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Rb20det Loom Help...

Simon-S14

By Simon-S14,
in Engines & Forced Induction

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Simon-S14 Grand Master

Simon-S14

Posted
Posted

Have had huge issues with my RB20det lately, probs are, ignition cutting out at various points in the rev range (not a miss fire like a plug or coilpack would do, but rather a total ignition cut of all 6 cylns) Some times the problem is only while drifting through corners and not in a straight line.. but a couple of times it has happened while on fullboost in 3-4th gear in a straight line and the ignition will cut out, come back, cut out quite repetively.

Now while this is happening, the Tacho also dies... so to me it indicates a loose wire, or a problem somewhere in the wiring of the ignition system. This resulted in me pulling my loom out.. have a look at it and tell me if all the electrical taping in black is factory or not? I know the red tape looks to be non factory...

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predator Grand Master

predator

Posted
Posted

Nissan does some funny stuff with its wiring, and I believe it is hand wrapped. Some of the black tape looks like a home job, but it's actually factory. Mine was the same. Red is probably extras somebody else has added on.

It could be a CAS problem? A few have had that problem on rb20det's. I think the ECU determines the RPM / Tacho signal from the CAS as well.

darkl0n Contributor

darkl0n

Posted
Posted

i had a issue like this, it would drive fine, then it would start cutting out. it did not matter if you were in a high or low gear, some times i could rev it to 7k and it would be fine, then other times it would just cust out.

i replaced the o2 sensor and it has been fine ever since.

predator Grand Master

predator

Posted
Posted

To test if its the o2 sensor.. remove the o2 sensor plug. Car will work fine without it. Just won't run in closed loop mode, and you'll use more petrol.

Its something like the o2 sensor immitantly sends faulty signals the ecu has problems. But if you remove it totally you can isolate the problem a bit more closely.

I'm not sure how you test the CAS, you'd need to monitor the voltage signals, or use the consult connector to see what's going on.

Also when it does fail, stop the car, and put the ecu in fault mode, and it should flash the sequence for the last thing that failed.

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