What controls AC air/fuel?
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TECH Addict
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What controls AC air/fuel? Is there something else that controls air/fuel with the AC on? Or does the change just have to do with increased load on the engine? Or is there some table that would be beneficial in the future for us to be able to edit?
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I am not so much interested in the AC as I am in the fact that I think there is less surging with my AC on. I have been trying to decide where to change to eliminate surging, and I was just curious if it really did add IAC. Interesting...
TECH Addict
Joined: Oct 2003
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From: Central, MA
FWIW: In HPT for my '04 Silverado here, in regards to AC on / AC off variables, I only have the desired idle speed table. Nothing else. The TB is drive by wire.
I found it strange that both my AC on, and AC off idle speeds were the same. For the heck of it, I set the idle speed to be 50 rpm higher when my AC was on. All it did was confuse the truck when the compressor cycled. The engine idled pretty bad, and this is with an almost bone-stock motor. I set them back to the same RPM, and it idles great.
I found it strange that both my AC on, and AC off idle speeds were the same. For the heck of it, I set the idle speed to be 50 rpm higher when my AC was on. All it did was confuse the truck when the compressor cycled. The engine idled pretty bad, and this is with an almost bone-stock motor. I set them back to the same RPM, and it idles great.
FormerVendor
Joined: Jan 2003
Posts: 525
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From: Melbourne, Australia
we will be adding all the stuff i mentioned in my post on the IAC operation soon, as well as the ability to log these and other idle related things in the scanner that cannot be retrieved via normal PIDs.
There is no "AC on" fuel as such, just an idle airflow correction to open the IAC more to account for the extra load.
Chris...
There is no "AC on" fuel as such, just an idle airflow correction to open the IAC more to account for the extra load.
Chris...
