Breaking up under load at higher RPM's
11-30-2014, 09:40 PM
#11
Member
Thread Starter
12-01-2014, 12:10 PM
#12
Member
Thread Starter
So I took the time to measure the resistance amongst my coils today. Here's my results:
Cyl 1 - 1.1~
Cyl 2 - 1.1~
Cyl 3 - 1.1~
Cyl 4 - 1.1~
Cyl 5 - 0.8~
Cyl 6 - 1.0~
Cyl 7 - 1.0~
Cyl 8 - 1.0~
If anything, I would find it safe to deduce that my mystery coil would be cylinder 5 since it's the only one with any real difference from the rest. Would anyone like to add their input?
Cyl 1 - 1.1~
Cyl 2 - 1.1~
Cyl 3 - 1.1~
Cyl 4 - 1.1~
Cyl 5 - 0.8~
Cyl 6 - 1.0~
Cyl 7 - 1.0~
Cyl 8 - 1.0~
If anything, I would find it safe to deduce that my mystery coil would be cylinder 5 since it's the only one with any real difference from the rest. Would anyone like to add their input?
12-01-2014, 01:05 PM
#13
Mark
iTrader: (1)
thought you said coils are either good or bad ?? what's the min and max for a good enough COP ??
12-01-2014, 01:15 PM
#14
Member
Thread Starter
Like I said, I was always under that belief. Never said I was right or wrong. So to answer your question, I'm not 100% sure. But from what research I've done, that miniscule difference could account to windings that are starting to weaken. It would just be kinda crappy to toss $60 into a new COP and that not rectify anything.
12-01-2014, 04:43 PM
#15
Senior Member
I'm not trying to be a Negative Nellie, but bench testing a coil won't necessarily give you usable results. As the coils fire, they generate heat. Any heat will expand the materials within the coil. This can cause connections to open up, causing the coil to not operate properly. Testing resistance will only tell you if a coil is definitely bad, not if it's on it's way out. You may however get lucky though. I would try to find a used, known to be good coil for cheap instead of spending a bunch of money first.
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JByrd825 (12-01-2014)
12-01-2014, 05:07 PM
#16
Member
Thread Starter
I'm not trying to be a Negative Nellie, but bench testing a coil won't necessarily give you usable results. As the coils fire, they generate heat. Any heat will expand the materials within the coil. This can cause connections to open up, causing the coil to not operate properly. Testing resistance will only tell you if a coil is definitely bad, not if it's on it's way out. You may however get lucky though. I would try to find a used, known to be good coil for cheap instead of spending a bunch of money first.
Anyhow, you're totally right. I know that running real-time is the only real way to make this occurrence happen, but I thought that maybe I could find something prominent with a bench-test. Your suggestion with a donor coil will likely be my best bet. I just need to get my hands on one.
12-02-2014, 08:12 AM
#17
Good morning, all. I've got a nuisance issue that I'd like some input on. I have a 2008 FX2 SCrew, 5.4 3V Triton. Within the past week or two, I've noticed that she breaks up a little bit when I have to heavily accelerate, or hammer down on the throttle. It doesn't feel like a transmission slip, but more like a miss in either ignition or fuel delivery. My fuel filter is fresh, FPDM was replaced this time last year (FoMoCo part), plugs were changed at 72K when I bought her but I'm up to 119K now. All coils are original, and she's never once thrown a code for the entire duration of my ownership. Upstream O2's are new. As well, my TB is cleaned regularly. I'm psychotic with maintenance, so I'm not exactly sure as to what could be my issue. Would anyone here like to chime in with any suggestions?