cold weather idle
01-11-2010, 07:07 PM
#21
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couldn't tell ya. Thats part of the original ZPI tune. I never had a problem with stalling so I never bothered to open up and tinker with that part of the map. If you think its contributing to this cold start issue I will follow dezods sticky and change it up.
01-11-2010, 08:12 PM
#22
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Well the Emanage will clamp the MAF sensor value to ECU at all throttle positions below the value you entered as it considers the accel closed. and right now you have it at the max value of 10%. which means at 10% or less throttle youre running off of the values in that table and not what the maf actually sees. possibly leading to the issues with the car on the freeway at that 10-15% throttle id say. And also the hold time setting of 5 sec is maxed out in your tune meaning once the Emanage goes into this clamp mode it will wait 5 sec before returning to normal control.
I would def suggest lowering the TP value to what dezod specified because of this and also lowering that time or dwell setting cuz right now its holding you in clamped mode for 5 sec at a time. tell me, is that about how long the engine would run at 1500rpm idle before dying back down and stuttering, then pick back up and run ok for 5 sec?
I would def suggest lowering the TP value to what dezod specified because of this and also lowering that time or dwell setting cuz right now its holding you in clamped mode for 5 sec at a time. tell me, is that about how long the engine would run at 1500rpm idle before dying back down and stuttering, then pick back up and run ok for 5 sec?
01-11-2010, 10:11 PM
#23
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Well the Emanage will clamp the MAF sensor value to ECU at all throttle positions below the value you entered as it considers the accel closed. and right now you have it at the max value of 10%. which means at 10% or less throttle youre running off of the values in that table and not what the maf actually sees. possibly leading to the issues with the car on the freeway at that 10-15% throttle id say. And also the hold time setting of 5 sec is maxed out in your tune meaning once the Emanage goes into this clamp mode it will wait 5 sec before returning to normal control.
I would def suggest lowering the TP value to what dezod specified because of this and also lowering that time or dwell setting cuz right now its holding you in clamped mode for 5 sec at a time. tell me, is that about how long the engine would run at 1500rpm idle before dying back down and stuttering, then pick back up and run ok for 5 sec?
I would def suggest lowering the TP value to what dezod specified because of this and also lowering that time or dwell setting cuz right now its holding you in clamped mode for 5 sec at a time. tell me, is that about how long the engine would run at 1500rpm idle before dying back down and stuttering, then pick back up and run ok for 5 sec?
01-12-2010, 03:39 AM
#24
Your fuel trims have nothing to do with this since fuel trims are corrections made by the ECU during closed loop operation, AFTER, the engine has warmed up.
Your main fuel map probably does not have enough fuel in the cell that is related to the conditions you are experiencing.
The reason your engine runs better once it is warmed has to do with the ECU entering closed loop operation and your short and long term fuel trims correcting your fuel delivery in the areas where your main fuel map is incorrect. That and engines need heat to run properly.
Your main fuel map probably does not have enough fuel in the cell that is related to the conditions you are experiencing.
The reason your engine runs better once it is warmed has to do with the ECU entering closed loop operation and your short and long term fuel trims correcting your fuel delivery in the areas where your main fuel map is incorrect. That and engines need heat to run properly.
01-18-2010, 04:25 PM
#25
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Well I changed up the anti-stall settings. Didnt help much. during cold start the maf output is alot higher than normal, so when setting it for cold start it works great however soon as it warms up it wont idle. And if i set it for normal idle, it doesnt make any difference in cold start....grrr
01-19-2010, 03:09 PM
#27
Well I changed up the anti-stall settings. Didnt help much. during cold start the maf output is alot higher than normal, so when setting it for cold start it works great however soon as it warms up it wont idle. And if i set it for normal idle, it doesnt make any difference in cold start....grrr
01-19-2010, 10:42 PM
#29
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maf clamp is like 4.80, but I dont think that kicks in untill 3kish rpms (per ptunning because i was maxing it out)
In the airflow map the cells around my idle are -15 (been that way since my ZPI tune)
my anti-stall is 1.68ish (added 5% to normal idle at the time) i think, during cold start the maf output ranges between 2.5 and stall as it surges. during normal idle the maf output is around 1.5-1.7
Now if i set my anti-stall to like 2.3 it cold starts great, never stalls, however once its warm it will die at every stop i make. at 1.6 it idles fine while warm but i have the same cold start problem.
turbo is a MHI 20g, 550cc injectors.
01-20-2010, 01:57 PM
#31
maf clamp is like 4.80, but I dont think that kicks in untill 3kish rpms (per ptunning because i was maxing it out)
In the airflow map the cells around my idle are -15 (been that way since my ZPI tune)
my anti-stall is 1.68ish (added 5% to normal idle at the time) i think, during cold start the maf output ranges between 2.5 and stall as it surges. during normal idle the maf output is around 1.5-1.7
Now if i set my anti-stall to like 2.3 it cold starts great, never stalls, however once its warm it will die at every stop i make. at 1.6 it idles fine while warm but i have the same cold start problem.
turbo is a MHI 20g, 550cc injectors.
In the airflow map the cells around my idle are -15 (been that way since my ZPI tune)
my anti-stall is 1.68ish (added 5% to normal idle at the time) i think, during cold start the maf output ranges between 2.5 and stall as it surges. during normal idle the maf output is around 1.5-1.7
Now if i set my anti-stall to like 2.3 it cold starts great, never stalls, however once its warm it will die at every stop i make. at 1.6 it idles fine while warm but i have the same cold start problem.
turbo is a MHI 20g, 550cc injectors.
01-20-2010, 03:58 PM
#32
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01-20-2010, 04:36 PM
#33
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do you have access to a obdII scanner that has freeze frame? alot of them do and it shows you the stft & ltft it was on when the check engine light came on. it also tell you load, ignition, temp etc.
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