Good evening all! Hope everyone is doing well. I have recently begun experiencing an issue on my 2003 F150 SCrew with the 5.4l. When accelerating from a stop or hitting a bump the truck will stall. This is not a miss as I have experienced these before. It is more like the engine is losing all electrical power. I have done the wiggle test on all connections and wires I could find both under the dash and in the engine compartment. I have also checked the ground straps and made sure the battery is good. I have checked the connection to the crankshaft position sensor. I did find my connection to the ignition switch a little loose and snugged it up. At this point I am thinking the ignition switch or lock cylinder is to blame since when the issue occurs it resembles the key being switched off (the engine looses power and gauges all zero out). Has anyone experienced this before? Any other ideas as to what could be the issue? As always, thanks in advance for the help!

 

This may not be related- but it may give you something to check- my wife had a fox chassis LTD- it stopped dead in its tracks!- no lights,( brake,signal,safety,) no nothing- battery and cables all good,clean and tight-
Started checking voltages- to shorten the story- there was a harness connector above the left front headlight up in the fender that was a corroded mess- it was acting like a big insulator-
Cut out the connector, spliced the wires, heat shrink, tape and voi'la!- no more problems.
Electrical issues are a bitch- hope you have success- best regards, Bear.

 

Thanks for the advice! I actually checked all the wiring when doing the wiggle test. I was able to pull code B1352 from my scanner. I read that this mostly related to the door chimes being disabled, but mine are not. According to my scanner this is for the ignition switch. So far my plan is to have the altenator tested this weekend and If that checks ok then I will be replacing the ignition switch.

 

did you ever resolve your stalling issue? i'm experiencing similar problems