I'm having the below issue....
(original thread on msextra.com http://http://www.msextra.com/forums...=34600&start=0
At 1894-ish (2nd manual mark) I go to WOT, AE, (which needs tuning!) kicks in and the AFR's drop as expected, where they shoot up to a solid 14:1 - which is way too lean for my liking and I was the point of the datalog - to tune out , suddenly they drop to 10:1 for no obvious reason. Then pop back up to 14:1.
From what I can gather it seems it's possibly an injection timing issue. It's only
happened with sequential injection.
it's definately NOT a wideband issue, nor is it noise on the injectors causing them to spike at that RPM. I've scoped the injectors and they're fine.
It happened on my old and busted 96 engine and my new 2001 engine.
I've cribbed the sequential injection settings from DIYAutotune's DIYPnP basemap, this uses a fixed injection timing of -350deg. I'm hoping (nay praying) that I can resolve this by enabling the injection timing table and in the 2-3k zone change the timing from -350 to something which stops the above.
I've not a clue
on where to start though, should I start at -300 or is that too big a jump? or should I roll over in the other direction and start at -360 -> 50deg?