[f10nate]

I got a 15 n63tu an I’m throwing a p0030 and a p0036 bank 1 and I’m getting multiple misfires on the scan tool it’s saying dme 2 misfire cyl 5 7 and 8 this all started right after I put the cats back on and I thought the cats where clogged so I put the downpipes back on and it’s still misfiring. I don’t see o2s on bank one causing misfires this bad, any ideas

[S EyeLand]

Originally Posted by f10nate

I got a 15 n63tu an I’m throwing a p0030 and a p0036 bank 1 and I’m getting multiple misfires on the scan tool it’s saying dme 2 misfire cyl 5 7 and 8 this all started right after I put the cats back on and I thought the cats where clogged so I put the downpipes back on and it’s still misfiring. I don’t see o2s on bank one causing misfires this bad, any ideas

You prob damaged an O2 sensors if you were messing with the cats, happened to me half the time I went catless.

[f10nate]

Yeah I had the cats in and out least 3 times have you seen misfires from that though?

[RockCrusher]

Address the O2 sensor codes. They point to a bad #1 sensor and a bad #2 sensor (#1 before the converter, #2 after the converter).

Handle the new sensors with extreme care. Do not use anti-seize. This can foul the sensor tips. (When my cars (Porsche cars) needed new O2 sensors I used factory sensors. They came with a light application of some clear grease on the threads.)

With the error codes gone then see if misfires are still present.

With exhaust system work an exhaust leak is always a real possibility which could account for the misfires.