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Old 12-03-2019, 07:24 AM   #1
j_ros94
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Idle rpm drop

I heard its normal if ac is on and the idle rpm drop but mine drops if i just turn the fan on for the heat. Is this normal too?

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Old 12-03-2019, 07:33 AM   #2
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Stock tune is often pretty unstable during idle
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Old 12-03-2019, 07:35 AM   #3
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Stock tune is often pretty unstable during idle
Im boosted and tuned so i was wondering if that could cause my idle rpm to drop with the fan on

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Old 12-03-2019, 07:55 AM   #4
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Does it do like that just lately?
Best would be an idle log
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Old 12-03-2019, 07:57 AM   #5
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Does it do like that just lately?
Best would be an idle log
No its been doing that since i installed it but they said its normal just needed confirmation since its winter and i need the heat. Lol dont want my car stalling on a red light cuz of it

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Old 12-03-2019, 08:16 AM   #6
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No its been doing that since i installed it but they said its normal just needed confirmation since its winter and i need the heat. Lol dont want my car stalling on a red light cuz of it

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manual or auto? Just blip the throttle if you feel like you're about to stall. It sounds like the problem is your tune or you have a vacuum leak. We need a log to make sure.
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Old 12-03-2019, 08:26 AM   #7
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manual or auto? Just blip the throttle if you feel like you're about to stall. It sounds like the problem is your tune or you have a vacuum leak. We need a log to make sure.
Manual. I wish it was my tune but sasha from on point says he doesnt see anything but ill record a log

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Old 12-03-2019, 10:36 AM   #8
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My stock 2013 does it as well.
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Old 12-03-2019, 11:27 AM   #9
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When you turn the fan on with defrost settings on the AC kicks in to dry the air even though it is on a warm setting. This gives you the normal small displacement engine drop in RPM. Perfectly normal. Try turning it onto just the floor settings and a bet you get no drop.
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Old 12-03-2019, 11:34 AM   #10
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When you turn the fan on with defrost settings on the AC kicks in to dry the air even though it is on a warm setting. This gives you the normal small displacement engine drop in RPM. Perfectly normal. Try turning it onto just the floor settings and a bet you get no drop.
Interesting ill try that next time

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Old 12-03-2019, 12:49 PM   #11
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My 2013 auto would dip every time I came to a stop, with ,or without ac on. In sport mode it was worse, since it would hold the downshift longer. If I came to a quick stop in sport, I could stall it.
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Old 12-03-2019, 12:58 PM   #12
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@Gunman I read people saying this all the time. I have a feeling there is a fault that isn't tripping a CEL.

Also for reference, when I had an ABS CEL / limp mode, my idle would dip and nearly stall anytime I would brake to a stop.
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Old 12-03-2019, 07:52 PM   #13
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custom tuned edelbrock, almost always a rock solid 900 rpm idle (obviously the tuner raised it). whats your "normal" idle?
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Old 12-03-2019, 08:05 PM   #14
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Quote:
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custom tuned edelbrock, almost always a rock solid 900 rpm idle (obviously the tuner raised it). whats your "normal" idle?
floats around 900 give or take 50

custom tuned jrsc
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