Tephra Rom ignoring "Closed-Loop, Min Coolant Temp"?
Sep 6, 2014, 06:15 PM
#1
Tephra Rom ignoring "Closed-Loop, Min Coolant Temp"?
Hey guys,
I seem to have a problem in my Tephra Rom that causes it to ignore this parameter.
It doesn't seem to matter what the value is.
I know it's not working because if I use the Open-Loop load and throttle thresholds instead, I can force open-loop at startup.
Rom=88590715
Address=14aa
Scaling:
Name=Temp
Format=%.0f
units=Fahrenheit
(9/5)*(x-40)+32
(5/9)*(x-32)+40
Data Type=uint16
Any ideas?
I seem to have a problem in my Tephra Rom that causes it to ignore this parameter.
It doesn't seem to matter what the value is.
I know it's not working because if I use the Open-Loop load and throttle thresholds instead, I can force open-loop at startup.
Rom=88590715
Address=14aa
Scaling:
Name=Temp
Format=%.0f
units=Fahrenheit
(9/5)*(x-40)+32
(5/9)*(x-32)+40
Data Type=uint16
Any ideas?
Sep 15, 2014, 08:49 PM
#7
Evolved Member
what sort of value were you thinking of using?
20*C to 35*C is the optimum range for this parameter.
Higher and you can run needlessly rich, lower and you start screwing with your fuel trim learned value (needlessly).
Note also there is a Post-Startup Closed-Loop Delay table (or two) that factors into the closed loop function.
20*C to 35*C is the optimum range for this parameter.
Higher and you can run needlessly rich, lower and you start screwing with your fuel trim learned value (needlessly).
Note also there is a Post-Startup Closed-Loop Delay table (or two) that factors into the closed loop function.
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Sep 16, 2014, 09:26 AM
#10
what sort of value were you thinking of using?
20*C to 35*C is the optimum range for this parameter.
Higher and you can run needlessly rich, lower and you start screwing with your fuel trim learned value (needlessly).
Note also there is a Post-Startup Closed-Loop Delay table (or two) that factors into the closed loop function.
20*C to 35*C is the optimum range for this parameter.
Higher and you can run needlessly rich, lower and you start screwing with your fuel trim learned value (needlessly).
Note also there is a Post-Startup Closed-Loop Delay table (or two) that factors into the closed loop function.
Car starts and runs fine for the first 20 secs and then starts leaning out anytime the Coolant temp is below 60f... once coolant temps rise the car runs perfect. .. literally a 2 to 3 minute inconvenience in my daily commute. not that big of a deal really.
Could you provide the defs for the two tables you mention?
Last edited by tsitalon1; Sep 16, 2014 at 09:31 AM.
Sep 16, 2014, 02:22 PM
#12
Evolved Member
tsi, just increase the warmup table values a bit in the affected area, should solve the lean condition thru that temp range.
I have found this necessary on e85 cars.
I have found this necessary on e85 cars.
Sep 17, 2014, 03:01 PM
#15
Evolved Member
^ it is some sort of weird ISC control inhibit timer, and may not even be called in 8859, as I suspect it has to do with SAS (anti-lag).
the stock value (in most roms) is 0x0050
the stock value (in most roms) is 0x0050
