I recently was driving my 1998 Acura integra LS turbo and the car started idling very rough, when i got home i starting pulling spark plug wires and found out that cyl #3 was not firing. First thing i did was check the compression, and it was 181 psi (Stock b18), so that was fine. I pulled the plug and wire and grounded it against my wastegate, started the car and it had perfect spark, and i put a new cap and rotor in just to make sure. So, then put the plug and wire back in, started the car again, shut it off and inspected the plug, it was warm and dry (no smell of gas) but looked dark grey, so i figured the cylinder must not be getting fuel. Just so you know, my injection setup is RX7 460cc (low impedance) injectors with 10 ohm 10 watt resistors. So i first thought maybe one of my injectors failed, so i swapped injector #3 and #4, and it still continued to not fire on cyl #3, therefor the injector must be fine. Then i started checking the wiring. I turned the ignition in the on position, and checked power at each injector plug, and all were recieving equal and consistant power, about 13.4 volts, and i checked the resistance on each wire, and all were reading about 11.4 ohm's. I then checked the continuity of the ground wire on the injector plug, to the ECU plug, and injector #3's ground continuity seemed fine and the same as the rest. So i figured it must be the ECU. I purchased another p06 (thats what i was running before, chipped and running crome), and transferred all of my gear for a socketed ECU and started the car, and it has the same problem, then, i put my stock computer in just to see if it would start, and the same problem, so the problem is not in the ECU!

So, now im wondering how the ECU knows when to fire each injector. Does it know this from a sensor in the distributor that might be going bad?

Sorry for the long post, im stumped, Thanks for the help in advance!!

 

Compression
Air
Spark
Fuel

I think you might be missing... air? Lol... Dude that is messed up! Im curious, good luck!