FSTR/TA

iTrader: (49)

My car has been running great since I finally got HPTuners and with the help of some of you got my tune pretty good. AS of the past couple weeks we dropped in temp pretty good where I have been running in 70- weather. I say 70 cause it seems right along there somewhere maybe 60s. As of this change the car is running very rich at cruise and idle (tears to your eyes rich) and started the bucking and jerking at lower RPMS in higher gears. It also did this last year wehn the temps dropped. CAn't see anything in my logs that points to anything so I was thinking one of 2 things. Faulty coolant temp sensor? or air temp sensor although no codes. Or I'm thinking TPS cause I can see alot of cruising speeds the TPS is at 0.0? I imagine that could throw the whole map of the tune off bu improper scaling at improper times if that makes sense? The richness and bucking came the same time so I'm sure they are related and the TPS voltage at crusing speeds I think has been that way unknowingly. Maybe I should look at the tune in temps below 70 and see what's different that above 70? I have lost power due to the richness and the bucking is ignorant and unlivable!

FSTR/TA

iTrader: (49)

Anybody have advice on this? C'mon fellas yall have great knowledge to share!

the.palmetto

iTrader: (2)

What is your voltage at the MAF, Temp sensor, and O2 sensors? That will tell you what is going on. You should monitor their voltages with changes in throttle input and make sure they are within range. Your ECU may be running in limp mode from improper sensor input and not knowing what to do to compensate for temperature changes. Doing a volt test on the O2 sensors will show you roughly what your AFR is. Maybe check spark plugs? I'm having issues with that as well. Inspect a couple to see if there is any peppering on the porcelain from detonation or any fouling present.

WeathermanShawn

iTrader: (1)

I think you need to be more specific about the following:

1. What type of tune are you running (SD or MAF)?
2. What are the actual AFR's (wideband) that you are experiencing?
3. Are you running closed or open loop?
4. Are you getting a faulty TPS code?
5. What are your Trims (if running closed-loop)?
5. Can you post your log and tune?

There are a few idle parameters that could throw off your AFR during warm-up. Airflow, Commanded fuel etc. Normally with closed-loop everything Trims to ~14.7 AFR. A temperature change (ECT/IAT) normally only effects that period of time until your engine reaches the closed-loop enable tempearture (ECT).

I think if you can share your log and tune it will be easier to diagnose your problem. I am somehow guessing you are open-loop. Normally a temperature change like you are describing would not have that kind of effect.

Thanks.

..WeathermanShawn..

FSTR/TA

iTrader: (49)

tr230 tune 1.jpg.hpt
Having issues posting the logs for some reason but I could email them to ya! They are reading .jpg.hpt.jpg. and I can't cahnge it for some reason. The tune reads .jpg.hpt and works and just doesn't have the last repeat .jpg and I ain't no computer wiz.

jimmyblue

iTrader: (11)

I have observed that the IAT reading has what I think
is a disproportionate fueling effect (via some sort of
bogus air mass scaling). Cooler makes richer and more
than even (if it were even, you would have no skew w/
temp).

This might be telling you that, at idle / low cruise, the
charge bias function wants reshaped to embody more
ECT and less IAT. But that's a messy tedious thing.

Before you go there, be sure you believe the NB O2s'
behavior is proper. These can be sensitive to outside
air temps as that's where the headers shed the heat,
and cold weather can show a summertime-OK sensor's
weakness. If your wideband says you're pig rich but
the trims are jacked positive and the narrowbands are
sitting lean or really sluggish, chase that first.