Nov 20, 2021 · I noticed a fair bit of oil and residue in the air box of my 98 4.0 ZJ, which starts very hard now, so I’m thinking it’s time to replace the original PCV / CCV and maybe clean my IAC. I’ve never actually replaced these before…do they just pull straight out? Do I also should replace the grommets?

Dec 28, 2007 · Most engines its PCV but for some reason on the 4.0 is called the CCV system, they are basically vacuum lines. When you need replacing you will notice oil blowback the most, around the grommets (valves on top of engine) and oil blowback on the air filter. Pop your hood and check it out.

Apr 30, 2011 · When I found this problem on mine the rear ccv line was clogged and was causing the issue. The rear line is supposed to allow unburned particles to be pulled through the intake and burned off in the cylinders, the front line is to allow fresh clean air into the crankcase.

Jun 26, 2008 · Starting around model year 1987 the 4.0L Jeeps used a CCV (crankcase ventilation system) instead of a PCV (positive crankcase ventilation) valve. The difference being that the CCV is a "closed" system on the Jeep 4.0L requiring two ports in the valve cover.

Feb 7, 2025 · OEM new old stock crankcase to air cleaner vent tube for 4.0L engines, compatible with Jeeps: 1993-1996 Grand Cherokee ZJ, 1991-1995 Wrangler YJ. Part number 53006237. These are original unused factory parts.

Oct 11, 2008 · 4.0 CCV system to 258 PCV valve swap - anyone tried it? On another site I read a post where someone had trouble with the stock CCV setup clogging up and replaced the rear CCV hose and elbow/orifice and valve cover grommet on their 4.0 XJ with a standard PCV valve setup from a 1985 CJ7 (258 engine.)

Jeep Grand Cherokee ZJ 1995 4.0 6 Cyl Crankcase vent tubes, these are in fair shape, the tubes are good, the rubber couplers have cracks in them, the one rubber coupler is bad, these are sold as shown.

Mopar OEM new old stock crankcase to air cleaner tube for 4.0L Jeeps, fits: 93-96 Grand Cherokee ZJ 91-95 Wrangler YJ Mopar 53006237 These are original unused factory parts. Supply is limited.

Feb 24, 2025 · 93-96 Grand Cherokee ZJ. 91-95 Wrangler YJ. 93-96 Grand Cherokee ZJ. 91-95 Wrangler YJ. Skip to main content. Hi ! Hi! Sign in or register Daily Deals Brand Outlet Gift Cards Help ... Crankcase to Air Cleaner CCV Tube for Jeep Wrangler YJ Grand Cherokee ZJ 4.0L. Region Offroad (3582) 99.8% positive. Seller's other items Seller's other items ...