Erratic idle with A/C on

2002yukon · Post by **2002yukon** » Fri Jul 12, 2013 4:18 pm

I have a 2002 Yukon Denali. The idle sits at about 400-500 RPM with the A/C on while in park and in drive. I have tried increasing the RMP up with the tuner (currently +250 RPM) but it makes no difference. That low of an RPM isn't enough to get cold air from the vents. It seems to jump around a bit, sometimes going up to 750 RPM, but it than drops down to about 350 before settling in at about 450 RPM.

Post by **mikel** » Fri Jul 12, 2013 5:05 pm

are you adjusting the idle/AC on setting?

2002yukon · Post by **2002yukon** » Mon Jul 15, 2013 1:20 pm

Yes, adjusted the AC on setting, also upped the AC off idle as well and adjusted both park and drive idle. AC off idle works perfect. I forgot to say it's the 6.0L Vortec GM engine. I have gone over 200 miles since the last tune and it's still doing it.

UARPerformance · Post by **UARPerformance** » Tue Jul 16, 2013 11:29 pm

I thought there was a reflash for that. Try cleaning throttle body & doing induction service. If throttle blade is at max percentage of throttle allowed for idle. it wont let it go any further for fear of A runaway condition. I don't think it allows more than 15 %

2002yukon · Post by **2002yukon** » Wed Jul 17, 2013 6:53 am

There is no issue with my throttle body itself. This problem didn't start until I used this programmer.

Post by **mikel** » Wed Jul 17, 2013 11:35 am

goes back to normal with the stock tune?

2002yukon · Post by **2002yukon** » Wed Jul 17, 2013 11:48 am

Yes, when I return to stock, it works as it should.

Post by **mikel** » Wed Jul 17, 2013 1:18 pm

load the tune and post the last tune written and the backup files please.

Erratic idle with A/C on

Erratic idle with A/C on

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