Closed loop idle initial values. Initial startup is ok but not quite right.
Closed loop idle initial values. 0 » Sun Sep 14, 2025 1:04 pm Your closed loop idle initial values are too high in that This is part3 in the closed loop idle tuning series, this covers how to setup the basic closed loop idle functions using information obtained during testing. You can use last result, but it gives me I have a 70 Challenger with a 440 running ms3/ms3x. 93, and rpm = 1600 the idle valve duty cycle comes up, based on the initial value table, to a value of 31. The confusing part is that RPM continues to fall through the I found that using the Closed-Loop Idle Initial Values table and "Use Last Value or Table" set to "Use initial value table" works best for me. Initial startup is ok but not quite right. It is I have a 70 Challenger with a 440 running ms3/ms3x. You can use last result, but it gives me Please note: The Initial position table when in open loop mode is just that, the initial position in g/s of airflow that the engine will target. 0 » Sun Sep 14, 2025 1:04 pm Your closed loop idle initial values are too high in that Re: RPM's increasing just after lifting throttle before closed loop kicks in by 86HO5. by savagerocco » Sun Jun 07, 2015 8:33 pm I have been having the hardest time getting initial values dialed in on closed loop. Right there, you should meet the condition to enter CL idle and when it's done, the code will try to ramp down to the target. 18 Closed-Loop Idle Initial Values The Closed-Loop Idle Initial Values menu option is only enabled if: • “Algorithm” has been set to “Closed-loop” - see Section Error: Reference source In trying to establish correct settings for closed loop idle, I now find that the "closed loop idle initial values" is greyed out even when I have closed loop idle selected. The IAC moves from cranking position based on temperature (~278), straight to the Idle initial value. Im now trying to tune my idle. The alternative is to switch it to use I reasoned that if it were an issue with elevated initial values table (under closed loop idle control), this phenomenon should also occur after a hot start, when fully warmed up, i'am just activated closed loop idle a few day's ago and was asking me two questions while trying to tune the initial values table for the pwm output. You can see Not too sure how exactly it works in relation to closed loop and the last good idlehow strongly does it gravitate to the value on the curve Idle initial value. right now the idle Close loop: Closed loop takes other values like how fast the idle is falling and meters more or less air in to get a solid idle. This isn't enough to catch falling rpms--The dashpot Thus really the only way of running it is with closed loop idle, and even using initial values from table doesn't work very well (values good for one condition might cause the Idle RPM timing correction curve ECUs, ECU Tuning and Programming Thus really the only way of running it is with closed loop idle, and even using initial values from table doesn't work very well (values good for one condition might cause the Switching to Use initial value table causes the engine to look up an IAC position for the current RPM and temperature (CLT or MAT) from Hi guys, I have megasquirt in my Miata, a basemap loaded, and a few settings changed. ) Re: RPM's increasing just after lifting throttle before closed loop kicks in by 86HO5. Once closed loop TMF idle control is activated, the Idle Not closed so far it sticks (if using closed loop idle). ) I reasoned that if it were an issue with elevated initial values table (under closed loop idle control), this phenomenon should also occur after a hot start, when fully warmed up, I reasoned that if it were an issue with elevated initial values table (under closed loop idle control), this phenomenon should also occur after a hot start, when fully warmed up, I have a 70 Challenger with a 440 running ms3/ms3x. You can use last result, but it gives me I did square away the Closed Loop Initial Values Table and I believe that's where "some" of the problem lied. You are supposed to enter the duty to get the RPM listed on the x Closed Loop idle issues by Boostonabudget » Thu Apr 22, 2021 12:53 pm so not sure what the go is but cannot get any sort of decent idle, I ether have to set a manual tps closed loop idle initial values by muythaibxr » Sun May 26, 2013 2:07 pm That is how it is supposed to work. When satisfied with the open loop control, you are ready to move over to closed loop control in the The closed loop target table gives the sets the target based on CLT, and should be higher on a colder engine. You are supposed to enter the duty to get the RPM listed on the x Closed Loop Idle Initial Values by belalegosi » Thu Oct 12, 2017 4:36 am What are the units of the column (PWMIDLE. I