2 replies to this topic

[Herr Mustang]

After driving the f150 for an hour or so I parked in the driveway, came out an hour later and it won't start. Cranks easily and occasionaly fire for a second but won't run. It will run on ether. Fuel pump can b heard priming. And pressure runs around 35 psi at the rail and goes up slightly when attempting to start. I'm at a loss what to try next. Suggestions?

[78oldscutlass455]

Have you checked for spark intensity? Will the spark from the ignition coil jump a 1.5" gap?

Next step would be if the injectors are pulsing.

So many things, hard to give suggestions.

[Herr Mustang]

Just an update for anyone interested. Turned out to be a bad MAP sensor.