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ECMlink Inconsistent fuel trims after having car dialed in

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fabian95tsi

15+ Year Contributor
66
2
Nov 9, 2007
dodge city, Kansas
). Any boost, vac, or exhaust leaks?
Boost leak tested 5psi above your max boost with no leaks? not since startup

2). Verified mechanical timing?yes

3). Verified base timing?yes

4). Ignition system
COP or Stock Coil:stock coil
Wire brand and Age:innovative lc1, sensor is 8 months old
Spark Plug brand, type and Gap:ngk r 7s gapped at .28

5). Motor health (Compression Test)
Cylinder 1:160
Cylinder 2:170
Cylinder 3:165
Cylinder 4:160

6). Performed basic throttle body adjustments?
Idle Switch:1g throttle body on 2g car
Throttle Cable:adjusted
TPS:.65v closed 5.00 wot
BISS:adjusted

7). Compression ratio stock

8). Any known bad sensors or brittle wiring?none that i know of

9). Any DTC/CEL codes?none

10). Electrical system
Car off (not running):11.9-12.4
Car running:13.5-14.0

11). Base fuel pressure and injector values
Base Fuel Pressure:43.0 with vacuum line off
Injector Size (cc/min):fic 1120

12). Properly calibrated and configured wideband sensor
Sensor Brand:innovative lc1
Calibration Date:nov 2015 when i replaced sensor

13). Type of fuel
Type:pump gas
Percent of Ethanol:91 oct

14). Watched ECMlink how-to videos?yes plenty



ok guys so i recently had my idle and cruise tune set, air fuels were steady around 14.7 during idle and cruise. All of a sudden while driving yesterday and coasting to a stop, the car goes rich, it started idling at 11.0 and the car was running rough, during this time i caught a log and noticed that my fuel trims were pegged and would not fluctuate. The only way i would get fuel trims to do anything would be to adjust deadtime. In these two logs my settings are the same. My original global fuel was 55.5 and deadtime 435. When the car started acting up i had to lower deadtime to 350 or so. Im providing two different logs, the first of when it idle perfect and the second is when the car went crazy on me. What i find confusing is that the car would all of a sudden go back to running good again and i would have to put my settings to what i had originally.
 

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