So the question is-do you ever notice momentary upspikes towards a lean AFR on the UEGO? And what typically causes them?
I *may* possibly have a misfire condition with my car that is showing up on the wideband. What I've done here is log the AEM wideband output on my emanage/e01. Sorry for the bad cell phone pics:
http://i87.photobucket.com/albums/k134/ez1_03/DSC00528.jpghttp://i87.photobucket.com/albums/k134/ez1_03/DSC00525.jpgI'm trying to figure out if what I'm seeing is an artifact (perhaps due to electrical noise) or a true misfire condition. It's shown on both the guage as well as the output line which I logged in real time. The car is at idle in these pics. The bottom axis is time (20 seconds long) and the vertical axis is A/F ratio (11 on bottom, 19 on top.) See those brief upspikes overlying the normal cycling of the wideband? So you see it sometimes happens once every 8-10 seconds. Here's a normal tracing with no events:
http://i87.photobucket.com/albums/k134/ez1_03/DSC00526.jpgIf this is a misfire, it's not something I can sense at idle. I don't hear it or feel it. And when I'm accelerating, I feel like there *might* be a misfire, but it's almost below my threshold to detect because of the feel of the suspension/low profile tires that make the car feel bumpy already. I just can't tell. Just FYI, the car is a 1999 nonturbo eclipse. I've changed spark plugs, the coil pack, and changed wires, but the spikes are still there.
TIA!
