Wow, 2 whole weeks since my last update! Oh well, it has been hot and I have been either sick or dealing with family stuff so not too much to report. I have an 18 year old son that decided he is in love with a girl 1,200 miles away (over the Internet) and spends every waking minute thinking of how to leave home. Despite the fact that we signed him up for a 100k education!!!!!!

Good grief!

Well, the last two weeks have been pretty frustrating. I've had a small amount of time to fight with the "Tip-in" issue and have been through pretty much every conceivable tuning strategy. It ends up that I had a few things going on all at the same time. First off, the AEM is very finicky and didn't like the way I had the crank sensor wired. I ripped that out and started over, then in the wake of everything listed above ended up not following my own strategy and wired it wrong a second time. All while thinking I just made it better

This caused me grief as I then ran into a new strange behavior at idle and while cranking. Anyway, days later and in between hazes, i discovered my problem and corrected it promptly. Even then, with (2) perfect twisted pairs sheathed in shrink tubing I still wasn't 100% happy. I ended up having to perform the "resistor mod" to clean up the signal to my liking. I also ended up moving some grounds as the AEM didn't like the sensor ground I was using.

R-compart made a really spectacular wiring diagram but I am going to have a few edits with things I've found along the way.

Then when these changes didn't address the tip-in issue 100% nor did converting to a MAP based tune and disabling the 02 sensors, I noticed a weird behavior with the fuel trims. I kept seeing the STFT's read for a few minutes then stop and go to zero. The previous o2 sensor heater code I was throwing went away with the ground change and better wiring. Therefore I had not noticed this earlier as there was nothing to investigate down O2 alley at the time. However, that proved wrong when I connected both o2 inputs to the one good sensor and the trims started functioning normally as long as the car was running.

So what I'm left with at this point is a MAF based tune (just plain easier to deal with short and long term), O2 inputs to the AEM disconnected, and (1) bad O2 sensor. I ordered a new one that should be here Friday so I can resume.

Next on the agenda is installing the new O2 sensor and re-connecting the O2 interception of the AEM so I can change the A/F in between closed and open loop. Then I should be good to go.

I can tell you this much, I've dissected the tune on this thing about a 100 different ways! In the end, no amount of time is wasted going down these rabbit holes because in the end I learn something with each dive