Recent content by greiswig
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Persistent misfire under load only
OK, I’m home and starting to delve into this a bit more. To try to demystify the results I’m getting from the GAP tool, I decided to disconnect some of the ignition coils one at a time from their respective plugs and record live values in GAP to see if I could spot a pattern. Reminder: can’t... -
Persistent misfire under load only
OK, here is the test, run with no load on the engine. You can see I futzed around trying to get it closer to 1500RPM before just leaving it at 1800 where it seemed to want to sit. I'm not sure what it tells me, TBH: Same graph with all the axes showing at left: -
Persistent misfire under load only
@jlglr4 are there any recommendations for how many seconds at each step (idle, 1500, 3000) to maintain for this test? -
Persistent misfire under load only
Thank you, @Rover Range for explaining that part. I assume, then, that the computer doesn’t care what is causing the misfire? @jlglr4 Thank you as well. I’ll give that test a try. And yes, indications are only one cylinder misfiring. I recorded a log where only cylinder 4 was misfiring... -
Persistent misfire under load only
One more piece of data from this, which I hope might point someone to what might be at the heart of this: this morning, when I was able to get it to misfire again (again, flooring it from 50mph), the misfire "stuck," with the engine running rough and obviously misfiring consistently right down... -
Where is this supposed to be bolted? (Part #EH22-13N850-FC)
I always appreciate your detailed insights, @Rover Range. -
Where is this supposed to be bolted? (Part #EH22-13N850-FC)
Back of manifold! That was my guess, based on where it was and the hole diameter. Many thanks! -
Where is this supposed to be bolted? (Part #EH22-13N850-FC)
This appears to be one end of a grounding wire, looking for a place to call home. Not sure when it would have been disconnected, and I assume this is unrelated to other issues I'm having, but I found it near the back of the intake manifold, and feel like hooking it up. Anybody know what the ends... -
Persistent misfire under load only
I'd be interested in seeing your evidence for this. It was my understanding that the GAP tool was developed with some input from LR, and it's in pretty common use by people here. -
P0170 fuel trim and CEL
Reviving a very old thread, because the issue was pretty persistent this last long trip. It seems like trips of a few hundred miles start the behavior up. I've attached a log I recorded when I believe this was reliably happening. You could clear the code in the GAP tool, and it would... -
Persistent misfire under load only
Yeah, that’s kind of how I was leaning, too, after lying awake thinking things over last night. But the timing of the plug change has me wondering. So here are my main questions: 1. Does anyone know why the GAP tool would show #4 misfiring, but the trouble code would indicate #5? Or more... -
Persistent misfire under load only
Can do, but it’s really odd that it is so load-dependent. If it’s running below about 90% load, it never seems to misfire. And if I force it to stay in 8th gear and floor it from 50mph, it’s slow acceleration, but no misfire. The other thing that may not be coincidence is that this is the... -
Persistent misfire under load only
Fuel trim screen shots, but again, this code hasn't reappeared today. It’s the misfire I’m more worried about today. -
Persistent misfire under load only
Which fuel trims in there should I be reading? There are many of them, and some seem to just report NA. -
Persistent misfire under load only
Correction: the CODE indicates cylinder 5, but live values seem to point to #4. (Plugs were all replaced recently) Any reason to think that either the code or the live values are reporting the wrong cylinder?
