I am a new poster, own a 1990 F150 4.9 six EFI with a 4 speed w overdrive. the original ECU was replaced about 5 yrs ago and the replacement has gone bad. the numbers are not available. So where do I start to get the right one back on my truck? It only runs under 30 mph, so difficult to get around. Help

 

Welcome to the site
Tony

 

Tony, thanks, I hope I can find some help on my issues with my F150, 1990 with a serious ECU. thanks

 

Sounds like it could be in Limp-Home Mode. I suggest asking in the 87-96 forum:

1987 - 1996 F150 & Larger F-Series Trucks - Ford Truck Enthusiasts Forums

 

thanks....I will