New Engine running better except for this

[TXd150]

Ok, this has been an adventure or nightmare depending on what day we’re talking about. I successfully removed a bad engine and installed a new one. It ran like crap like most people here have experienced when you dig into one of these trucks. I figured most of it out thanks to everyone who helped along the way. First I had to get an old scan tool to check fuel sync then had to replace the catalytic converter and O2 sensors since the originals were fouled and clogged with oil/coolant from the old engine. This made a world of difference, the engine runs a lot smoother now without all the bucking, popping ,hissing , and smoking it was doing before. I have a couple of things to check and work out still, first the Cat pipe is crooked from the factory and needs to be bent to enter the stock muffler, next I think we have a misfire that’s not tripping a code. When setting the sync the numbers jump from 0 to 2 and never stays steady for too long, I checked the exhaust manifolds with a temp gun and all read like in the 400 F degrees except the number 6 cylinder read in the mid 200s. It started to rain so I’ll have to check that when I get back from work this week. I’m thinking of checking spark plug wire with a spark tester first then removing the plug to see what that looks like. Also, the new Cat got red hot before I shut it all down. It must getting fuel from that dead cylinder. Everything else seemed fine, coolant temp was good and the new radiator seems to be doing its job.

 

[TXd150]

Everything checked out ok on the plugs and injectors, got the exhaust done today. I’m still having issues with the engine running sloppy, it has a heavy rich fuel exhaust odor from the tailpipe. I checked the pressure on the fuel pump and it went to 70 psi then vibrates at 60 while running the engine. The psi drops to 0 right after turning off the engine, not sure if this has anything to do with engine running the way it is. Next I’ll try to test sensors, I did hook a scan tool to it and upstream O2 V goes from 0.10 to 0.63 and the Downstream O2 V show 0.02 and 0.04 only while idling, Both 02 sensors are new.