KR and LTFT fluctuating wildly

[04lss]

So i finally fixed all of my exhaust leaks, i put 80 miles on the car and hooked up the scanner.
The LTFT is moving around as fas as the STFT. To top that off i have 5* of KR at the top of of 2nd. But it was droping and spiking regardless of RPM like the computer was correcting. also smelled like like it was lean
it also gets into moods where it idles kind of rough then runs right.
Mods: 3.5 pulley, headers, 1.8 rockers, ported heads, tune open cone

any thoughts?

[Scottydoggs]

vac leaks, maf, do a crank learn for the hell of it.

[04lss]

How does one do a crank learn?

[Scottydoggs]

you have a tuner dont ya? dhp hp both do it.

or a aeroforce can as well.

[04lss]

I do, ill have to dig around in it, should i clean the MAF or just unplug and see if the trims straighten out?
my guess is vac leak do to the recent rebuild

[Scottydoggs]

id check for vac leaks, if you find nothing, then try the maf unplugged.


the crank learn cant hurt even if you have no code. mine smoothed out some from one.

[04lss]

So I sprayed the hose that connects the fuel reg and boost controller to the manifold as well as all of the vacune lines up top no change in idle the only other line I saw goes to the firewall a d aroubd the battery but idk where the end is anywhere else I should kd spray?

[Scottydoggs]

move the lines while spraying, spray the tb from all sides, the fat evap hose off the tb, the bbv, the bbs, the map. the evap purge. hit it all.

moving the lines can make a crack show its self.

[04lss]

Wouldnt the leak need to be somewhat severe to make my fuel trims refuse to set a trend?
LTFT simply refuses to set

[Scottydoggs]

vac leaks make em go pos numbers, like +16 is a good leak.

egr tube too. check that out.

[04lss]

i went for a 5 min drive just now with the MAF unpluged went from pos 40 to neg 20 in a few seconds.
The car decided to cut off in an intersection without the maf while i was turning

[Scottydoggs]

they dont like to run well maf unplugged. stalling is normal.

[04lss]

Still thinking Vac leak? wouldnt it just set a very rich LTFT and hold at it? What i dont get is why the LTFT wont stabalize

Edit: not trying to argue, it just doesnt make sense to me.

[Scottydoggs]

what a leak does, +16 at idle, normal while driving. let off the gas and coast shoots to +10 to 16 again

[04lss]

its going from +20 to -40 in a matter of seconds

[Scottydoggs]

what are you scanning with? most only show to +16 or so and -20. you sure your looking at the right thing?

[04lss]

what are you scanning with? most only show to +16 or so and -20. you sure your looking at the right thing?

Ive scanned with DHP and with torque im looking at LTFT and STFT

I can create a log file and upload it if that would help?

[04lss]

I have been up and down all the vacuum lines in the engine bay, ive used brake clean moved the lines around etc. I cant find any vacuum leak.
Could something in my tune be messed up causing the Trims to swing so wildly

[Scottydoggs]

sent ya a pm.