Question about 1991 Ford F150
Gasoline engines need three things to run, fuel, air, and spark. Do you hear the fuel pump running from the outside of the vehicle for a couple of seconds when you turn the key to the on position? Check your fuses, on electronic fuel injection systems the engine won't run if the engine computer has no power. Spark: Take a spark plug out, connect the wire back to the plug, hold the threaded part against the engine block (hold this by the insulator, not the plug, you might get a bit of a shock) and see if there is a spark. Otherwise, just unplug one of the plug wires (either on the plug or the distributor), and hold it a small distance (1/4 inch to 1/8 inch) from where it was when connected and see if you can hear arcing. Air : Check your air filter /intake ducting for restriction preventing air from going in the engine.
I have put these in the most common order of solutions to a no start on a gas engine. From there, you can figure out which component is missing, whether gas, spark, or air, and go from there.
Posted on Aug 12, 2008
If you have sheared the pin on the distributer gear, it will still spin but will be completely out of time. Might catch in the right place every now and then and fire but for how long is the question. Check the timing, After you've checked for gas and spark. I've only seen a problem with not getting enough air once and it didn't stop it from starting. Some critter built a nest in the intake.
Posted on Feb 14, 2010
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