Could someone explain why this is happening? or if its normal behavior?

During acc. ( TPS 50%) I first go rich then suddenly it drops dead down to lean? is this when there is no more AE (delta TPS/MAP)? and I have to change VE and WOT AFR to get it to stay rich all the time?

Se scan.....

 

Looking at the data before the cursor (center of graph) I see the TPS and MAP suddenly increase. The injector PW is also at a high level.

The TPS then starts to taper off followed by a sudden drop in injector PW. Not a big drop, but a drop.

I'de say that the ECM was in PE mode and then exited PE mode. As for AE, it is normally terminated on a closing throttle.

It can help to graph a smaller portion of the data (expand the area of concern), along with checking status bits to see what the ECM is doing.

RBob.

 

THX!

I looked at the exact point of the drop off BPW/O2 and BLM enable is going "1" and before its "0" so I guess I'll have to add some fuel in the VE table?

/N.

 

Possibly, move the cursor to the left right after the PW drops off (PE exiting). Then check if the 'Decel Lean' (DE) flag is set. With the dropping TPS & MAP it is possible DE mode is being entered.

RBob.

 

It hits DE mode for 1 datapoint but its 6 datapoint after BPW has been lowered so its not that.....

/N.