RS4

B6/7 S4/RS4
#1

This thread is informational, I’m documenting my progress since information regarding misfires and fixes is scarce and different per member.

A little recap on the car and maintenance. Car has 104K miles, Carbon clean, JHM Spacers, JHM 6 Rib Kit, Heater bypass, new spark plugs, was done at 99K miles. And fuel filter was replaced at 103K miles.

Having an issue with the car now and don’t want to throw money, was thinking injectors but it might be a combination of things. this is a rough summary of todays events.

  1. Replaced Rear 02 Sensors with (2) new Bosch units for Emissions testings.
  2. Drove around a lot so the car could adapt since I didn’t know or could not find anything related to setting readiness on RS4’s
  3. 1 hr later car is ready for emissions testings
  4. Car is backed up onto emission service station ramps and within seconds falls on its face
  5. Tried starting the car, once car was level again and CEL popped on, pulled codes and got a code for N276 Malfunction.
  6. After car started we cleared the codes and drove it, no issues.
  7. Because of the codes we were going to have to drive around again to set readiness, but decided to Contact ROSS Tech instead with assistance on setting readiness manually.
  8. ROSS Tech on the phone guiding me through the steps for setting readiness, everything going well. Basic Setting (Value 71) Emission Reduction = PASS
  9. Next, Basic settings Value block (34) Lambda Control, with foot on the brake pedal, use other foot and press the accel pedal until 2K RPM and hold. (this is where the car acted up)
  10. Car is stuttering and misfiring while trying to set readiness with a flashing CEL, so we back off the throttle.
  11. Contacted Jimmy Bones for better VAGCOM assistance, and we were able to monitor misfires at idle and load.
  12. Don’t remember the block values but I was seeing constant misfires on cyl 5, 7, 8 with a count of like 300+ each cyl.
  13. Initial thinking is injectors, Jimmy performed a Carbon clean on my car 5k miles ago with new plugs, and other parts. (Fuel Filter was replaced 1 1/2 wks ago)
  14. thoughts?