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I had swapped a RHD EJ22 into my car after I cooked the EJ22 I had in it. The engine was free, it had been diagnosed as having bad rod nock by one shop. The owner, a postal driver, had dropped the RHD legacy off at another shop with a replacement engine. The owner of that shop didn't think the engine was bad, and had me take a listen. I told him it was probably a cracked TC flexplate. They pulled the motor, voila, cracked flexplate. The replacement engine had <100k miles on it, so they put it in anyway because the legacy had a lot of miles on it and a low milage engine couldn't hurt. The postal driver didn't want the old engine, so the shop gave it to me. My car was running on 3cy's at the time, so it was a perfect opportunity.

 

They had to cut a few plugs off of the RHD engine harness to put the used engine in. I had a spare engine kicking around with a good harness on it, so a friend swapped the harneses over for me while I readied the engine bay for the switcheroo. We chucked the engine in, it ran good, had plenty of power for a high milage engine that's seen nothing but stop and go driving since day one. But it had a miss at idle. It had blips here and there as it warm idled. I tried plugs, tried wires, tried techron fuel cleaner, and decided to just ignore it when nothing worked. Untill I saw this:

There are certainly a few possible causes, but there's a simple one to investigate. Verify that the injector connectors for #2 and #4 are in the right place (not reversed). The engine will start and run with them swapped, just not very well. There should be a piece of identifying tape around the harness right at each injector connector; it's white on the front cylinders (#1 and #2), and black at the rears (#3 and #4). If the tape is missing, you can check the wire colors.

The light bulb went on.. swapped harness... missfires.. sequential injection... fine at speed, misses at idle.. it all came toghether.

 

Went out and swapped the 1 and 3 injector plugs. Ta Da! misfire gone. I was so happy I took it out for a good wheeling run.

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