Engine missing on cyl 2 and 6

[Gene H]

Engine has been rebuilt with heads redone, new cam, cam bearings, rings, rod bearings, main bearings, rocker arms, push rods, oil pump, timing chain w/ sprockets, guides and tensioner. It has new plugs, wires and coil pack. compression is 180 to 190 on all cylinders but you can pull plug wires 2 and six off and it doesn't change. Any other wire you pull off does what you would expect it to do. Any ideas?

 

[superj]

maybe those two are swapped?

welcome to the group

 

[Bgunner]

Check and see if you have spark at the ends of #2 and #6 wires. IF you do it is most likely a fuel delivery issue, assuming the engine was built, valves adjusted properly and wires are going to the correct cylinders.

 

[snoranger]

Cylinders #2 and 6 share the same bank on the coil pack. I’d start there and see if it’s a spark issue. If there’s no spark, it could be a bad coil pack, wiring, or driver in the ECM.

 

[WutUp Clegg]

Check for spark. If there is no spark, then you will know where to look. If there is spark, then you know it's a fuel issue.

 

[Gene H]

maybe those two are swapped?

welcome to the group

Thanks for the replies. I went out to the shop last night and did what I should have done first. I used the scan tool for OBD1 and on the KOER test I got a code 172. I'll be replacing the O2 sensor on the right bank tonight and I'll post the results when that is done.