a/c and idle help needed
05-10-2006, 01:08 PM
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a/c and idle help needed Not sure if this is in the right area, but maybe. I have a 98 t/a with an f11 cam and tuned with ls1 edit. Besides it being a bit rich, whenever i turn on the a/c at idle, the car dies. Anything above idle, the a/c works great. I dont have the program to see if there is a spot to increase idle when a/c is on. Could that be the problem? Or maybe an electrical connection, not telling the car to speed up idle? 
05-10-2006, 01:16 PM
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There are some A/C accessory load params / tables
that should bump up the idle airflow and maybe spark
too. I don't know what these are called or if they are
available in Edit. Probably the idle is so weak (large
cam) that it can't ride out the "sag" when the A/C kicks
on. This could be more about the idle airflow values and
idle learning at the root of it all but if the rest is good
(no surging / stalling) then maybe you just want to
deal with the A/C-specific load issue at idle.
that should bump up the idle airflow and maybe spark
too. I don't know what these are called or if they are
available in Edit. Probably the idle is so weak (large
cam) that it can't ride out the "sag" when the A/C kicks
on. This could be more about the idle airflow values and
idle learning at the root of it all but if the rest is good
(no surging / stalling) then maybe you just want to
deal with the A/C-specific load issue at idle.
05-10-2006, 01:20 PM
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Originally Posted by up2nuthingud
Not sure if this is in the right area, but maybe. I have a 98 t/a with an f11 cam and tuned with ls1 edit. Besides it being a bit rich, whenever i turn on the a/c at idle, the car dies. Anything above idle, the a/c works great. I dont have the program to see if there is a spot to increase idle when a/c is on. Could that be the problem? Or maybe an electrical connection, not telling the car to speed up idle?
I hope you're not going by just exhaust smell to determine rich/lean.
What kind of fuel trims are you seeing at idle?
05-10-2006, 01:24 PM
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i am basing my guess at rich idle based on the black smoke you can BARELY see coming out as it sits idling. i dont know about the tables, as i had someone else do the tune.
05-10-2006, 01:26 PM
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Originally Posted by up2nuthingud
i am basing my guess at rich idle based on the black smoke you can BARELY see coming out as it sits idling. i dont know about the tables, as i had someone else do the tune.
All you need is a good scanner to read the fuel trims.
Or you could just hook up a wideband.
05-10-2006, 01:47 PM
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Originally Posted by up2nuthingud
lean misfires? i am afraid i dont know much about that. i will see if i can get a scanner and check the trims.
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05-10-2006, 01:56 PM
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i may take you up on that. my buddy just quit being our snap-on guy, so no more free access to expensive loaner tools! i will check a couple places, and let you know. thanks!
05-10-2006, 03:58 PM
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Originally Posted by up2nuthingud
i may take you up on that. my buddy just quit being our snap-on guy, so no more free access to expensive loaner tools! i will check a couple places, and let you know. thanks!
No problem. PM me if you need to use it.