thedude411

iTrader: (1)

I'm in the process of getting my car to run better so I can one day pulley my TVS down.. I've notice my short and long trims are way out of whack. One of the 2 data displays on my interceptors usually reads -64.8 for short trims while the other data readout reads -10.5 to -20. I'm not sure why they read out different numbers. Both are bank 1. His happens while I am slowly driving around town. The two readouts both generally display around -12.5 on the highway. When I'm WOT it reads 0 which seems correct. Long trim is generally around -20.5...

What should I be looking for? Ives searched this forum and other forums and everyone is like **** tune... Which it might be since its trifecta. But I don't fully believe it's all the tunes fault.

The other thing I notice is my wideband is all over the place while normally driving. But fine while I am WOT or at idle. During normal driving it flutters between 14.6 and 16.8 in rapid succession. Like one second it will be 14.7 then the next its 16.1. And this is constant throttle with an engine load of around 31%

My roommate was saying look for boost leaks because of the weird fuel trims but before I go on the hunt for that I want to see if it could be anything else.

Mods: fully bolted (intake full exhaust cooling mods...) TVS on a stock pulley. 60's and 1 step colder plugs gapped to .032 I believe.

Cherry GT

LTFT's (long term fuel trims) should usually be -/+5%, -preferred.
STFT's really read -68 ?????? something wrong there.

LTFT should be 0 or very near 0 @ WOT.
wide band should bounce back and forth around 14.7 crusin around,
02 sensor doing its job of telling ECM.... too rich... too lean and on and on and on.

thedude411

iTrader: (1)

Ya I have my doubts about the -68. I think my interceptor might be messed. It's weird as I can have the upper and low readouts both on the short trims and one will read the -10 to -20 and the other one reads from 0 to -68.5

What are the limits it should bounce for AFR's around cruising. My roommates turbo mx-5 stays fairly close to 14.7 whereas mine is only there for a split second while it bounces back and fourth between 14.7 to 16.1.

blueLNFftw

iTrader: (16)

cruising should be in the 14's.


If your fuel trims are off that bad then you have some serious tune issues if they have always been like that. Have they or did this just start happening?

umrdyldo

iTrader: (1)

So no CELs or anything?

Can you view the voltage on the 02 sensor?

I would do the easy stuff first. Clean MAF, maybe change o2 sensors. Could also be EVAP, but I would think you would have codes.

thedude411

iTrader: (1)

No codes. It's always been running like this since I installed the TVS and got tuned. I can do some data logging next week.

yellowsupercharged06

iTrader: (3)

im going to say your tuner has no clue what he is doing

orrrrrrr you have a vac leak somewhere



AFR will never sit at 14.7 while cruising ... its going to fluctuate around but 14.7 - 15.5 is normal for cursing speeds.



if your interceptor is acting a fool make sure you have the correct STFT setup for your car look in the manual for the correct # code thing.

Log it with HPT and see what your twerkin wit.

Staged07SS

iTrader: (25)

How have u not thrown a code??

When you peg around 15-20 with your fuel trims, it will usually set a code. Odd.

blueLNFftw

iTrader: (16)

He cant.
Vince has parameters wither shut off or blocked. I tried logging a Trifecta tune with HPT.

Could have been shut off.
No way to tell because Trifecta.

Staged07SS

iTrader: (25)

yuk.... I hate when tuners shut off codes like that.

jp1600

iTrader: (2)

I'm supprised his trims will even go that far, I didn't think they had that much range, I'm going with a data error

blueLNFftw

iTrader: (16)

Ill set my aero to read trims for my quick drive home. I know what they should be because HPT. Ill let you know what parameter I use.

yellowsupercharged06

iTrader: (3)

why do you have a trifecta tuned LSJ ... Ca'Mon Man

thedude411

iTrader: (1)

I live in Canada and the car would still have to have been remote tuned. I have hpt sitting in my room but I need to buy a new laptop since I mainly use an iPad or a desktop. It's also winter so there's no point trying to tune it since I rarely drive it these days as I have a grand Cherokee as my winter vehicle.

I'm definitely thinking its a data error for the -60ish trim since it doesn't match the other readout on the interceptor.

blueLNFftw

iTrader: (16)

What are you trying to read the STFT with?
HPT?
Interceptor?

wayfarer

iTrader: (5)

my ltft was -20 when I started. much less now

thedude411

iTrader: (1)

Interceptor

blueLNFftw

iTrader: (16)

plug your HPT in and do a log.
post it up here.
you could have an issue with the interceptor.

I can email you a LSJ config file for the VCM Scanner if you PM me.