Ford: 1986 F700 429 Gas, fuel compression, firing order

Question
The truck missies what do you think? I would like to know the firing order (1986 429 gas engine) for this truck n model? thank you much!!

Answer
Hello,

15426378

same as most fords.


Miss fires can be vac leaks, insufficient fuel, compression or other cylinder problems, worn or damaged tune up components.


Best to start with basics.

check for vac leaks, then collect engine compression, cylinder leak down, fuel pressure, and vacuum at idle.  Inspect all tune-up components.


Just a note:  skipping the compression and leak down can have you spend alot of time and money on something that needs much more.