R33 Injector Missfire With Emanage Ultimate

[courier33]

I have installed my emanage ultimate and found I have an intermittent missfire. Mainly at idle and when holding around 5% throttle at any revs. After doing a datalog on the emanage, the missfire looks like the injector duty cycle is spiking to 99% intermittently. This is on the input duty cycle coming from the standard ecu. I have double checked all of the connections and no fix. It seems to be only one cylinder at a time missing (same cylinder or different ones im not sure) Car runs fine under load and the injector duty cycle acts as normal. I have noticed a few times when backing off from high rpm's, the duty cycle will spike up to 90 -95% and then gradually decrease to about 80% with the revs before dropping back down to 5% where it should be.

Does anyone know why the standard ecu would be spiking the injectors to nearly 100% duty cycle intermittently? Stuffed ecu or could it be something else like CAS. Attached the datalog for anyone who has the emanage log viewer showing the duty cycle input spikes.

r33.zip

[Shano3000]

I had the EXACT same problem with my R33 using an emanage ultimate. Had me and my tuner stumped, Would spike the injectors to 99% duty cycle for a split second whilst at light throttle.

Have heard that this was a fault with some EMU's, not too sure how true it is though. I ended up selling the EMU and getting a pfc instead, Cheers shane.

[courier33]

Damn thats not what I wanted to hear! Re-soldered all of the contacts again, still doing it.

The board I have is a D board although its a late serial number : 05076.

Also had a look at the bottom of the circuit board, and it looks like the aluminium retainer rail of the case is coming into contact with the tiny contacts on the board. Ran a length of insultation tape over the length of the board as a precuation.

[Haines]

mine does it too

I Have bought a Injector adapter harness but havent put it in yet (dont know if it will fix it ,but they say its to stop it running rich)

I also found that when it was missing at idle if i upped the revs to around 800Rpms it would go away