Intermittent rapid rise in a/f learning

[dawkins20]

Very true. It runs a lot of timing in cruise and mild acceleration, so in higher gears on highways there is quite a bit of low level knock. But I've been getting more intense timing pulls at mid loads (1.2-1.6) pulling -4 degrees or more and making the DAM drop.

 

That was the trouble spot I had with the Cobb maps and an etune map also, so there is some fueling issue. Sometimes it is apparent as the logs show that the car is staying lean there and not following the map open loop fuel curve down fast enough, but other times I don't see a lean condition on the log. These log snippits were all from my drive home yesterday after testing the other MAF sensor.

 

DAM drop x 2

 

Lean open loop knock

 

DAM rise then drop

 

And yet again

[McDowell Performance Tunin]

Have you checked your cylinder roughness (per cylinder) misfire parameter, for each cylinder to make sure that looks normal?

[dawkins20]

Yeah. Nothing abnormal. No more that 1 counts intermittently in different cyls

[McDowell Performance Tunin]

log your o2 voltage too. See if it's looking out of the ordinary. Might as well see if something comes out of the parameters available

[dawkins20]

So, repeated a smoke test, all buttoned up, no leaks. Also tested fuel pressure, 38psi at idle, rising to 47ish with the FPR line pulled, so those look good. I'm thinking injector maybe b/c otherwise I'm out of ideas