plug A/C panel should display "SET TIMING MODE".

4) Start engine, let it run at idle (less than 800 RPM)

5) Base timing should be set at 10° BTDC. If you need to adjust this, there is one 15 mm nut holding down the base of the distributor that must be loosened, it is very hard to get to without the special wrench (Kent-Moore #J29791 or Snap-On #S6134).

6) Once the timing is set, retighten the distributor hold down nut and recheck the timing.

7) Remove jumper at the ALDL plug.

8) Re-install air cleaner upper housing and duct to throttle body. All done!