- Dec 28, 2008
No what I said was I run low octane UNLESS i've got some tuning going on. 91 exclusively with the advanced timing. My top end is just dandy.well I think I would have tried the air intake sensor relocate by now just because they say it improves starting. not saying thats it for you but just something I know I would try in your shoes. Also I think you've pissed this sled off big time running that fuel. EFI should compensate for elevation and lean the fuel spray. 84 is way too low imo. The one time I ran corn premium I noticed lazier starting and more backfires that ride and a couple rides afterwards too. It takes a couple tanks to flush that crap out of there completely. No bueno.
Also you said you ran a hillclimb tune on this thing with that fuel? broooo... Id seriously check your top end out.
It's not an octane problem. This is the third zuke motor I've had, and like the 9th sled I've had at this elevation. And the 91 up here sits in tanks much longer and I've already had two friends blow up motors 20 feet from a parking lot buying 91 from the same station one morning. I don't risk it and riding primarily above 8k, it's a waste of money. My sled actually runs worse on 91 really high. The 91 rec is for safety at sea level and I do buy it when I get lower. These sleds have knock sensors for a reason. Also like I've said earlier, I've run tons of tanks of 91 through it too and the problem still happens. It's not the fuel unless you want to talk about vapor pressure of each octane...that is very slightly different.
The sled starts and then goes dry. After the zillion pulls I've become accustomed to, hot stagnant air should be cleared out. Plus I end up with the hood off half the time it does this so the air temp sensor isn't even part of the equation. I suppose there could be a scenario where it gets a hot read, cuts gas, and then it won't get the initial ignition any more on dry cylinders. But if that's the case, it should eventually pump enough fuel down the line just like filling it up initially.
summ8rmk: I tested the voltage to it when when I switch the fuel pump, then again when I switched the entire main harness. It's fine. I haven't checked the injectors though. Let me see what my fuel line relocation does. I'm trying to narrow differences between the M-series and these sleds, because it only became a problem with the proclimbs.