Hot start throttle hang
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From: San Jose, CA
Hot start throttle hang
hi guys. Whenever I hot start my car, the throttle always seems to hang for 1 sec when shifting. It wont do it if the car is warmed up from a cold start. Ideas?
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Joined: Sep 2015
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From: San Jose, CA
Update. That helped with inital startup. But when I am driving the car there is still throttle hang after a hot start. This started happening after the skunk 2 tb install. And yes, I already re-drilled the throttle spring hole. 
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Okay, maybe don't drill it again. Ensure your throttle cable is not kinky and that there is nothing in the way of wiring harnesses or insulation interfering with the cable inside the firewall.
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Wouldn't decreasing IAC initial values table in affected cells help this? Presumably the top row where you're highest CLT/IAT numbers are.
*Sorry if that's a dumb suggestion. I suck at idle tuning and I'm still trying to grasp how everything works together.*
*Sorry if that's a dumb suggestion. I suck at idle tuning and I'm still trying to grasp how everything works together.*
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From: San Jose, CA
wouldnt help. It’s not an idle thing. It does it between shifts.
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$20 says a datalog will show it's not actually in closed-loop idle mode when it hangs. The valve hangs open because the RPM is outside the bounds where CL idle can activate, and so it hangs there forever. Blip the throttle and the revs will drop on the way down, CL will activate, and it will come down to a normal idle.
Reduce the max idle DC% or reduce the hot idle initial duty cycle.
Reduce the max idle DC% or reduce the hot idle initial duty cycle.
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From: San Jose, CA
It will come down to idle rpm every time. Its just when shifting, the RPMs dont drop when clutch is depressed. it hangs for .5-1 sec before dropping down. Its not an idle issue.
Last edited by icantlearn; Apr 26, 2018 at 12:36 AM.
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