I have been dealing with the dreaded p0420 code in my 03 Grand for some time now. Its a 4.7 ho with the two mini precats, full size Magnaflow cat and 4 O2 sensors. I have read numerous articles that say its the drivers side top O2 sensor, some that say the pre-cats need replaced, and some that say it could be caused by a exhaust leak causing Jeep: Grand Cherokee: Overland Sport Utility 4-Door: 4.7L 285Cu. In. V8 GAS SOHC Naturally Aspirated: 4.7L V8 CALL US FOR COMPATIBILITY WITH YOUR VIN Read more Read more compatibility notes Read less Read less compatibility notes: 2002: Jeep: Grand Cherokee: Overland Sport Utility 4-Door: 4.7L 4701CC 287Cu. In. V8 GAS SOHC Naturally Aspirated 99 Wj limited rebuilt 4.7. Upgrades: HO cams, bored TB, kolak exhaust, Diy CAI, 2" BRA coils, Bilstein 5100s, JKS trackbar, addco rear sway bar, 3/4" spacers up front, DIY front shackle mounts, raningler cargo net, custom steering wheel cover, 2012 jk black gas door. 67 Mustang 2.3T Project. 417 listings starting at $1,700. Jeep Grand Cherokee in Phoenix, AZ. 107 listings starting at $5,995. Jeep Grand Cherokee in Seattle, WA. 101 listings starting at $2,900. Find 129 used 2004 Jeep Grand Cherokee as low as $2,000 on Carsforsale.com®. Shop millions of cars from over 22,500 dealers and find the perfect car. 4.7 HO Engine Rough Idle Problem. Hello everyone. I'm new to this forum and this is my first post. Unfortunately, my first post has to do with a problem on my '02 WJ Overland. I recently had the heads rebuilt and milled by a local machine shop (vehicle has 199k miles). The heads were reinstalled today and the mechanic working on it took it for Jeep Grand Cherokee 4.7 wj HO 190 kw. - TOP - [20.12. 2023] Prodám jeep grand cherokee 4,7 l WJ 190kw h.o. 2003 rok, 267t km, plyn LPG, tažné 3360 kg, originál dobrý stav bez nějakých úprav. 190 000 Kč. jnqXb8. 2002 WJ 4.7L Oil (?)Leak - Possible Head Gasket Failure. - When starting the Jeep the oil pressure indicator would go quite high (above the 3/4 mark) for a while and then settle down to a normal range (although it would go to 1/2 mark when idle and then higher when driving). At first I suspected the oil pressure sender was bad. Used 2004 Jeep Grand Cherokee Overland Sport Utility 4D. Boydton, VA. 23917. V8, HO, 4.7 Liter. Horsepower. 265 @ 5100 RPM. Torque. 325 @ 3600 rpm. Fuel Economy. City 14/Hwy 19/Comb 16 MPG. 43 posts · Joined 2011. #10 · Feb 16, 2012. Everywhere I have looked has. (4.7L) Mopar®P/N SPRC12MCC4, 0.040 gap (this is Champion RC12MCC4 #439) CAUTION: The standard 4.7L engine uses copper core ground electrode spark plugs, they must be replaced with the same type/number spark plug as the original. As the engine warmed up, it dropped back down to 30#. As the engine approached operating temp and increased to 1500rpm, the pressure dropped to 25# and slowly dropped to 20#. Once I dropped back to idle, pressure was about 17-18#. I run a Mopar oil filter and synthetic oil. When the electric oil pressure gauge had been hooked up, it was reading 03 Overland 4.7 Misfire. I'm working on my friend's 2003 Grand Cherokee Overland with the HO 4.7L V8. The truck had a misfire on cylinder #2, causing a check engine light with code P0302. The misfire was not noticable, but the fuel mileage seemed poor and the engine was a little rough on a cold start. At 113,000 miles, he had never changed the

jeep grand cherokee wj 4.7 ho overland