Do those of you who own the KE70 with the 4K engine,

find that the PCV valve tends to be a source of trouble,

particularly in an aging engine with loose rings/valve seals

and burning quite a bit of oil ?

 

Moreover, the 4K, even when new, tends to have quite a

lot of blowby.

 

My engine suddenly started to idle a bit rough today, and

I suspected the PCV valve was clogging up again. This had

happened on quite a few occasions before, with the mechanic

scratching his head after checking the plugs, distributor,

carburettor, fuel pump, once even suspecing a burnt valve

on the 3rd cylinder, before finally unplugging the PCV, plugged

its inlet with his thumb, causing the engine to idle normally again.

 

So I pulled out the valve from its grommet in the head cover,

sprayed some Philips contact cleaner, followed by silicon spray

into its inlet, shook it a few times, and plugged it back in.

 

Initially it didn't appear to work, but I guess the sprays took some

time to loosen the spring-activated valve inside, and finally it

idled normally again after some time.

make sure your using the right oil, if the oil is to thin it will just burn and have excessive blow by therefore clogging the pcv

Good man!! Thanks for that, I'll clean mine & keep an eye on it.