So let's pretend I did something dumb and changed my idle screw. - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-23-2012, 07:02 AM   #1
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Default So let's pretend I did something dumb and changed my idle screw.

How can I determine a good place to set it while using MS? I'm still trying to learn how to set my idle and a few days ago I had the 'smart' idea of tweaking the screw slightly to increase my idle speed, then tweaked the VE table to bring the AFRs back where I wanted. Unfortunately at this point I've twisted the screw back and forth enough times while testing various other theories that I have no idea where it was when I still had the stock ECU in the car. Reinstalling the stock ECU would mean changing injectors again, and I don't really want to do that (dumb mistakes like this mean I get to learn new things).

I'm just going to be running PWM Warmup while trying to sort it out. Any ideas? Or should I just screw it all the way in then back it out a certain number of turns and do the rest via software?
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Old 02-23-2012, 07:25 AM   #2
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Set it to the factory 850rpm. What's the issue?

After that, tune your idle afr. This may effect your idle rpm. Adjust again. Repeat unil you have a good rpm and afr.
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Old 02-23-2012, 07:50 AM   #3
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Thanks,
I guess my concern comes from reading a few threads today where Braineack mentioned, on several separate occasions, not to mess with the screw. I've been reading threads here long enough to know that's a good indication not to do it.
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Old 02-24-2012, 04:57 PM   #4
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you're thinking about the wrong screw. there is the screw on the throttle linkage that controls how much the butterfly in the throttle body closes. don't touch that. the idle air screw is something that can be easily adjusted. no biggy
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