Fingers

Misfire still not resolved -- HELP PLS

My misfire issue is still not resolved

I've been dealing with this for quite a while with my s5 t2



Symptoms?

1. Misfire when revving in neutral above 1k (not backfire, just misfire)

2. Misfire upon decelleration when revving in neutral (series of popping sounds)

3. Rough idle upon warm restart on a hot day (i imagine due to heat soak), goes away after 10 seconds of driving.

4. Low vacuum upon warm restart/hot day. (14 in/hg as opposed to 17-19 in/hg normally) Although the AFM reading on the AFC shows more flow than normal idle.

5. Intermittent loud buzzing sound from the ACV. Seems to be related to misfiring, but i can't figure out how.



What have i done?

1. Set the TPS 104132519073590813906908136 times

2. Pulled the BAC off and tested it, works flawlessly, and is clean as a whistle.

3. AFM is not sticking.

4. Replaced vacuum lines around acv, all except the bottom one which i couldnt reach.

5. Checked throttle cable for stickyness/adjusted.

6. Checked dashpot

7. Re-did grounds (two VERY good grounds, in addition to the stock grounds)





Oh by the way, the issue diminishes when the A/C is on (BAC giving the engine more air).





Suspects?

A) Injectors

B) ACV diaphragm busted



No backfires when shifting, shitty MPG.





Can anyone please shed some light on this?

FCmaniac

I'd say ACV

87BADASST2

Have you checked your crank angle sensor. It almost sounds like your timing is off a couple degrees. make sure your leading and trailing coils are not burnt up. I would get a timig light and see if your timing is correct. it could be a injector but I would research other areas b4 you pull them out.