Ok, springs are installed.
I confirmed with the dealership that my VIN number shows my car should have the problematic valve springs (These springs will have a yellow and white paint marking). Well, after taking the engine apart and pulling my springs out, it turns out I have the “good” springs (blue & white paint).
Ok, well we’ve already got the ferrea kit and the engine is apart – may as well change them out.
Once finished, we took the car out for some hard runs… no luck… the car is still misfiring.
One way I’m always able to reproduce this; Take the car calmly to 60kmph in DRIVE (this is the point the car shifts into 6th gear) and suddenly hammer the throttle (WOT). The car will shift down to 2nd gear around 4,800 RPM and when it climbs into 5,500 RPM range will misfire. Again, only 1 – 2 times per cylinder. The same can be reproduced at 100kmph and having the car shift down to 3rd. The problem now only appears when the car is in automatic. (This has been the case since I added the RS4 fuel valve)
Interesting enough, if I put the car into manual and shift to 3rd, start at 2,000RPM and hold the gas all the way to 7,000 RPM I do NOT get ANY misfires. Of course, I was getting misfires previously when doing this on the dyno – but that was prior to the RS4 fuel valve.
So after eliminating the valve springs, it seems my only option is to start uninstalling the upgrades I did just prior to this issue. In a nut shell, this is the intake, exhaust and DSG software.
I’m going to start with the DSG software because this problem is occurring only when in drive… I’m going to have the unitronic dealer reflash the DSG on Monday with my original software… I’ll let you know how that goes!