UOA pre or post AutoRx?

[Enigma]

2000 Ford Expedition 4wd 5.4l . 53K miles.

Only 3k on the odo since I purchased truck used. I want to clean it out and then find out what kind of condition the engine "really" is in. Should I do UOA before or after AutoRx?? What is the best method to diagnose engine health?

 

[sprintman]

yes do UOA before and after. Pity more don't do this IMO. It really shows RX doing it's thing acording to Terry if my memory is correct.

 

[Patman]

Yep, do it before and after! I did this with my Firebird and the results were definitely better on the after run!