Okay, I have some info.
I live at 5100’ just FYI.
My AFR settings are 14.0 at idle, 14.5 at cruise, 12.8 at WOT.
Yesterday with total timing set to 3500, it was misfiring at 3500 really badly popping and wouldn’t shift. That’s why I went up to 4500, to make sure it was all in at the upper rev limits. I assume there’s a curve that it bases this on in addition to the map sensors and vacuum and stuff.
Today It was running like a raped ape on surface streets.
I got on the highway and at 65mph if I even let slightly off the gas to part throttle it sounded like loud popcorn then a pretty MAJOR single backfire. The popcorn wouldn’t stop until I got back on the gas. Pulled over, googled, dropped my total timing to 30*, and bumped up to 5000 for total timing to be achieved.
As soon as I did that, the issue almost completely disappeared. No popping and no explosions if I coasted.
However it is still doing what it has done since the EFI was installed. If I let off to 0 throttle then even slightly touch the gas after coasting for a second or two I get a pretty decent pop out the tailpipe. Pretty loud. It has always done that to some extent, but at this juncture it seems to be worse than before.
So I need to play with this. It sounds like those settings you mentioned above absolutely won’t work for me, considering that when total timing was acheieved at 3500 my truck wasn’t running correctly. It was missing.
So aside from the decel pop the current settings are allowing me to drive it without any of the issues I used to have
It didn’t cut out. This is the major one that was killing the drivability.
It doesn’t really actively hunt, it seems to try to settle down to idle speed a little early, on a cold start then come back up for a second then smoothly settle in at around 700rpm. So that seems less of an issue now.
If I can get that pop on deceleration figured out or at least reduced a bit, I’ll be happy
Well it ain't just the smoke and the traffic jam that makes me the bitter fool I am But this four-wheel buggy is A-dollaring me to death.
For gas and oils and fluids and grease, And wires and tires and anti freeze....And them accessories, Well honey, that's something else.