Intermittent stalling

[polarbear]

Had an intermittent stalling issue with the F150. Would run fine for 10-20 minutes, then quit running. Surface streets or freeway- didn't make any difference. If it sat for a few minutes, would always restart. Replaced the coil- that wasn't it. This can be a potentially frustrating problem, because there's so many potential causes. Computer claimed it was running lean on both banks, but never triggered a check engine light.

In our case, turned out to be a fuel pump relay (under the hood in the engine/ECM fuse block). Cheap part- about ten bucks. Wanted to post this in case anyone is faced with the same issue.

 

[Fellro]

I had water get into the relay plug. It ran fine, but when the water would freeze, it would break the connection. Every time it warmed up, it would run again. Took me a little while to find that one...