i bought a 1994 Cherokee sport 4dr 4.0 ho i6,my ??? is runs smooth and quiet but after warmed up for a bit i hear a slight knocking sound at idle,outside of jeep and under hood,but driving down road ,or giving it throttle from under hood it stops.....?#2 oil is blowing pass my oil fill cap and on my valve cover, hold 60+oil preesure driving cold warmed up at idle about 40-45pressure ,in gear and fot on brake warmed up 30-40 pressure ,just the knocking has me worried 183,375 miles on well maintained motor,but the old man said its gone through 3 starters (autozone),in about 18 months newest in may of 2010 ,any thoughts ,did i get the shaft on this ? worried....keith

 

Well welcome to being an XJ owner. Also welcome to the wonderful world of the 4.0L engine. Noise is fairly normal. My 4.o sounds like a diesel and even acts like one when shutting down, it actually shakes the whole jeep as it comes to a stop. The oil past the fill cap is a new one to me... maybe your cap is not sealing and needs to be replaced? As for the oil pressure it seems like that is around where mine is running and i have 109K on it now. All in all it sounds like a typical jeep with a 4.oL engine. Happy trails and enjoy!

 

If oil is coming out the fill cap, then either the engine is way too full, or the PVC valve built into the valve cover is clogged up. Any oil vapor that needs to come out should be coming out the PVC hose and running to the intake.

As for 'knocking' while running, is it a loud knock, or rapid little ticking knocks? The latter is lifter noise and fairly normal.

 

mine does the same thing when you start it after that she`s fine x2 they all sound like that it`s my favorite sound

 

No pcv its ccv give the right info. If you know what a PCV valve is compare it to whats on the jeep valve cover empty 90's pvc valve wasn't hallow. Common SenseThat way he can find the right parts IF NEEDED.

 

maybe its the bolts on the flex plate or flywheel or whatever. the ones in the bellhousing