Mike Diaz

I bought a 1990 CRX DX with a B18A1 / 5 speed manual transmission in the engine bay. The only reason I bought the car is to get it running, gut the interior, and go play at some of the auto-x events. I paid $1000 for a pretty clean body CRX with the drivetrain already installed, new axles, new mounts, poly bushings all around, and coilovers, so I'm willing to do whatever it takes to get it wired correctly and get it running. Enough with the background crap, here's my problem.

I don't know what year B18A1 I have and I don't know what wiring harness/ECU I need to get it done. I believe the engine is out of a 90-91 Integra LS, but I am not 100% sure. I took some pictures with some hope of a fellow member helping me out with some of my questions. I already have 2 PR4 ECU's, one is an OBD0 and the other is an OBD1.

I just need to know what wiring harness and ECU will get my CRX running correctly. Any help is appreciated.

Mike Diaz

Here's the stampings above the exhaust manifold. I don't know if the DPFI to MPFI has been done already, but if you can let me know how to check, I'll definitely do that. I'm very mechanically inclined (ase certified), but my specialty is the Legend C32 and C35 cars. I'm only a novice at D & B series engines.

Minor Threat

Don't worry about the year of the engine, you need to worry about whether you're going to run it OBD1 or OBD0, and that boils down to which distributor you have since you've got both OBD1 and OBD0 PR4s which will do the job fine.

That distributor looks like it has OBD0 plugs on it, but double check the code on it just in case someones repinned and OBD1 distributor.

My suggestion is to get the car running OBD0, so use that distributor, and OBD0 PR4 and a 90-91 CRX/Civic DX harness converted to MPFI. Don't use the Si or HF harness, it may seem like a better idea because the MPFI is already a part of it, but it's not the same at the shock towers at all.

M3Vert

pr3 pm7 ecu