p0304 miss on cylinder 2?

[95SleeperAcheiva]

anyone ever seen this?!
ecu pulls p0304 code, it should be a miss on cylinder 4. by pulling fuel injectors and watching datastream, codes dont match to the cylinder.
actual cyl 4 pulls misses to cyl 2
actual 3 pulls misses to 4
actual 2 pulls misses to 3
cylinder 1 is the only one that matched up.

This si the wierd shit that I get to find on a daily basis and I wonder why I'm balding.

[60dgrzbelow0]

If you had an extra PCM/ECU Box to throw in there... it would eliminate that problem right off the bat. The attached link will let you plumb the depths of the OBD-II Site and their Forum for more information on P0304 problems as well.

http://www.obd-codes.com/forums/search.php?sid=a518e453dc651e072d35ba3fba511da1

EDIT:

Oh...and about that "Balding" issue (assuming your question was not a rhetorical one)... Only REAL MEN go bald. The biological reasons for this have to do with a little gene donated by your Mom's XX chromosome that makes the hair follicles in your scalp sensitive to the presence of DHT (DiHydroTestosterone) and shut down hair growth whenever DHT is present. DHT is metabolised from the normal production of the Maleness Hormone: Testosterone. The reason some men go bald is that they either produce one hell of lot of "T" (or for example... inject cortical-tropic hormones for body-building) ...Or... they have a naturally dominant baldness gene donated when their mother's 23 pairs of chromosomes combined with their dad's other 23 pairs to make their Bouncing baby Boy.

If anybody doubts that this is all true... just go back in history in the time of "The Renaissance" ...for that is when the Catholic Church decided to actually castrate the best male choir singers just to keep the chorus intact whenever their members got close to puberty...risking the loss of those high soprano solos. They realised only later why.... there is no such thing as "Bald Castrati". Years later, somewhere down in South America... there was a doctor using a new drug called "Finasteride" to treat a male patient for BPH or Benign Prostatic Hyperplasia AKA Enlarged Prostate...and during the course of the treatment... the large bald spot on the top of the man's head gradually began to lose acreage. And from that, "ROGAINE" emerged as the first effective treatment for MPB (Male Pattern Baldness) albeit, at a much lower dose as a topical application. Of course they made pant load of "The Elu$ive $pondulex" $elling this drug.

[95SleeperAcheiva]

Well, Now you're scaring me. Into cars and full of medical history and knowledge. I bet you're a riot at the coffee shops! :P

About 4 weeks ago we had an ECT code that wouldn't go away, turned out it was a bad ECU and replaced it with new.
I had swapped out the entire coil pack assembly with a known good one from another engine build and that eliminated any coil issues. We ohms injectors and tested the harness, all good. I even spray pattern checked the injectors and tested flow. I ran it for 2 hours up and down the road, nothing. I stamped it fixed and sent it on it's way.

It came back, missing on cyl 2, intermittently, throwing p0304.
I then swapped injectors from cyl2 and 3, and changed the o-rings for good messure on all 4, found one cracked.
ran her for 3:20, not a damn miss anywhere. next day ran her for 2 more hours, drove her hard, I got 2 misses on current data immediately after hard accel to 60 during decel.
In other words, floored it to 60, let off gas, 2 misses on current data on all cyl. Not enough to throw a code or post in history data. It was doing this 4 weeks ago too after I thought I fixed it.
I did find something else last night, I put a vacuum pump on the FPR and it won't hold vacuum, it bleeds down pretty quick, I'm throwing one in her today and I'll post results.

Thansk for the help btw

[60dgrzbelow0]

I've see enough of your prior posts to know better than to suggest this Old Saw of an idea to someone with your experience... but...WTF...FWIW ...If replacing the FPR doesn't do the trick...and you can get that car either on a Moonless night or when you can use several blankets to temporarily shroud the hood...you might have someone sit in the car raising and lowering the RPM several times to see if you can detect any "Blue Lightning" traces from under the engine area that would let you pinpoint either a cracked or defective spark plug wire/Connector or a funky coil pack or ICM connector as the culprit. You would be surprised at what you might find!

[95SleeperAcheiva]

It's a 2000 Z24 2.4 Quad 4. I couldn't see the plugs without sitting IN the motor. :P
Thats why I changed the whole coil pack set with another known good one. from boots to ICM. Threw in a set AC plugs the first time, a little Marvel in the gas, and 92 Octane too, just to try and clean up anything. I didn't get a chance to go to the shop and put the FPR on there yesterday, I'm taking a 4 day weekend for x-mas. Sometimes it's nice to call your own hours.

Merry Christmas guys.

[95SleeperAcheiva]

Installed FPR, no change, still get miss on decel...on all cylinders at random.
I'm throwing this out there, I put a wave meter on the crank sensor, it tested out good during crank, the leads aren't long enough for me to hook up to it and run down the road. Seeing as this is intermittent....you think that, or is it possible, that this is my problem? I really dont want to throw parts at this thing, but everything I check, pops good, what am I missing?

[MidnightriderZ24]

have you checked converter backpressure?? another thing you could pop the timing cover off quick and check for slack in the chain. is the coolant level ok?

[95SleeperAcheiva]

I found the problem by accident. Finally got it to sit there and run with the miss at a constant. Ran through every check, spark, injector pulse, compression, etc...
During one of the idle periods the ECT "traction" light came on while sitting stationary. Wierd. I grabbed the harness to see if the wires to the trans were loose and the miss went away. I dropped the harness and the miss came back. I then found at various spots on the engine harness I could wiggle the miss away and wiggle the miss to return.

Replaced engine harness, $396. It's been running fine ever since. Drove me nuts I tell you!

Thanks for the assist.