I grabbed these injectors out of a fuel rail sitting in a pile at a junkyard. Off a SOHC D series, that's all I know, I was told they were all the same within the same OBD generation, and I took it for granted that they looked like OBD1 but didn't confirm it. I shipped them to RC for balancing and blue printing. They sent them back with an excellent report card, but one wasn't working, so I returned it to them with 3 of my stock 93 DX injectors, they sent them all back and balanced blue printed one of the DX injectors. So I put all the RC serviced injectors into my DX engine, 3 of them were the junkyard unknown, and one was from my DX. They all worked okay for about six months. Then I did a SOHC OBD1 ZC swap, but I left the injectors that came with it on just so everything would be easy to troubleshoot until we got it settled in. 2 weeks later, I decide to try the injectors that were serviced by RC. The car ran like absolute crap. Bogging and stuttering until I go hard on the gas and get the RPMs up. So I put the old injectors back in, runs like a champ. I'm wondering, WTF. The EX and DX injectors are supposed to be the same, so it should run better with the serviced injectors. Maybe these are the wrong injectors? How do I check? And why did they work ok with the DX if they're the wrong injectors?

Only visible difference is that the ones serviced by RC have a metallic plug like filter that isn't removable, while the ones in my ZC have black plastic removable filters.

Sorry for that, it sounds a lot less complicated in my head.

PS don't send your **** to RC. I started hearing bad things about them after the fact, and my experience with them confirms this. They used to be good. But none of the race teams use them anymore due to inconsistencies. Something most have changed at RC recently.

 

Also, they rated these injectors between 190 and 192 CC at 43 psi. I thought they were 240cc?

Just noticed that one of the injectors serviced by RC is marked 4107 and the other three are marked 2HBF. But it flows 190cc just like the others.