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LS stalls when AC turns on
Wondering if anybody has come across this issue. Did an LS swap on my 69 camaro and when I kick the Vintage Air AC on the idle doesn’t bump up and it stalls. Any tips that can remedy this would be greatly appreciated.
Thanks Steve |
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If it's too high you will have to bump the idle screw on the throttle body until you can maintain a hot idle desired speed, and the IAC can close down so it'll actually function when you need it. If it's DBW then ignore everything I just typed lol. |
The bump up has to be tuned into the ecu, especially if its not a factory ecu. They sometimes provide a pigtail, but its not always turned on in the ecu. You can also over charge the ac system and put enough load on the compressor to kill the motor as well. Also make sure you have a large enough alternator to handle the amp spike when the fans kick on. That can also cause accessory load issues as several of the front drive kits out there only come with 140 amp alternator or less and that won't cut it.
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Thanks |
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Thanks guys! |
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I am having exact set up as yours with OEM PCM and Cammed LS6. The engine stalls and dies if I rev it when the vintage air AC is on. This happens when the AC clutch is engaged. The rpm drops below the desired rpm and stalls. In fact, sometimes when letting off the throttle and pressing the clutch to come to a stop, the rpm drops and engine dies even before coming to a dead stop |
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My IAC counts at operating temperature are around 59 or so. I have read the recommended counts for cammed engines should be between 40-60, so I am within range I guess. I have looked at the throttle follower decay/ delay rates, and the column axis was for vehicle speed not rpm. So I was not sure what needs to be adjusted. Because the issue I am having is at idle and while driving. I have seen some videos in youtube where they recommend to increase the timing from 0 to 400 rpm at spark tables( in park & drive) to be at 30 degrees as this would work as stall saver. I have just changed the timing but need to write the changes into my pcm and see how it goes |
Did you ever resolve this?
What scanner/software package are you using? I have a 72 el camino with a 2002 5.3L from a chevy Silverado. It has a 1998 camaro cam and intake manifold with 2002 LS6 camaro injectors. It sometimes stalls when coming to a stop. thanks |
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