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Old 03-05-2012, 11:32 AM   #1
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Question Cold start - have to push throttle a bit to start - what MSQ change?

Hi,

my car doesn't want to start easily when it's cold outside (~5C/41F).
The car needs a little while to start - if I push the throttle a bit it starts immediately. So now I always have a little trouble to decide what to change in my MSQ.

Am I correct that I need a higher PWM idle cranking duty? (Because that is what I do by stepping on the throttle - let more air in? Please help me out here...

Thanks!
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Old 03-05-2012, 11:35 AM   #2
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think about what that means...you are needing more air when you start...so maybe your crnaking table is too rich at certain colder clt temps? maybe.
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Old 03-05-2012, 11:35 AM   #3
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Quote:
Originally Posted by Zaphod View Post
Am I correct that I need a higher PWM idle cranking duty? (Because that is what I do by stepping on the throttle - let more air in?
Yes, that should do it.
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Old 03-05-2012, 11:42 AM   #4
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or that.
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Old 03-05-2012, 11:49 AM   #5
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O.K. many ways going in the right direction... ;-)))
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Old 03-05-2012, 12:59 PM   #6
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look in your logs for your normal idle duty when the car starts from that temp and is running at high idle. start with that duty cycle and add 10% and enter it in your cranking duty.
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Old 03-05-2012, 01:47 PM   #7
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Quote:
Originally Posted by Zaphod View Post
Am I correct that I need a higher PWM idle cranking duty? (Because that is what I do by stepping on the throttle - let more air in? Please help me out here...
Sounds right to me. Check the CrankingDC under the "Idle Control". I've seen values ranging from 40-60 here.
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