Seafoam- 20 Minute Hot Soak @ 298k Miles

Initial success---
I recently bought a used 2010 damaged Prius with 298k miles. As I go through rehab projects, I successfully emptied a whole bottle into the throttle body after i warmed the engine. As instructed, I sprayed for <10 minutes while engine was on idle between 1000-2000 rpms. Let it hot soak for 20 minutes then took it out for a 20 minute highway road test at 70 mph on cruise control. So much noticeably smoother engine idle and responsiveness on throttle. No CEL codes availed themselves. I shall report back intermittently. I shall consider doing this 2/year.

 

All this was conducted alone and without assistance
i placed the Prius in maintenance mode
during the 10min spray procedure, i intermittently gently revved the gas pedal-- ~ 5 times
idle is ~ 1000rpm
no white smoke from tail pipe

 

Thanks, it was ~ 1 hour of quick fun from a $8 bottle. Not a lot of documented reporting on Seafoam and Prius on PriusChat, nor the greater internet web. I figured I take some risk with this cheap old beater car at ~300,000 miles. What i didnt document was that i wrapped a small swatch of blue paper towel around the thin red spray straw in order to tighten up the vacuum seal. No doubt both my hands experience numbness and fatigue... lol

 

Fortunately for me, I didn't see any white smoke... for now that is... lol
Unlike a month earlier during car maintenance. Then, I had more white smoke emanating from my tailpipe during road testing after I cleaned out the intake manifold/port with solvents and wipe rags. Otherwise I feel pretty confident on the highway at 70mph.

 

thanks, I appreciate your thoughts.