I've been doing research for months about the lean spike I have when I mash the go pedal. It seems that this topic has come up many times in the past. I am using 6E.

The lean spike is very short and occurs as I put the pedal to WOT. The lean spike jumps to 17-18 on the wideband. It doesn't last very long, but the ECM is picking up knock counts.

Some things I have read say it is going to happen regardless because my foot can add air faster than the ECM can add fuel. So I am trying minimize the effects. Normal driving and WOT are dialed it.

I'm looking at AE, and the stickies are a great help for understanding what each table does. I have made changes and have recorded the changes in my logs. What I cannot find is what/when does AE actually occur in 6E?

I have noticed that when I have the car in 1 (auto) and gradually increase the throttle the AFR tracks with it going lean. So I was looking at something related to TPS. I'm not seeing it.

I have however lowered PE to occur at 1.25 volts at the TPS, then I smash the pedal, the lean spike happens, isn't as severe, and the ECM does not pull timing. The AFR when I smash the pedal is in the low 13's. Before I lowered PE, I was seeing AFR's in the 15's during acceleration.

I woudl like to take care of this to the best of my ability. I understand that if I have the car in D and mash the pedal, I may never overcome this. I am thinking about running higher octane fuel to eliminate the knock counts?

Sorry this is so jumbled. I am at work and wanted to get intelligent people looking at my issue asap.

Thanks,
Craig

 

Not exactly sure how $6E works as far as AE but there are a couple tables that affect the magniture verses duration in my EBL. Kind of dovetails with onset of PE so that continuous enrichment assuming you get to a PE. I recall I adjusted that table to help the lean spike. Having heat in the intake plenum is beneficial.

Now I allso added throttle follower fuel as well. Do to my non stock intake as to lesser extent my non stock heads I found this to me of maximum help. I fact I believe I continued to add msec by the hundreds as each addon change helped. Now I do see an slight enrichment in WB(13.8 from 15.0) while berfore I saw the lean spike.

 

I've read through at least two threads in which you were working through your problems.

I'm not sure AE is the issue. I think it needs work, mainly when it is invoked. I have manipulated the tables for more fuel, and longer duration, but when it occurs it is too late.

This is why I changed PE, which I could do easily to try to counter act the lean spike. I know it isn't a permanent fix, more of a proof of concept. I also might run higher octane fuel. I am mid 10's in compression running 93 octane with AL heads.