MS3x tuning issue 1.6 turbo
 

good afternoon all,

thanks for the previous help all.
i am having a new issue. car leans out as soon as i press the gas. goes from 14.5(ish) to 19-20 afr for 1-2 seconds then goes back to 13-14 afr and stays there but goes up and down on the afr.same goes with highway cruising, moment i press the gas, it leans out then richens up again.

1993 1.6 california emissions. turbo is garrett gt2871 with a 38mm tial ewg, begi manifold, begi fmic with piping, gm ait, mitsubishi bov, 1.8 red injectors with new seals, custom downpipe, fuji exhaust, speed3 resonator,bmw VTPS, Defi fuel pressure gauge, innovative mtx-l wideband wired to stock harness, innovative boost gauge, has the isv stillspec stg 2+ clutch(recently installed), i added two more grounds. 1 to the head and 1 to the block.
i built the ms3x with trubokitty instructions. i am using the vacuum line from the back of the intake manifold. recently did that, no changes.
i reverted back to other tunes and still has the same issue.

install vTPS.

tune accel-pump.

thank you for reminding me. i have the bmw vtps

screen shots of the tuning via time based

Use Accel pump, turn off eae for now. Tune

ive gone from both, back and forth. tried and still the car's acting the same. :(

will continue mañana.
thank you for your inputs

did you start with my basemap?


offtopic: how do you plan to actually boost with your current injectors?

i have ev14's standing by but i want to be able to get the car to start off right and then slap on the bigger injectors.

with your basemap the car starts and shuts off right after.

and im also tuning on a MAC. i purchased the tunerstudio w hile back.

I'd at least copy the accel pump settings out of it. remember to move the slider to about 80-90% tps.

i uploaded the tune on trubokitty and adjusted parameters such as injector size, trigger wheel, accel pump -> 80/85/90%tps.
it starts, idles for 4-6 seconds then leans out slowly, even when pumping the throttle a bit it continues to lean out.
i put 2 more grounds yesterday because maybe the grounds were weak, but doesnt seem to have done anything.
not sure if the %'s are supposed to look like that while the car is off and no throttle applied(picture attached).
is there too much interference?

this is the tune that the car had before and it ides and starts just fine. just when you press the throttle, it leans out.(same happened with trubokitty one).
with this tune it leans out then richens up again after a few seconds
so this picture shows how crazy the afr's go while i held the gas pedal but was NOT moving it up and down. this is all the car's doing.

your TPS is very noisy.

how do i fix this?

well, i cant actually tell if that's from you "holding" it like you said, the first log is clean, and you can lower your thresholds significantly.

here's a question, did you wire your car up for sequential injection? 93 CA models are wired like a 94 in regards to fuel...

my settings are set to fully sequential thanks to cali model.
ive been messing with the settings and it has 'less' delay but the lean issue persists.
ill hold the throttle even if its very slightly and it'll lean out then richen up after its lean.

im also reading a thread on how to fix the noisy vtps.

but did you wire in inj c and inj d to the harness?

if you hold the throttle and it leans out, the fuel map needs tuning.

i did what i saw on trubokitty. said it needed the two extra wires and i put them in. i did nothing to the stock harness.
new issue just arose. i leaned out the ve table because it was around low 50's at the bottom right corner and put them at 25. car was idling at 10afr's. but it never did this before. but now its going from 10.8 and creeping to lean. adds xx.1 afr every few seconds until it reaches 15's then leans out faster.
fuck this is a headache!
when the fan kicks on, it nearly dies from afr's(19-20) rpm is maybe like 150, then i gas it then it comes back to life. i have isv off. lean issue persists on both accelerate and holding, and creeping afr.
as for the leaning out while accelerating. i accelerate, it leans out(while still accelerating), then jumps back into richer afr which are the afr tagets/ fuel ve table.

something else...

as the afr's creep up, the noise gets louder. its weird, sometimes the noise is gone and others the noise is crazy
if i accelerate, the noise is virtually gone and its a straight line other than the accelerated point. for both map and tps they get loud.

on a similar/different note... im looking at the vac/boost gauge on tuner studio and it creeps. its no where as fast as a gauge. its supper slow.

the iat is located right under the bov on the begi fmic piping.

as im holding the throttle after its lean tantrum, its rich.

my site doesn't really address 93 CA models.

i have a feeling you're only running on (2) cylinders right now.

for a 93 CA model you must wire fuel like the following:
INJ A - 2U
INJ B - 2Y
INJ C - 2Z
INJ D - 2V


if you use output test mode, do can you activate INJ C and/or INJ D?

thats all done and the car wouldnt actually idle nicely.
local guy had the same and didnt wire in the two extras idled lie shit and afr's stayed at 20-24.

can you post your tune and a log file?

no, your'e right it mustve been another site. but i did add the extra 2 wires.

first log is long. 2nd i tried to show the creeping more and the accelerating lean out issue. and 3rd i got the load of the fans to shut the car off.

and number 5(i know i skipped 4)... i started the car, no throttle used to start.

put in new sensor for wideband. still no change

continued logs
 

these are datalogs i took today.
so i ended up downloading both 90-93 and 94-97 trubokitty tunes. i bought a windows based laptop to see if there are any differences with the mac and windows.
the 94 tune works just fine and i adjusted what was needed such as timing and injectors and cc's for motor.
the wizard is -3.8* for timing.
injectors red top oem nb.
adjusted the tps afr and ait coolant sensor as well.
still gives me the same issue of going lean for seconds then pig rich and remains rich. i was autotuning so it was as pig rich while boosted.
it never read lean when i was boosting WOT.
ewg is setup around 9psi max.so starts to open around 6psi.

last file is zipped so unzip on your computer and its a log.
"94miatatunecalm" is the tune itself.
thanks for your time for all that look into this.