Hey guys, I'll send $75 (via paypal, or snail mail if you prefer) to the first person who can tell me what needs to be done to fix my sputtering problem (after I see that it fixes the problem, of course). I have another thread on this problem, but to save you the trouble of reading through it all, I'll try to give a synopsis of everything pertinent to solving the case. This started about 3 months ago so I'm having a little trouble remembering the exact sequence of events.
I had it professionally dyno tuned @ 13psi with stock OS and MAP. I got stuck with an unfinished tune after some poor customer service (whole other story). He got WOT tuned great (about 11.2 afr), but it had a real rough spot around like 60%, but it was fine to drive. About a month later I was rolling down the highway and stomped on the gas pedal, and as soon as it built up some boost it started to sputter really bad. It feels like it drops down to a Prius level of power when the sputtering happens.
So it sputters when boost is built up, and not necessarily 100% throttle. I have found that it seems to NOT do it in 1st or 2nd gear, but only in 3rd and 4th. (maybe just because of greater load, since it spins in 1st and 2nd). Based on my scans, O2 b1 starts switching when it starts to sputter. It is VERY sensitive to knock, and it doesn't really show any KR while sputtering, so I don't think it is leaning out bank1 but rather intermittently shutting the injectors off.
So after a little while of trying to figure out the problem I decided to upgrade to the 2bar OS and MAP, to make life a little easier. Here's where it get weird:
1. About 6 months ago it began to NOT shut off when I would turn the key off. I could turn it off, remove the key, and it would just keep running. I tried everything I could to fix this problem, without success... until I converted to 2 bar, it magically fixed itself!
2. The tranny used to shift VERY hard no matter what I did to any of the shift tables... until I converted to 2 bar, it magically fixed itself! Even though all the trans. tables were the exact same.
But it did not fix the sputtering. I spent about a month messing with hpt and hard parts, but it still sputtered.
And then.......
Since I've been getting nowhere, I decided to go BACK to my 1bar map and tune, even though that's how it was setup when this whole problem started.
But NOW, it doesn't sputter!!!!! I wish I could say "problem solved" and move on, but it's never that simple is it?
As stated above, there is the issue with the shifts, and the "won't-turn-off" problem. AND now the AFR is looking way to lean at WOT, which doesn't make sense, because it was dead on when I had this SAME tune in it a month ago! I don't even know how to tune that crazy 30 section stock VE table.
Here are things I tried to no avail:
-new plugs .028
-new plug wires
-swapped coils from bank 1 to bank 2 (to see if scan showed the problem moving to the other bank)
-swapped injectors from B1 to B2
-checked fuel pressure (cruising=63psi WOT=bout 57psi)
-messed with every parameter that I could possibly think of
-pulled out my hair
Here is the original 1bar tune (no sputter, but has the other problems) and my current 2bar tune(sputters).
Sputtering in boost scan: look near frame 7,700
More sputtering: look near frame 12,500
Thanks!!!