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Injector No 1 And 4 No Fire.

RB30 Ceffy

By RB30 Ceffy,
in Engines & Forced Induction

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RB30 Ceffy Enthusiast

RB30 Ceffy

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Okay guys, I got a problem. I have been banging my head on the wall for a full day of diagnosis.

The car is a Hybrid monster. Its a RB25 engine with RB26 rods pistons ect. Its think it's got a RB25 eng harness but since the engine was in a Cefiro some things have been changed and I cant even really confirm that it is a RB25 or a RB20 Harness that ran this thing. It ran a whole season with a RB25 Apexi PFC but since my bud wanted the D-Jetro he got a RB26 D-Jetro box to run the thing. We have now built the engine and when I start it up I don’t get the no 1 and 4 injector to fire.

I’ve gone through the pinouts a million times and everything seems to be pretty good. I tossed in a RB20 ECU to see if all 6 would fire and they do. So I then tossed the RB26 PFC into another GTR to see if the injector driver was messed but when I tossed it in she ran fine. So I know the box it fine.

When I toss the probe on the injector pins on the ecu "101, 105, 103, 114, 110, 112" They seem fine as the probe switches back from 12V and earth.

When I toss the NOID LED light on the injector plug no 1 and 4 don’t light up as bright as the rest. They do light up but not full out like the rest. I have checked resistance between the ecu plug and the injector plug and everything seems fine with all the connections in between.

All 6 injectors are good and tested just yesterday. All settings are set up properly with them too. We are not running the VVT anymore.

I looked at the differences between the 20/25 ecu pinouts and the 26 pinouts and there were some differences so I figured I might be getting a voltage signal to the ECU that’s not meant to be there so I removed the pins that were blank on the 26 pinouts to make sure I wasn’t getting any voltage feedback.

I am stumped. Any help is appreciated!!!!

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RB30 Ceffy Enthusiast

RB30 Ceffy

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KK Guys, I figured it out. Took the harness apart and cleaned it up and found that the front MAP sensor was pined wrong to the maf earth and not the signal. So ya. Stupid lil problem that took an entire day but its all good. The car runs and I can go eat some taco's now. Night!

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