TNX Realm Noobie
2006 Night Armor Xterra Off Road 6MT
Join Date: Dec 2008
Location: Bellevue, WA
Thanks for the good advice, folks. My mechanic tells me that the problem is that it's one of the rear cats that's causing the problem, and those were not addressed when I replaced the front ones. So, I've got a rear driver's side cat on order and will swap it out next week. At least that's relatively quick and easy work.
I don't know if the cam and crank sensors were replaced, and if so, if they were OEM. I'll check with the mechanic when I see him next week. I chatted with him today to confirm that his diagnostics last week had checked fuel pressure and compression, and he said yes, that both were good... so that rules out fuel pump and filter, and it also means any crud from a bad cat has not had a chance to damage the rings.
Finally, I'm not really noticing the misfire, other than the CEL indicating it. The truck runs pretty smoothly, starts smoothly, has power, and easing up on the throttle does not stop the CEL from flashing. In fact, I've gotten it cruising down a hill with barely any throttle. When I had the misfires back in December, those were real obvious -- the car would lurch and lose power. Whatever's going on now is relatively subtle.
Last edited by mkporwit; 05-18-2019 at 01:52 AM.