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Tested for voltage. Seemed good when compared to known good plug connector.
Scanned again afterward and now #10 is showing value of 0.90% so it's limit isn't being tipped at >=1.43% anymore. Not misfiring anymore according to mode $06, although minor vibes still possibly present at idle. I say possibly as I don't know if I'm being overly sensitive to it now.
So strange. Compression issue maybe?
More soon when I've run through this tank.
Appreciate everyone's contributions to this long *** thread.
mine isn’t always perfectly smooth either
i suppose it’s possible reseating everything may have fixed a poor connection, definitely continue to monitor it for a few more days.
Mode $06 is a great tool, but at the same time it isn’t perfect and rough roads can sometimes be translated as low % misfires, but with the higher % you were seeing those were definitely misfires.
also every engine will miss occasionally, so I wouldn’t fret the real low %, just when it crosses the 1.4% threshold
whats your injector pulse width reporting? Those things fire so quickly it would be hard to hear if it was lazy. Not sure that could tell you anything or not, as it doesn’t report individual cyl.
Have you run some good cleaner through the tank along with a high detergent fuel, ie shell? Gumout all in one or gumout regain??? Even berrymans b12 is great. I personally don’t like Seafoam
Not sure what the injectors are reporting just yet. If I had Ford's IDS I'd love to see their relative flow report...
I've added three cans of Seafoam and one bottle of O'Reilly's own fuel cleaner as it was on offer. I'm all up for trying Gumout on the next tank though (do you follow their instructions on putting it on near empty tank and only fuel up 19 gallons?)
Will report back with a pic later showing a frayed braided cable. Wondering if this is my issue...
Not sure what the injectors are reporting just yet. If I had Ford's IDS I'd love to see their relative flow report...
I've added three cans of Seafoam and one bottle of O'Reilly's own fuel cleaner as it was on offer. I'm all up for trying Gumout on the next tank though (do you follow their instructions on putting it on near empty tank and only fuel up 19 gallons?)
Will report back with a pic later showing a frayed braided cable. Wondering if this is my issue...
The frayed braided cable would be one of the grounds, bad grounds can cause all sorts of odd electric behavior. Best to clean up and or replace any suspect grounds.
How does it appear this tank is doing following the plug change so far?
Okay. I looked at my data again and realised I'm getting values on all cylinders on the driver's side and nothing on the passenger. I went and did a visual. Didn't touch a thing. Scanned it:
I got codes PO356 & PO360. No CEL.
Forscan tells me it's an open ground, just like you say Tom. These codes just got thrown up as of this morning.
I opened the braid of that cable from where it's fraying and the cable insulation itself is intact. I've wrapped it with 400F heat shield tape to protect from where it wore against the manifold:
Code persists after clearing, so issue must lie elsewhere. It's gotta be the wiring as 4 out of 5 cylinders are being affected on the driver's side. Is the above cable the ground (if so, the only ground for driver side?)
I'm at half tank with 120 miles on the odometer. Expecting more than 240 though of course given how first half always races and then slows for second half.
They saw the codes and cleared them before their test drive. Took it out for 45 minutes driving whilst monitoring cylinder contribution results. No misfires.
They came back and did a visual, all okay. Also handled and wiggled all harnesses and connectors for anything loose. They had hands over a lot of different things.
Didn't charge me a penny when I collected.
Here's what Forscan threw up though on it's return:
...
Misfire Rate & Type A Threshold, Cylinder 1
TID: 53
CID: 1
Value: 0.00 %
Limit: <= 19.58 %
Misfire Rate & Type A Threshold, Cylinder 2
TID: 53
CID: 2
Value: 0.00 %
Limit: <= 19.58 %
Misfire Rate & Type A Threshold, Cylinder 3
TID: 53
CID: 3
Value: 0.00 %
Limit: <= 19.58 %
Misfire Rate & Type A Threshold, Cylinder 4
TID: 53
CID: 4
Value: 0.00 %
Limit: <= 19.58 %
Misfire Rate & Type A Threshold, Cylinder 5
TID: 53
CID: 5
Value: 0.20 %
Limit: <= 19.58 %
Misfire Rate & Type A Threshold, Cylinder 6
TID: 53
CID: 6
Value: 0.00 %
Limit: <= 19.58 %
Misfire Rate & Type A Threshold, Cylinder 7
TID: 53
CID: 7
Value: 0.00 %
Limit: <= 19.58 %
Misfire Rate & Type A Threshold, Cylinder 8
TID: 53
CID: 8
Value: 0.00 %
Limit: <= 19.58 %
Misfire Rate & Type A Threshold, Cylinder 9
TID: 53
CID: 9
Value: 0.10 %
Limit: <= 19.58 %
Misfire Rate & Type A Threshold, Cylinder 10
TID: 53
CID: A
Value: 0.10 %
Limit: <= 19.58 %
Highest Type A Misfire Rate & Threshold
TID: 54
CID: 0
Value: 0.39 %
Limit: <= 19.58 %
Highest Type B Misfire Rate & Threshold
TID: 55
CID: 0
Value: 0.12 %
Limit: <= 1.43 %
The values on 6-10 have changed as well as the limits on all cylinders. Code has not returned. does this mean an electrical gremlin persists somewhere if their wiggle test has affected these results? What about that "Cylinder Events Tested" value?
Currently sat between 1/4 and 1/2 full tank with 145 miles on the clock. Last time I reported that needle range up the thread some I had 185 miles before the plug swap...
This beast baffles me. That said, I'm not going to pass too much judgement on this tank, seeing as it's now skewed (plugs swapped at 1/4 gone, misfire on 10 for a few days... etc...)
