If you over or under advanced the timing that's all it would take. Been there done that. Did you loosen distributor cap? Make sure it is seated. Did you replace any wires? Check the firing order if so. Retrace your work, but chances are your timing was just bumped to far so try this: have someone crank motor while you slowly turn distributor and it should start if nothing else was changed. Good luck. I hope this helps you, Mark
start by checking fuel delivery,if you do have fuel delivery proceed by checking the timing setting.
the rotation is counter clock wise and the firing order is 1-3-2.
5 degrees BTDC. remember to set the idle to 800rpm for automatic transmission and plug the vacuum advance ose before setting the timing.
6 degrees before top dead center.
12 degrees before top dead center.
setting timing on a f150 4.9 6cyl
do you mean firing order or timing? firing order is 1,3,4,2 timing is 16 degrees =/- 2 btdc @ 750 rpm =/- 50
Sounds like your timing chain might have jumped a notch. Timing is set by rotating the distributor. There is a nut underneath the distributor that locks it down. Timing mark is on the harmonic balancer, sorry I don't have the setting handy. I would start by checking the timing with a timing light. VBdenny
1243 ign timing between 6 & 11 deg before TDC
Should be 12 degrees before top dead center
Should be 12 degrees before top dead center
It is 6 degrees before top dead center.