1991 f150 timing

[pop826]

What To Disconect To Set Timing On 4.9 Motor

[mightymouse466]

You don't disconnect anything. Get yourself a timing light. Connect the power clips to your battery and the other clip over your #1 ignition wire. Check timing on harmonic balancer. If it need adjusted loosen the distributor hold down clamp and very slowly turn distributor one way or the other. Tighten clamp.

[taillight]

You need to set the computer into base timing. Pull the green plug near the distributor. Then set the timing at idle speed.