Lean Spike

[cyipher]

I recently bent a rod in my trickflow headed 6.0 so i threw in a stock headed 5.3 in its place. I took the car out yesterday and was logging it and i noticed its got a nasty lean spike, from looking at the logs its a real sharp spike and the afr recovers the next frame which is in the same cell in the main ve table. Looking at the main ve table there isnt any major deformities or low spots in this area of the ve table. Now the car isnt tuned all the way but it is not off by far. Is this a VE issue or should I be looking else where?

*EDIT* This is a boosted COS3 With no maf and no PE

[joecar]

Looks like an intermittent air leak, maybe, coincides with MAP increase... check for loose hose or MAF bellows/duct.


For boost, that looks generally lean, I would expect to see AFR ~11.5 above 100 kPa.

[cyipher]

Joecar this is mafless application but i will check for boost leaks tonight. above 100 kpa i believe i command 11.8

[joecar]

Ah, ok, MAF-less.

The 2nd pic shows wideband AFR being about 12.35 above 105 kPa...

[cyipher]

Yes i still need to knock down the afr slightly, but still being mafless you think its still a vac leak?

[joecar]

I'm not sure that it's an airleak...

post tune file and a log file.

[joecar]

Also, you can link the scantool chart cursor to table cell highlighting in the tunetool...

in tunetool go Edit->Properties->Scanner and under PID Data Links checkmark both items.


So at the lean spike, you can look to see the current cell in each of the tunetool tables

[cyipher]

Wow i didnt know about the second check mark for data links! thanks!

Turns out i had a massive boost leak, it was before the tb so im guessing i was in a part of the map that was never used before because i was always in boost by then.

Also i know youve covered this before but the tune tool doesnt wanna follow the scan tool map pid, I went into to the tune tool and told it that it was metric instead of imperal and that fixed it but i log via bbx and is that a change going to have to be done every time? or can bbx set the pid to metric in the options.txt file?

[joecar]

Telling the V7 tunetool that the table axis is Metric (kPa) and the V7 scantool that the pid is Metric (kPa) should be permanent.