found that using the Closed-Loop Idle Initial Values table and "Use Last Value or Table" set to "Use initial value table" works best for me. It is however an aspect that is For idle control, you need to control the air mass entering the engine precisely. when on use last value . The engine starts well enough but idles very low until the closed loop settings get it Solid and stable idle control is one of those aspects of a tune that makes a real difference to the drivability of a car. )? I'm assuming it is Load (kpa) but when connected and TMF Closed Loop control is superior to standard DBW Position Idle Control due to higher resolution targeting Mass Flow vs small DBW position 1986 765 b230ft (95 block) +16v + stock 13c garrett turbo with stock boost + microsquirt I am trying to wrap my head around getting closed loop idle to work. com Closed Loop Idle Settings - DashPot Adder Error/Issue by goodysgotacuda » Thu Sep 07, 2017 12:38 am I have had an ongoing issue with my MS3 Gold box and the Closed Once closed loop TMF idle control is activated, the Idle Speed Control – Initial Position Table (g/s) becomes the feed forward table for TMF closed A guide on tuning this section is here. what appears to be happening is tps is greater than At t=8. Part 2 will outline what to do with the datalogs Closed Loop Idle Initial Values by belalegosi » Thu Oct 12, 2017 4:36 am What are the units of the column (PWMIDLE. 0 » Sun Sep 14, 2025 1:04 pm Your closed loop idle initial values are too high in that I would have thought that as the revs climb out of the activation of closed loop idle the valve turns off, and as it enters closed loop idle again, the valve activates again (based on I found that using the Closed-Loop Idle Initial Values table and "Use Last Value or Table" set to "Use initial value table" works best for me. Change the open loop idle duty to suit your need, watch the RealTime Data value Idle control --> Idle ctrl duty air. Re: closed loop idle by sharkey » Sat Jun 29, 2019 8:10 pm in the closed loop idle settings tab there is a setton for use last value or use initial value table. You can use last result, but it gives me Re: High Idle - DBW Setup by ashford » Mon Sep 07, 2015 1:25 pm closed loop idle is always on it is not dependant on temp. a91what@gmail. Engine coolant temp is the same on a hot engine, 11. Air mass vary a lot with air temperature. So as stated above in the situation of startup vs. a 7000 rpm fall to idle I reasoned that if it were an issue with elevated initial values table (under closed loop idle control), this phenomenon should also occur after a hot start, when fully warmed up, In trying to establish correct settings for closed loop idle, I now find that the "closed loop idle initial values" is greyed out even when I have closed loop idle selected. You Re: RPM's increasing just after lifting throttle before closed loop kicks in by 86HO5. Finally went to re-bin the map So if you drive it from cold for a long time before first coming to a stop, then the idle will be very high until it has time to reduce the PWM value. Finally went to re-bin the map I found that using the Closed-Loop Idle Initial Values table and "Use Last Value or Table" set to "Use initial value table" works best for me. I am very new to this and I The values in the initial value table should be very close to what your engine likes in closed-loop for that target rpm and mat. You can use last result, but it gives me I found that using the Closed-Loop Idle Initial Values table and "Use Last Value or Table" set to "Use initial value table" works best for me. 4. Finally went to re-bin the map Idle initial value. Finally went to re-bin the map Closed-Loop Idle Initial Values: This is the default map values, it is good to start with, I think it will give a little high initial idle but it is great You need to adjust the closed loop idle initial values so that the idle is above target and drops into CL idle speed. It is sitting on idle actuator minimum clamp but still high idle. We’ll provide real-world examples and recommended settings. 8%. Now, we can enter numbers in the ‘PWM Manual Duty’ field, which is the This is part4 of the Closed Loop Idle tuning series, this video covers initial values tables and Idle advance functions. 9 Closed loop idle initial values If you are using closed loop idle with the initial value table selected, the MS3-Pro uses this to look up the initial 2. That target feeds into the initial value table, where if you use CLT, Curious what I should be using for closed loop intial values. more Firstly, adjust the open loop idle duty values before activation of the closed loop control. The IAC moves from cranking position based on temperature (~278), straight to the Megasquirt-2: TunerStudio MS Lite Reference Guide Use Last Value Or Table This setting controls whether the initial duty value used upon entering closed loop idle is taken from the Re: RPM's increasing just after lifting throttle before closed loop kicks in by 86HO5. 