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very nice! i was looking at these in the 1050 model. I think the 1750 are best for e85 correct? I'm runing pump gas, with water/methanol injection. 1000cc may be enough.
Yeah I bought mine knowing I would be running e85 most the time.
I'm getting set up for this coil/spark test now... I was kinda wondering if it could be a wire or a coil? or if either of those could cause the issue I'm having with fouling the #3? time will tell. reporting back soonThe fuel in the baggies look fairly close to each other
While you're testing things, you can test the spark using the same MS testmodes menu. I doubt there's any problem, but it's another bit of data. You'll need to lay 4 spare plugs out on a grounded sheet of metal - maybe the valve cover? or maybe a sheet of tinfoil? The spark, and injector, test setup allows you to test a specific coil/injector, or to sequence between all 4. For the spark test, start with a really low dwell time, say 0.3ms, and adjust it up until you get a nice bright spark. Then compare the spark on all 4 plugs.
Going back to the suggestion that maybe the head was ported and broke into an oil galley, or there was a casting defect/void, you could unplug the injectors, remove the plugs, and crank it for a while to build&hold full oil pressure. Let it sit for a couple minutes then use a borescope to look at the piston tops to see if there's any oil accumulation.
Maybe the engine experts can comment if a broken oil ring could cause the fouled plug, but still have very good compression and leakdown numbers?
Damn Kenny I wish i had done this while the intake was still off... I already did some necessary cleanup.. (installed a billet breather box from sts thats been on my shelf, and pulled the solid third motor mount in favor of a soft third motor mount. the vibrations have been driving me crazy) I know this is going to be something simple too... I'm just so at a loss. I do so appreciate your input and everyone's willing ness to get through this with me.
Untitled by turbojose, on Flickr
Untitled by turbojose, on Flickr
That's strange, and a little worrisome, but I highly doubt it's related to the fouled plug. If you're selecting a single plug to test, not seq, it really should be sparking only that plug. What was the dwell time setting? I almost wonder if there's a bug in the MS3 spark test code. [If you ever do the spark testing again and see the errant sparks, you could try unplugging the coil under test and see if the other sparks go away. If they do, then it's probably an electrical EMI noise issue from the exposed sparks.]
I do have the test for spark still staged. I can try again like you said to determine if I have even more issues. lol. It’s just one problem after another. I will say that I gwltGreat spark picture!
That's strange, and a little worrisome, but I highly doubt it's related to the fouled plug. If you're selecting a single plug to test, not seq, it really should be sparking only that plug. What was the dwell time setting? I almost wonder if there's a bug in the MS3 spark test code. [If you ever do the spark testing again and see the errant sparks, you could try unplugging the coil under test and see if the other sparks go away. If they do, then it's probably an electrical EMI noise issue from the exposed sparks.]
What coils are you using, and how/where are the +12v and ground(s) wired?
This all is sounding like you might need to check and make sure your ground path is good.
Make sure the head to firewall ground strap is ok. Doesn't matter how well it's grounded to the head if the head isn't grounded. Maybe run a temporary extra ground to be absolutely sure - jumper cable from intake to battery ground or a strut bolt?
Great spark picture!
That's strange, and a little worrisome, but I highly doubt it's related to the fouled plug. If you're selecting a single plug to test, not seq, it really should be sparking only that plug. What was the dwell time setting? I almost wonder if there's a bug in the MS3 spark test code. [If you ever do the spark testing again and see the errant sparks, you could try unplugging the coil under test and see if the other sparks go away. If they do, then it's probably an electrical EMI noise issue from the exposed sparks.]
What coils are you using, and how/where are the +12v and ground(s) wired?
I'm going to run through the grounds tonight and report if I find anything stupid going on. I believe i have a large gauge ground running from the head to the battery as well. I wouldn't put it past something coming loose. its been on gremlin after another.
sorry I missed the dwell info on this earlier. I was running the test at 5ms of dwell, thats where the spark looked the best, and I was trying the test at different RPM levels between 1600rpm and 7000rpm. and the errant sparks happened in all testing RPM's Maybe i should reflash the firmware? i did notice when i pulled some logs from the sd card, it wasn't entirely usable. maybe that was related to a bug in the firmware or a bad upload. I did flash the firmware about 3 months ago. maybe my problems can be traced back to that last upload.Great spark picture!
That's strange, and a little worrisome, but I highly doubt it's related to the fouled plug. If you're selecting a single plug to test, not seq, it really should be sparking only that plug. What was the dwell time setting? I almost wonder if there's a bug in the MS3 spark test code. [If you ever do the spark testing again and see the errant sparks, you could try unplugging the coil under test and see if the other sparks go away. If they do, then it's probably an electrical EMI noise issue from the exposed sparks.]
What coils are you using, and how/where are the +12v and ground(s) wired?
I may need some instruction on reloading firmware. I know I did update it about 3 months ago, but maybe thats why my last logs i sent to you were unreadable? I think I should flash it again for good measure.yeah that's odd, but I haven't ever run a test like that either. I wonder if it's over-dwell discharge on the other coils? (it should be reasonably consistent though if thats what it is, so maybe not)
I tend to think it's related to the test more than normal reality as well, but that is interesting.
in terms of grounds, I would check and maybe run a bigger ground from the engine straight to battery negative if there is concern about insufficient grounds. The injectors occasionally triggering is also very strange.
dumb question, is the firmware on the ms up to date? I'd be surprised if there was such a bug floating around in there, but hell we're in it this far
Hey Bob. quick update on the spark testing.... I was tracing some grounds down, and although i increased the size of the main ground from the head to the battery. it was a 10gauge, and I up'd it to an 8 guage, but it looked liked it was great. there didn't appear to be any issues with the previous grounds.
Untitled by turbojose, on Flickr