By your description, its very possible you had backflow and sucked some cat honeycomb in. I live in fear of this every day. It does happen.
I know there were upgrades/line improvements (like the timing chain)... I'd go for the newer engines...Does anyone know what the difference between 2002-2008 engines are compared to 2013-2015?
I'm finding low mileage newer engines for less $ than older ones. Just wondering if I could put a newer one into my 2005.
Looks like he replaced the 4.0 with a newer 4.0So you replaced a 4.0 with a 5.6 v8 or replaced a 3.3 with a 4.0?
Sorry this is waaaay late, but I'll reply anyway.
My truck is an 05 and it only had around 90K miles when the original engine died. I still haven't dug into the engine to find out what happened with it. Someday.
The new engine was out of a 13 Frontier with 22K miles. I bought it from Garry's Auto Recycling (Crestview, FL) off ebay. Came with wiring harness, intake and exhaust manifolds, all sensors, and the throttle body. No alternator or AC compressor. Was a pretty complete engine for the price compared to others.
I had to reuse my original wire harness, sensors on the oil pan, and lower intake manifold so it would work with my 05 computer.