Then change your ve values may be necessary?
There is afterstart enrichment and a decay rate parameter to look at?
If you watch the iac during this event and see it is at 0 or maxed out then you learn some info to help diagnose
Im not getting the engine to rev up at initial startup. My AFR is 14.0. I think that is my problem. When cold the engine should idle at 12.5 afr. My IAC is all the way open when cold but engine idle wont increase because its to lean. I will try an give it more fuel vs coolant temp.Why on Earth do you want that rpms that high by IAC alone after start?
Just curious.
I am happy with mine all year round going up to maybe 1200 or a little higher. Even in Winter.
??
Am I wrong? Then I have it around 800rpms by 150F coolant temp.
Ok, i see. I have always turn the key on for a few seconds to let the fuel pump prime before I start it. You are correct about the O2 sensor delay. I will check and see if and where I can change that. I know I got closed loop set to 90 degrees.The O2 sensor is not 100% correct right at start-up man.
It need a little time to heat up, and to burn off humidity that forms to read accurately.
I think my car ignores the o2 sensor for a certain duration after start-up....then it begins to use it in closed-loop after a while. I bet yours does too.
Ignore the O2 for the first 10-30 seconds of running, maybe even longer?
Yes, I understand you....but I think you are not understanding me.
The ECU only thinks the IAC is fully open. But it may not physically be fully open due to starting too fast.
How is this possible you may ask??
Because the FAST cycles the IAC motor to find a good known position....a "home position" to start counting from.
If you start car too fast, then you mess up this process and the value you are looking at on your PC may not actually be correct. Got it?
I fix CNC machines and 3d printers and work a lot with motion-control system and motors and 5hit like that for a living.
Of course, if your VE tables are way off around idle or other parameters/tables then you need to address that first
I think the IAC is somewhere around 70 before I start the car
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Ok. Thank youYou can set the start up iac position to anything within its range....but you want it to start of course! Lol
If you find a good number then it should start without playing with the pedal.
Maybe extreme cold or heat requires a little tweeking of something