So I recently install a second inline fuel pump from SteveAZ, it seems to be working great and I had no issues for about 3 days until I drove up to about 9000 feet ASL in aspen colorado. There I was in town but they dont have E85 near by so I took a 5 gallon gas can with me. The can had E85 in it from a little over a month ago and measured in at 70% ethanol.
After I added the E85 from the can I starting getting a stumbling issue where at partial throttle I would lose all power for a fraction of a second and then it would come right back. Once I got back down from high altitude the problem seemed to go away for a little while and then came back. I filled up with about 1/2 a tank of E35 (what I normally run) when I got back down to denver, however I havent gone through an entire tank of gas yet sense I put that E85 from the can in.
Anyways, frustrated I pulled all the spark plugs and found cylinder 6's plug was bent, the overhang was literally bent to the side... Not sure what was going on there, but I bent it back into place and gaped it properly (note these are NGK's). Nothing wrong with any of the other cylinders.
I also pulled the LPFP just to take a look and did find one of the power lines not completely plugged in so I pushed it all the way in and then zip tied both power lines for the new in series pump in place so they couldnt move.
I then drove the car again, and found that it was still stumbling.... so I decided to take some data logs with my COBB. I have the VRSF stepped 5", VRSF DP's, BMS DCI, running E30 map.
Here is the data log that appears to show what is going on:
http://www.datazap.me/u/shushikiary/...log=0&data=1-7
It appears to me that the AFR is going really high for both banks when the car "stumbles" Given the length of time that the AFR goes high it seems like I either lost all fuel or the fuel would simply not burn. The HPFP pressure is great, so is the LPFP pressure, so unless I couldnt flow fuel for some reason yet somehow still maintained proper pressure (which doenst make sense, the pressure should drop if I wasnt getting enough fuel I would think) the only conclusion I can draw is that some of the gas from the E85 gas can was bad.
I should note that when I used the E85 can a month ago it was in buena vista and it had rained just before I used it, I only used 1 gallon out of it, so there was about 1/4 of the jug of open head space with possibly high humidity air in the can for a month, so I'm seriously wondering if perhaps the E85 picked up some moisture out of the air and that is what is causing the problem.
The car does throw codes sometimes when it happens, but its almost always been "fuel pump plausibility" the silly P2AAF code, I did get one code that was "cylinder 6 miss fire with cut-off" P2B3A.
So I just want to see if anyone else has any idea's as to what might be going on.