Archived Intermittent misfire with P0305, injectors did not fix!

[crashnscar]

Symptoms:
Intermittent misfire with white smoke out of exhaust (more smoke when accelerating during misfire condition)
Intermittent hard to start
Occasional P0305 (cylinder 5 misfire), but not immediately/always when misfiring
Begins when engine returns to idle; will not begin misfiring once cruising on the freeway, only in stop/go situations
Can prevent misfire from starting by keeping load on engine (left foot braking with small load on idle)
When misfiring, I can disable injector #2, cylinder #5 with no apparent change in misfire. Disabling any other injector will result in running even rougher.

Clears up: sometimes randomly on its own, sometimes under braking, sometimes with a blip of the throttle, sometimes moving gear selector between P, R, and D
Frequency: anywhere between 10 seconds and 7 days between issues

What I’ve done over then past 1 month (7000 miles):
Replaced injectors + supply tubes, FCA, crank position sensor, FASS pump (failed in the midst of this saga), fuel filter and water separator, rocker box wiring harness for injector 5/6
Rail pressure and supply pressure are not abnormal during misfire
Tightened grounds from battery to body/engine, and engine to ECU
Killed each injector individually using SnapOn scanner, Cyl #5 Injector #2 sounds roughest when killed and takes many seconds to smooth out when turned on. Other injectors all smooth out within 1 second when enabled again.
Inspected A/C wiring
Swapped injector wiring harness between 3/4 and 5/6 with no change (still P0305)
Filled at all different gas stations, not all bad fuel from same station


Please help!

 

[Killer223]

are these new or reman injectors?

 

[crashnscar]

are these new or reman injectors?

Reman, but P0305 existed before injector replacement and the probability of getting a bad injector again in that cylinder with all replaced injectors is slim to none.

 

[cerberusiam]

Move the injector and see if the problem follows it. Are you sure injector #2 is cylinder 5? It is in the firing order but how the tool interprets that is another question.

 

[crashnscar]

Move the injector and see if the problem follows it. Are you sure injector #2 is cylinder 5? It is in the firing order but how the tool interprets that is another question.

Positive, the SnapOn scanner specifically said "injector 2, cylinder 5".
I'm going to swap injectors in cylinder #1 and #5 tomorrow, as well as do a compression test on those two cylinders during the swap.

I don't expect the injector swap to reveal anything, as the P0305 code existed before and after the injector replacement.

 

[BLNRAY]

Engine harness or ecm connector pins

 

[crashnscar]

Additional information from the 5-6 hours I put into this today.

Newest clue is that with the crank sensor unplugged, it will not get into the misfire condition. Sometimes it will start with the crank sensor unplugged and throttle wide open, sometimes I need to lightly plug in the crank sensor to get it to fire (with misfire condition), then unplug it and rev the engine to clear up misfire condition. After that, I can drive around as much as I want (so far) with no misfire.