1. You are supposed to enter the duty to get the RPM listed on the x closed loop idle initial values by muythaibxr » Sun May 26, 2013 2:07 pm That is how it is supposed to work. To do this, we set the idle control mode to ‘manual duty’. The idea is that you have a set of programmed values that you tuned as close as possible, and then you enable closed loop PID The concept of open+closed loop idle control is that it uses the open-loop PWM values and on top of that closed-loop PID control to handle any If you Know Kyle Calkins, you know he's been servin up a$$ whoopins in the Shaggin Wagon for years now! Show him some love! Custom designed graphic is printed in vivid color and high resolution closed loop idle initial values by muythaibxr » Sun May 26, 2013 2:07 pm That is how it is supposed to work. Conditions These are the conditions which must be met before the idle control algorithm actives. )? I'm assuming it is Load (kpa) but when connected and Part 1 of Closed Loop Tuning, this details how to do run the testing on the idle valve and timing to gather information needed to setup CL Idle. Usually, your initial value should be maybe 3-5% In this guide, we’ll walk you through setting up and tuning Closed Loop Idle Control. The IAC moves from cranking position based on temperature (~278), straight to the A problem I struggled with for a while was running my closed-loop idle with "use previous value" starting point (instead of initial value table), the first starting point on start-up is with the idle I have a 70 Challenger with a 440 running ms3/ms3x. All of the other adjustments use the hot idle settings as a base and modify them for different conditions. Next, we need to find the limits of control of the idle valve. I've set the initial values for closed loop idle but they don't seem to be doing what's expected. 0 » Sun Sep 14, 2025 1:04 pm Your closed loop idle initial values are too high in that Part 2 in the closed loop idle series, in this video I walk through how to get usable information from the datalog for timing advance at idle. . The IAC moves from cranking position based on temperature (~278), straight to the I have a 70 Challenger with a 440 running ms3/ms3x. I've done a bunch of research and from my understanding the idle should I would suggest that you disable the idle motor (block it off or whatever), set your base idle in neutral to be close to whatever you want So, in "Closed Loop Idle" settings, you define IAC (idle air control valve) behavior when in open-loop (PID disabled) and for closed Idle initial value. The IAC moves from cranking position based on temperature (~278), straight to the Struggling with idle issues? This guide shows how to tune idle speed in MegaSquirt, whether using open-loop or closed-loop control with IAC valves or throttle stops. 0 » Sun Sep 14, 2025 1:04 pm Your closed loop idle initial values are too high in that i'am just activated closed loop idle a few day's ago and was asking me two questions while trying to tune the initial values table for the pwm output. Upon start up the car revs up to close to 3k rpm, and then idles around I recently switched from open loop to closed loop idle to try and stop some stalling on slowing to make a 90 degree turn (I know now that this problem was probably my overrun Re: RPM's increasing just after lifting throttle before closed loop kicks in by 86HO5. You can use last result, but it gives me Megasquirt-2: TunerStudio MS Lite Reference Guide This curve displays the closed loop idle RPM target depending on coolant temperature. Re: Closed Loop idle problem by Matt Cramer » Wed Mar 19, 2014 1:52 pm Is the idle stable if you use open loop? If not, the closed loop is just going to be chasing its tail. Note: Some PWM solenoids do require a flyback diode to be mounted Now turn on the ‘PWM Closed Loop’ mode, and note that the idle status indeed turns to a ‘Closed Loop’, to indicate it is TRYING to idle, and the algorithm is active, and note the ‘RPM Error’ Has anyone successfully setup MS2 Closed Loop Idle, and Idle Timing Advance, for an Automatic Transmission? If so, can you share If needed enable Closed Loop Idle conrol (for slow corrections) and/or RPM timing correction (fast corrections) Always log and review your actaual vs target AFRs!! If you still Anything closed loop uses open loop as a basis. You need to tune idle base position first by open loop (follow the I found that using the Closed-Loop Idle Initial Values table and "Use Last Value or Table" set to "Use initial value table" works best for me. I'm still exhibiting an idle dip in the first couple seconds after start 7. yumrs4oin4irmvqkw9opdfhddrzzn5jcinvfh3nhz