JoeDirt

Why is my car spiking lean all of a sudden. Im backing out of my driveway and LTFTS go from around +5 in cell 20 ( cold start idle ) to +25 lean both banks in cell 22 . . . which I beleive is With Open Throttle cell

Can I email someone some efilive V6 files to look at

Could this be an electrical connection ?? Sometimes the A/F ratio is doing pretty good and sometimes its spiked lean.

With open throttle o2's read steady 925 - 950 mvs

HumpinSS

iTrader: (1)

Check for a vacuum leak. Check thouroughly

JoeDirt

Is there anything at the back of the manifold that could cause this ??

I went over my headers and intake tract, even re torqued my manifold and cleaned my maf. I ruled out fuel pressure.

Heres what bothers me most . . . both banks ( left and right ) are even 90 % of the time so a header leak is most likely out of the question . .. but I retourqued them anyways.

That got me thinking manifold leak or similar that would be causing both banks to run equally lean. . .

When I was backing out of my driveway it spikes +25 when I dropped the nose off the curb. Probably just coincidence as it also switched cells at the same time. WTF am i in a WOT cell in reverse

JoeDirt

Here are some screen shots , Id tried to show how it just switches
from running pretty good to going +25.


Heres the first one ,
Im backingout of my driveway



As I come off the curd still backing up BAM + 25



Here are some more showing how
it just switches itself from running normally to spazzing +25





And a couple more




Anybody that knows anything about cells please chime in

P Mack

iTrader: (6)

Well I know exactly why it's switching to cell 22, and it's not random. Whenever you cross the throttle position threshold for idle, i think it's like 1.8% or somethign, and the car is still warming up (open loop) it always goes to cell 22. Just look at what your throttle does when it switches cells. As for why your ltrims are +25 in that cell, i have no idea.

JoeDirt

Good info . Does it also do it after it has warmed up . . .it seems to go cell 22 all the time when cruising too.

How long will old LTFT's effect things ? Minutes / Hours / Days ?? If I did have an exhaust leak or intake leak before and fixed it would it clean up right away or take a while ??

Thanks for your help

HumpinSS

iTrader: (1)

How old are those o2 sensors. They dont seem to have to much activity on them

JoeDirt

About 20 000 km on them. I did the efilive check and everything checked out. .. I dont know why there not bouncing there


Usually they look like this . They usually only go smooth like that at WOT I think





But sometimes there all fucked up like this