i just cleaned intake manifold/EGR pipe and have a question

took me 3-4 hrs with breaks. medium difficulty and lots of pipes and wires in the way. i took an opportunity to clean TB and replace PCV. near 70,000 miles of 50/50 hwy/city driving, almost always top-tier gasoline (shell lately). i did it because pinging at medium load hwy driving on 2 separate occasions (different gasoline). I've heard plugged EGR can cause pinging.

there were some deposits in the intake and EGR pipe but nothing critical. i could've waited till 150,000 miles easily. intake deposits comparable to that in corolla with 90,000 miles, but corolla had some oil in intake manifold, prius had little. corolla was oil burner since 75000 miles, prius is not burning any oil yet.

here is a question: i lost some coolant when disconnected coolant lines to TB, about 0.5 qt or less. what should i do to eliminate air from the cooling system? i haven't started the engine yet.

thanks!

 

never mind, i found the air bleeding info here: Gen III Coolant and ATF change problem-free | PriusChat

i forgot to mention, the TB was surprisingly clean, much cleaner than i've seen in other cars at the same miles (i guess like air filter too).

 

you are right, the space below TB had some wet oil light reflection, but i didn't bother to clean it. unlike corolla's intake, no oil dripped from manifold when handled at different angles. i assumed negligible amounts.