savethehair
Probationary Member
- 17
- 0
- May 22, 2018
-
Ann Arbor,
Michigan
Alright everybody, I have got my dsm still sitting in the garage after over a year and think I'm dang close to finishing it. However, there are a few more specifics that I'm getting hung up on before actually having be a somewhat reliable daily driver. Mostly just trying to figure out fuel trims. Some specifics about the vehicle;
'97 Eagle Talon TSi AWD 4G63
Block is completely stock (stock rods, pistons, cams, cam gears, etc.) w/ 130,000 miles on it
New eBay big 16g w/ stock o2 housing (internal gate w/ 15lb spring)
3.5" Straight pipe exhaust
Aeromotive AFPR, walbro 255 w/ pump rewire
A/C deleted, Cruise Control deleted, EGR system deleted, FIAV bypass plate
Blackbox ECU from a '98 GST w/ ceddy mods, evoscan, and a serial to usb to log wideband values (AEM wideband)
Stock 450cc injectors w/ stock MAF
The car will start up easily and then go pig rich. After taking a log I see that the o2 feedback trim goes straight to +25% and it triggers the p0171 CEL. I read in Merlin's evo ecuflash tuning guide that a maxed out STFT can cause this code. After about 2min 10sec of it being maxed at +25% it immediatly goes to+ 5% and will stay there for the rest of the log. Strangely, I'm not getting any data for any other trim, the Fuel Trim Mid, Fuel Trim High, and Fuel Trim Low just give the value of 0 for all data points even after letting it idle for 20+ minutes and after driving it for 30+ minutes. The car also will drive okay, with a rich afr between 11.3-12.3, but after driving for around 10 minutes at idle it will want to bog out from being too rich. The data from o2sensor and o2sensor rear stays at 0.03904 for the entirety of the log as well.
Attached is a log I took of the car idling for around 17minutes. Started the log right on cold startup. Displaying the non-values for the trims and the o2 feedback trimming going to 25 then 5.
I don't know if I'm just logging wrong, (ie using the wrong MUT definitions for the trims or wrong setup in evoscan) or if I have a hardware issue (bad rear o2 or front o2) or if my flashed tune is whack (although it's pretty much 100% stock). What steps can I take to identify what my issue is?
'97 Eagle Talon TSi AWD 4G63
Block is completely stock (stock rods, pistons, cams, cam gears, etc.) w/ 130,000 miles on it
New eBay big 16g w/ stock o2 housing (internal gate w/ 15lb spring)
3.5" Straight pipe exhaust
Aeromotive AFPR, walbro 255 w/ pump rewire
A/C deleted, Cruise Control deleted, EGR system deleted, FIAV bypass plate
Blackbox ECU from a '98 GST w/ ceddy mods, evoscan, and a serial to usb to log wideband values (AEM wideband)
Stock 450cc injectors w/ stock MAF
The car will start up easily and then go pig rich. After taking a log I see that the o2 feedback trim goes straight to +25% and it triggers the p0171 CEL. I read in Merlin's evo ecuflash tuning guide that a maxed out STFT can cause this code. After about 2min 10sec of it being maxed at +25% it immediatly goes to+ 5% and will stay there for the rest of the log. Strangely, I'm not getting any data for any other trim, the Fuel Trim Mid, Fuel Trim High, and Fuel Trim Low just give the value of 0 for all data points even after letting it idle for 20+ minutes and after driving it for 30+ minutes. The car also will drive okay, with a rich afr between 11.3-12.3, but after driving for around 10 minutes at idle it will want to bog out from being too rich. The data from o2sensor and o2sensor rear stays at 0.03904 for the entirety of the log as well.
Attached is a log I took of the car idling for around 17minutes. Started the log right on cold startup. Displaying the non-values for the trims and the o2 feedback trimming going to 25 then 5.
I don't know if I'm just logging wrong, (ie using the wrong MUT definitions for the trims or wrong setup in evoscan) or if I have a hardware issue (bad rear o2 or front o2) or if my flashed tune is whack (although it's pretty much 100% stock). What steps can I take to identify what my issue is?