try adding half a litre of tranny fluid to your engine oil sometimes that will help clean them out and free them up.
Its better to pull the head and clean the valve carefully. Also I'd check the spring. It could be weak or broken.
Your problem might not be with a sticking valve. I have a 1995 Isuzu Rodeo that suddenly began making a loud ticking noise I at first thought was due to sticking valve but turned out to be coming from a worn out timing belt tensioner. The Rodeo had 150k miles on it at the time and I was about ready to scrap it before I discovered the true cause. I know have over 190k on the vehicle.
No
Yes , the 3.2 liter V6 engine in a 1997 Honda Passport ( IS an interference engine )
An interference engine ( according to the Gates website the 3.2 liter V6 in a 2001 Honda Passport is an interference engine )
It depends on what type of engine and transmission the Passport has.
The whole car was made by Isuzu, including the engine.
No this V6 is not an interference engine. However the cam belt should be replaced at 75,000 miles. Reason being is that the 1998 Honda Passport is nothing more than a rebadged Isuzu Rodeo, and was not built by Honda and does not have a Honda engine. It has an Izuzu engine.
The thermostat is located in the housing on the engine side of the upper radiator hose on a Honda Passport 3.2 engine. You will have to take the air filter tubing off to get to it.
alldata.com
The engine oil capacity, of your 1999 Honda Passport, is for quarts. The manufacturer recommends; you do not over fill the motor oil.
The library is a great source.
ON THE LEFT SIDE OF ENGINE CLOSE TO THE BACK
Go to any auto parts store and purchase a repair manual. Around $12