My rb25 isn't running right - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

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 )

06-21-2012, 05:55 PM	#1
Thatsoverated101 Join Date: Jun 2012 Location: Pembroke nh Age: 36 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	My rb25 isn't running right 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????

06-21-2012, 07:03 PM	#2
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Did you get the PFC set for the 550cc injectors? __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

06-21-2012, 07:22 PM	#3
feito Nissanaholic! Join Date: May 2007 Location: Texas Posts: 1,999 Trader Rating: (1) Feedback Score: 1 reviews	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

06-21-2012, 08:19 PM	#4
Thatsoverated101 Join Date: Jun 2012 Location: Pembroke nh Age: 36 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	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 )