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Idle speed w/AC on
I've got a 1984 Carerra, and when I turn on the A/C the idle speed drops to 800rpm from 880. I thought it should increase 50 rpm. Anyone have any insight? Thx.
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07-30-2009, 12:41 PM
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N-Gruppe doesn't exist
Join Date: Jun 2005
Location: *%@#ing GPS, where am I? Oh wait I see the Space Needle.
Posts: 4,394
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drops due to the load you just added
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Ted '70 911T 3.0L "SKIPPY" R-Gruppe #477 '73 914 2.0L SOLD bye bye "lil SMOKEY"  "Silence is Golden, but duct tape is SILVER.” other flat fours:'77 VWBus 2.0L & 2002 ImprezaTS 2.5L |
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07-30-2009, 01:25 PM
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Your turning a compressor hence lower RPM.
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Pete 79 911SC RoW "Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey |
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07-30-2009, 01:27 PM
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Registered
Join Date: May 2002
Location: St Louis
Posts: 4,211
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The AC compressor status goes to the DME. What it does with it??? Your guess is as good as mine.
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Rick 88 Cab |
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07-30-2009, 01:52 PM
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Member 911 Anonymous
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Yeap Normal.
Hey do you have a Chip Mod? 84 RPMs should be 780-800 RPMs. If chipped it should be 880.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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07-30-2009, 02:49 PM
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no chip mod, but I am about to order Sw chip. Ive done everything I possablly can do to get this engine running smooth at idle. All sensors are new or adjusted no vacume leaks, complete rebuild 5000 miles ago, valves adjusted. I figure that when the A/C is turned on that the DME will compensate with a higher RPM with the increase in load.
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07-31-2009, 06:43 AM
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1979 Porsche 911SC
Marble Grey
