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View Full Version : My rb25 isn't running right


Thatsoverated101
06-21-2012, 05:55 PM
Ok I'm brand new to this forum and to the rb family but here's what I have so far. 1989 240 with stock rb25 with Cx racing turbo, 550 deutch works injectors, walbro 255, apexi power fc. Now here's the problem. I just put the rb in this past week and upon first start up it was running rough. I pulled all the plugs and replaced them and it ran z little better but still not perfect. You can only tell its running bad once you give it some throttle and it stutters, so I started checking coils to see if it was spark related. Now here's where it gets Wierd. All the coil packs are good and are giving off good spark, but I can disconnect the 5 and 6th cylinder coils and the car runs exactly the same. There is no smoke at all from the exhaust like youd expect from unburnt feul. Any ideas????

fliprayzin240sx
06-21-2012, 07:03 PM
Did you get the PFC set for the 550cc injectors?

feito
06-21-2012, 07:22 PM
check all your pin connections at the ecu. When i first got mine running cyl 1 wasnt cutting whenever i disconnected the injector. Continuity checked good all the way from the injector connector to the ecu. It turned out to be the pin being a little rusty at the ecu making a bad contact. cleaned everything up and ran suave after that. gl

Thatsoverated101
06-21-2012, 08:19 PM
I figured it out. So this one falls under never trust your friends to help you work on a car lol. I had asked him to connect the clips on top of the injectors and the two closest to the firewall weren't clipped on. I clipped them on and other than a small vacume leak she runs great untill it heats up. The clip for my ox sensor is broken so I need a diagram of what the three wires are that come out of the sensor itself. I know ones ground ones power and ones signal but there are two white wires and one black. I just need a diagram of which is which( besides the obviouse ground )