Well here's the basic story. A friend of mine had a cherry 99 Si before he met me, and the last person that helped him pretty much butchered the poor thing. AC, PS, cruise, got ripped out, and the car was turbo'ed on some pretty lame setup. Engine basically blew, and I was in charge of putting it back together.

New Pistons, bearings, valves, etc. I had to undo some injectors he had and go back to stock, now here's my problem. According to this diagram for the fuel injector wiring.


Brown is cylinder #1, Red #2, Blue #3, and Yellow #4. If that's correct then my injectors are wired as they should. I used the distributor off my car, and it runs the same. Sounds like it's running on 3 possibly 2, but can't even idle, just dies. Oh and the secondary o2 isn't there. Was converted to obd-1 and now it's back on the stock ECU, all OBD-2.

All the injectors are spraying, but I pulled the plugs and 2 are just saturated in fuel. I can see fuel on the tops of all the pistons though, but could two of them be bad and stuck open?

I'm not the best when it comes to electrical, so any help here would be greatly appreciated, thanks.

 

After talking to some others, they made me think. Perhaps I didn't do a good enough job lapping the new valves? Engine has only ran for a minute, maybe two, and it's around 155psi on all 4, but once I stop cranking, it's slowly leaking.

Do the new valves just need some time to seat or should I take the head off and re-lap the valves?

 

Bump.

 

Whenever injectors are in question, you should do a fuel pressure test.

Buy/rent/borrow a fuel pressure testing kit. Attach it to the fuel filter. Turn the key to ON(II). With the FPR connected, it should read 28-36 PSI. With the FPR disconnected, 38-46 PSI. Turn the key to OFF. It should hold pressure for 2 hours afterwards. If it doesn't, you have a leaky injector.

 

Thanks for the info. Did something similar, I just used my FPR Gauge from my integra on it, and pressure was as it should be.

But I figured out the problem/s, and, just as usual, it was something dumb. #1 injector was stuck closed and not working, and the line I had going to the IACV wasn't for the IACV, but rather that small sensor on the back of the intake manifold next to the master cylinder, that on his car is gone being that it as a different intake manifold. So I got the right one plugged in and BAM!

Car runs and idles just like it should.... well for a new, not quite yet broken in motor anyway. It's open header, and a stock weight flywheel, so it kind of wants to die if the revs drop too fast, but aside from that, it's all good.

Mods: You can delete this if you want.

 

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