Question about 2000 Jeep Grand Cherokee

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What is the little hose called that runs into just below oil fill

What is the little hose called that runs into just below the oil fill cap called? Mine has a hole in it and I would like to replace it. It blows air out when engine is running.

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  • junky777 Jul 15, 2009

    No it is not a 3/4 inch hose. It is maybe 1/4 to 3/8 inches. It is a metal tube that looks like it has a 1/2 inch to 5/8 inch rubber piece leading into the tube below the oil fill cap. The metal tube runs to the back of the engine into another rubber piece. Sorry I am not sure what the correct terminology for these pieces are.

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This is usually part of the emission control system that prevents crankcase oil vapors from venting to the atmosphere. Any decent auto parts store should have a computer breakdown of the various systems especially any engine components, and especially anything having to do with emission control. Arrive with a decent description of what you are looking for, the year of the vehicle, engine model type, A/C or not, and they can help you. It is probably a certain length and size of standard hose that they stock by the roll and just sell it to you by the foot. Shouldn't have any special fittings as it usually just a slip-fit onto fittings near the cap and also somewhere on one of the systems of the engine. If it is BLOWING, and not a vacuum leak, this is the supply hose to the upper part of the engine for the positive crank case ventilation system. If this has helped, please rate it accordingly. Good luck.

Posted on Jul 15, 2009

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If it is a 3/4" hose similar to a heater hose, it goes to your air pump system. it can be replaced with standard heater hose.

Posted on Jul 15, 2009

  • Richard Scordino Jul 15, 2009

    Know what? Even if you can't "name that part" you can simply get a section of rubber hose, cut the metal line where it's leaking and put the rubber hose on right there. likely you don't need more that three or four inches and for security, put a couple of mini'clamps on the ends...case closed!!! Sort of like if you see a guy bleeding, you don't need to know his name to give him a bandaid!!!

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Posted on Jan 02, 2017

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1 Answer

Ford 5.4L 3 valve motor has vacuum in the oil pan and will not run with the fill cap off.


The only vacuum being pulled, is the hose from the valve
cover (PVC) hose ,I believe, to the throttle body area

The reason you have a crankcase vacuum so high on the other
valve cover & oil fill cap, is that air can't get in to replace the air
drawn in behind the throttle body

eg: you have no air coming in,find out why

I think the air in comes from the ducting around the MAF Sensor
area in a 1" plastic or rubber tubing to the cover where your fill cap is

My Lincoln is like that

I have been around 5.4 fords I just haven't googled a picture of yours,you can do that or look over your truck

The vacuum amount or flow rate is controlled by the PCV valve
hoses & system design,so you have no air coming in the other
cover or little,thus high crank case vacuum

That said-- what your doing is NOT a test & in some motors will set
a MIL Lamp & OBD Codes

Once the oil cap if off, you have an open hole for air to rush in & back to the pcv & intake,so leave it on when the motor is running

Opposite your theory

It dies because with the oil cap off, your letting in unmetered air
that goes into the intake,cylinders & out the exhaust & you loose
fuel trim control,as the oxygen sensors & pcm are confused

Today's vehicles work in Milli Seconds & only work within programmed parameters

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Hose below oil fill cap has a hole in it. What is it called? What does it do?


It vents blow by cases from the crankcase back into the engine its part of the PCV (positive crankcase ventilation system). If it is split not a big deal hardware stores carry lots of hoses like that there about 50 cents per foot.

Jul 15, 2009 | 2000 Jeep Grand Cherokee

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