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Nope. Basically I gave up by putting the car back in closed loop but retaining the calibrated MAF and VE tables.

The two things keeping me from going SD are the issue this thread is about, and...

OK, I made the recommended changes and no longer get reduced performance. Thanks!

My AFR at idle was very rich, and all accounts that I've read seem to indicate that a cammed car will typically...

I set the bias table to 0 and the filter table to 1 and I still run lean for a few minutes after a hot start, should I take this to mean my IAT is heatsoaked? Eventually, once IAT is pretty close to...

So for the P0068 test is it checking that the MAP reading corresponds reasonably well to the TPS reading? As in, a poor vacuum at idle would cause the test to fail? Will definitely try your...

Have you ever gotten "reduced performance" mode when tuning idle? The guidance is to command lower and lower RPMs to determine airflow but if I command much below 900 it wants to fall into "reduced...

No joy?

Sorry for stepping on your toes. I was assuming that AFR at idle was relevant to tuning idle. More specifically that the AFR error at idle as compared to while driving indicates that the actual VE...

My second question does indeed make sense and is in fact relevant to the subject of idle tuning.

I have tuned my VE table to be accurate while driving. However, the same four spots in the VE...

So if I plug the MAF back in with these tables set to zero .. chaos will ensue?

Time scale: 10 seconds.

Log file attached; go to frame 3200.

Right now I'm running around 12 degrees ... so you're saying reduce the airflow and increase the timing?

Another issue I have is that the VE table cell for idle is also used in cruise, so I can...

How do I know where to start on the idle timing map? My cam is 238/242, 112 LSA, 10 degrees overlap.

Right now my idle airflow table is set to 9.5 everywhere 1200rpm and below, idle spark is...

My fueling never goes rich when I stab the throttle. It's going lean. It does not go lean as badly when I stab as when I apply it a little less quickly. The scan above is about 10 seconds long so...

OK .. while I resolved the really huge lean spikes from the original post, I still have some undesirable AFR errors happening that I just can't seem to get nailed down.

Here's what I'm talking...

I zero'd these tables: Corrected, Base, Current, Old, MAP, MAP Old, MAP Old 2, TPS, TPS Old, and TPS Old 2.

No apparent effects when running open loop speed density.

There are 10 tables that show up in Engine -> Airflow -> Dynamic Airflow under the heading "Prediction Coefficients", called Corrected, Base, Current, Old, MAP, MAP Old, MAP Old 2, TPS, TPS Old, and...

What do these do? Are they related to the "EQ <-> VE" program? Do I need to change them after tuning my VE table with WB?

Also: Zero'ing the final idle airflow table is something that might lead you to expect the engine wouldn't run. My guess is that because the proportional/integrative tables work by adding or...

5LE: What cam did you have in the GTO you were tuning?

I'm trying to figure out the idle for my 05 GTO with a 238/242 112LSA cam. I can get it to idle stably but it's not "smooth". It's not...

So .. I realize this is an older thread but I'll resurrect it for the moment.

I've been spending many hours tweaking my 2005 GTO, LS2 E40, with a 238/242 lsa 112 cam, headers, UDP, ported TB (with...

Alright. I dunno if it's a possible bug or what but I had the Dynamic Airflow high and low RPM's set to 8192 and 0 rpm respectively. In theory Dynamic Airflow shouldn't disable unless 8192 is...

From logging I can see that when "Air Calc Mode" transitions to "High Speed", the lean spikes get a lot worse. It looks like it switches from "Low Speed" to "High Speed" when I hit approx. 4200 rpm,...

Spark plugs look fine. They are NGK V-Power TR6's gapped at about .058" (which is notably larger than the stock .040 on TR5's).

I have an IAT breakout.

LSX378, to try to answer your earlier question, I'm not 100% sure but I think it's only happening under load. If I blip it in neutral it tends to go rich at first, and then lean as it runs back down...