Kelly Gordon Posted March 4, 2014 Report Share Posted March 4, 2014 I have a silver G4 Xtreme Pro, S/N: 10594 w/ the Subaru V10 adapter harness. I recently dropped a new motor into my 2007 STi and everything ran fine for the first 3000 miles but recently I have been experienceing some odd injector behaviour. My car has fairly good fuel mapping on it right now but sometimes after I've been driving a while my wideband will go max rich (<9.5:1 AFR) and the car runs like crap. Sometimes it clears up, sometimes it doesn't.  The first time this happened it was on the #2 injector. The #2 injector turned on as soon as the key was turned to the start position and stayed on over the course of a few days. I initially though it may have been a harness issue and I proceeded to go over both the engine and the chassis harness' but found no signs of a grounded wire or any sort of damage.  I put everything back together, started the car and idle and AFR were perfect. I then went on about a 30 minute test drive and everything was fine for most of the trip but I had two occasions when the car went max rich again. I pulled over and performed the injector test function to make sure all the injectors are firing and this time it was injector #1 that was stuck on.  I cycled the key and tested the injectors again and they all clicked as they should @ 50% duty cycle. Cylinder 1 at times would cut out then begin clicking again after some time which has me thinking it may not be a wiring issue like I first suspected but maybe an issue with the injector drives. The same problem has shown itself on injector drives 1 and 2 so far, is this something anyone back at the factory has seen in the past. I think I may send the Link back for you guys to test it out for me. How can I make that happed. Thanks. Quote Link to comment Share on other sites More sharing options...
Simon Posted March 4, 2014 Report Share Posted March 4, 2014 That does sound very odd, We have seen injector drives fail but this is normally results in the injector being stuck on 100% of the time. Rather than an issue that comes and goes. No problem for us to test on the bench We would ask you fill the following in before returning the unit https://docs.google.com/spreadsheet/viewform?usp=drive_web&formkey=dHQ3YVVvYkdaWUVqTmgwSXQyMjE2YlE6MQ#gid=0 Quote Link to comment Share on other sites More sharing options...
Kelly Gordon Posted March 5, 2014 Author Report Share Posted March 5, 2014 What else besides an ECU problem could cause something like this? I've already looked over the harness pretty throuroghly. Quote Link to comment Share on other sites More sharing options...
Kelly Gordon Posted March 7, 2014 Author Report Share Posted March 7, 2014 I attached a copy of my map and a log file that shows the problem happening a running engine two times. I've marked the times when the AFR goes full rich and runs like crap. Quote Link to comment Share on other sites More sharing options...
Kelly Gordon Posted March 8, 2014 Author Report Share Posted March 8, 2014 Another thing that was changed on this build was my upgrade to from 4.9.7 firmware to 4.9.9 firmware. Are there any know issues with the latest and greatest firmware? Quote Link to comment Share on other sites More sharing options...
Kelly Gordon Posted March 8, 2014 Author Report Share Posted March 8, 2014 Before I send the ECU back I'm going to go back to 4.9.7 firmware Quote Link to comment Share on other sites More sharing options...
Simon Posted March 10, 2014 Report Share Posted March 10, 2014 I would try the earlier firmware. We don't have any known issues like that currently but there might be that chance. A firmware roll back will help in that case. Quote Link to comment Share on other sites More sharing options...
Kelly Gordon Posted March 10, 2014 Author Report Share Posted March 10, 2014 I rolled back to firmware 4.9.8.1540 and put over 100 miles on the car today without a problem. I'm going to continue daily drive the car the next few weeks to see if the problem show itself again. If it doesn't come back I it would be wise for you guys to look for glitches in the latest G4 firmware. Quote Link to comment Share on other sites More sharing options...
Simon Posted March 11, 2014 Report Share Posted March 11, 2014 That does sound very promising. Other than rolling the firmware back no other changes made? Quote Link to comment Share on other sites More sharing options...
Kelly Gordon Posted March 11, 2014 Author Report Share Posted March 11, 2014 No other changes where made besides the firmware rollback. So far I have about 300 miles on the car and the drivability has been great.  The last dyno session I had (with 4.9.9 firmware) had to be cut short because the engine was very knock happy and wouldn't take more than 13 degrees ignition advance without maxing out the knock sensors on cylinders 2&4. On the same map and a map with a slightly more aggressive timing map loaded the knock sensor has been essentially silent so far. I haven't really taken the time to flog the car yet but so far the car is running wonderfully.  Quote Link to comment Share on other sites More sharing options...
Kelly Gordon Posted March 24, 2014 Author Report Share Posted March 24, 2014 Just and update... The car has been running great for the last 850+ miles since the firmware roll back. Is anyone looking for possible glitches in the 4.9.9 firmware. I have attached the map I was running and had problem with. The only thing to change was the firmware.  I came very close to hydrolocking my motor more than once due to this problem and it could very well be an expensive glitch for someone if they aren't paying attention. Quote Link to comment Share on other sites More sharing options...
Simon Posted March 25, 2014 Report Share Posted March 25, 2014 Yep always testing and checking, but in this case have not been able to replicate on the bench. We will continue to look though. Quote Link to comment Share on other sites More sharing options...
Kelly Gordon Posted April 14, 2014 Author Report Share Posted April 14, 2014 Just an FYI, 2000 miles since going back to 4.9.8 firmware and the injector problem still has not resurfaced. Is it possible for the firmware to be corrupted on download but the EMS not show any errors or faults? Like I said before the only thing that has changed since I had the initial problem was the firmware. Quote Link to comment Share on other sites More sharing options...
Simon Posted April 14, 2014 Report Share Posted April 14, 2014 Not that we have seen in the past. But there is always a first time for every thing. We still have not been able to produce on the bench or seen any other case come to light yet. Quote Link to comment Share on other sites More sharing options...
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