2002 Nissan Xterra 4x4 3.3L non supercharged
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My wife has a 2002 4x4 3.3L none supercharged Xterra that is named Cronk. She was having some issues with it most concerning to me was antifreeze coming from somewhere under the intake. I took the plunge and peeled that sucker off. the leaks where coming from the coolant bypass hose and the very back passenger side pf the plenum. it took a good wile to clean and I fully understood why the old knock sensor went bad. The factory casting on all that is terribly rough so I smoothed and polished the plenum and intake. The old injectors are very brittle so I replaced them all and the O rings for the fuel rail. Wile I had everything off I replaced the valve cover gaskets and spark plugs and wires. FYI all parts are OEM. i replaced all of the vacuum and coolant hoses. Once it was back together I started Cronk up and was very pleased with the way he was running. That's win a gremlin came out and maid my life hell. after a few minutes it started to misfire. This hole time the code has been p0300 random multiple misfire. I tested the new intake gaskets buy spraying brake clean on them to make sure it had a good seal and it did. the plugs are all good except number one is usually still wet with fuel win I check it. I did a compression test and number 1 is 127 and they only went up from there. I replaced the fuel filter and presser tested that as well and its good. The cats where turning bright red so I ended up installing headers and all new O2 sensors thinking the cats where clogged and I did get a code for the O2 once. still misfiring, replaced the entire distributer and throttle position sensor because they were not completely to speck win tested. Still misfiring. win I remove one spark wire at a time the only one that doesn't effect how it runs is the number 1 cylinder. I swapped wires plugs and injectors and it still acts the same. I have even replaced the evap clinoid. now I'm thinking its ether the ECU or the number one having the lowest compression has a leaking valve or ring. I really don't want to do a rebuild if its not for sure the issue if anybody could help me in any way it would be such a blessing.