Originally Posted by
steveo
not normal. anything into WOT or power enrichment should almost immediately drop below 14:1. ideally below 13:1. you need more fuel and maybe a bit of fuel for tip-in too (there's acceleration enrichment parameters to replace 'pump shot' on a carb for that kind of stuff)
when you drop off the throttle hard, you're going from no vacuum to extreme vacuum for a second, so odd fueling for a very short time is normal, also o2 measurements in this kind of situation can be whacked right out. you need to be more specific when you say 'eventually'. is eventually two records? twenty? one second? one tenth of a second?
yeah that's a good thing, it's DFCO (decelleration fuel cutoff). it's a mode that increases engine braking and fuel economy during engine braking that's hard enough. one thing sometimes you have to play with are the parameters related to transition between DFCO and normal running (if it 'jumps' or 'hesitates' when entering or leaving this mode). there's a lot of math and tuning done in the computer so it'll happen without the driver noticing
it should cycle between approx 900mv to approx 100mv. if it's not going lower than 400mv when cruising, something is wrong.
where are you measuring it from?
I realize these are just ballpark figures, but does the operation look "relatively" normal?
I fly aircraft so my mixture settings are not nearly that dynamic, or precise.
yeah, probably, what's the error code that's causing the check engine light?
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